diff --git a/Lib/test/test_math.py b/Lib/test/test_math.py
new file mode 100644
index 0000000000..4c3cdfbb75
--- /dev/null
+++ b/Lib/test/test_math.py
@@ -0,0 +1,2190 @@
+
+# Python test set -- math module
+# XXXX Should not do tests around zero only
+
+from test.support import run_unittest, verbose#, requires_IEEE_754 # TODO: RUSTPYTHON, commented due to import error
+from test import support
+import unittest
+import itertools
+import decimal
+import math
+import os
+import platform
+import random
+import struct
+import sys
+
+
+eps = 1E-05
+NAN = float('nan')
+INF = float('inf')
+NINF = float('-inf')
+
+# TODO RustPython: float_info is so far not supported -> hard code for the moment
+# FLOAT_MAX = sys.float_info.max
+# FLOAT_MIN = sys.float_info.min
+FLOAT_MAX = 1.7976931348623157e+308
+FLOAT_MIN = 2.2250738585072014e-308
+
+# detect evidence of double-rounding: fsum is not always correctly
+# rounded on machines that suffer from double rounding.
+x, y = 1e16, 2.9999 # use temporary values to defeat peephole optimizer
+HAVE_DOUBLE_ROUNDING = (x + y == 1e16 + 4)
+
+# locate file with test values
+if __name__ == '__main__':
+    file = sys.argv[0]
+else:
+    file = __file__
+test_dir = os.path.dirname(file) or os.curdir
+math_testcases = os.path.join(test_dir, 'math_testcases.txt')
+test_file = os.path.join(test_dir, 'cmath_testcases.txt')
+
+
+def to_ulps(x):
+    """Convert a non-NaN float x to an integer, in such a way that
+    adjacent floats are converted to adjacent integers.  Then
+    abs(ulps(x) - ulps(y)) gives the difference in ulps between two
+    floats.
+    The results from this function will only make sense on platforms
+    where native doubles are represented in IEEE 754 binary64 format.
+    Note: 0.0 and -0.0 are converted to 0 and -1, respectively.
+    """
+    n = struct.unpack('<q', struct.pack('<d', x))[0]
+    if n < 0:
+        n = ~(n+2**63)
+    return n
+
+
+# Here's a pure Python version of the math.factorial algorithm, for
+# documentation and comparison purposes.
+#
+# Formula:
+#
+#   factorial(n) = factorial_odd_part(n) << (n - count_set_bits(n))
+#
+# where
+#
+#   factorial_odd_part(n) = product_{i >= 0} product_{0 < j <= n >> i; j odd} j
+#
+# The outer product above is an infinite product, but once i >= n.bit_length,
+# (n >> i) < 1 and the corresponding term of the product is empty.  So only the
+# finitely many terms for 0 <= i < n.bit_length() contribute anything.
+#
+# We iterate downwards from i == n.bit_length() - 1 to i == 0.  The inner
+# product in the formula above starts at 1 for i == n.bit_length(); for each i
+# < n.bit_length() we get the inner product for i from that for i + 1 by
+# multiplying by all j in {n >> i+1 < j <= n >> i; j odd}.  In Python terms,
+# this set is range((n >> i+1) + 1 | 1, (n >> i) + 1 | 1, 2).
+
+def count_set_bits(n):
+    """Number of '1' bits in binary expansion of a nonnnegative integer."""
+    return 1 + count_set_bits(n & n - 1) if n else 0
+
+def partial_product(start, stop):
+    """Product of integers in range(start, stop, 2), computed recursively.
+    start and stop should both be odd, with start <= stop.
+    """
+    numfactors = (stop - start) >> 1
+    if not numfactors:
+        return 1
+    elif numfactors == 1:
+        return start
+    else:
+        mid = (start + numfactors) | 1
+        return partial_product(start, mid) * partial_product(mid, stop)
+
+def py_factorial(n):
+    """Factorial of nonnegative integer n, via "Binary Split Factorial Formula"
+    described at http://www.luschny.de/math/factorial/binarysplitfact.html
+    """
+    inner = outer = 1
+    for i in reversed(range(n.bit_length())):
+        inner *= partial_product((n >> i + 1) + 1 | 1, (n >> i) + 1 | 1)
+        outer *= inner
+    return outer << (n - count_set_bits(n))
+
+def ulp_abs_check(expected, got, ulp_tol, abs_tol):
+    """Given finite floats `expected` and `got`, check that they're
+    approximately equal to within the given number of ulps or the
+    given absolute tolerance, whichever is bigger.
+    Returns None on success and an error message on failure.
+    """
+    ulp_error = abs(to_ulps(expected) - to_ulps(got))
+    abs_error = abs(expected - got)
+
+    # Succeed if either abs_error <= abs_tol or ulp_error <= ulp_tol.
+    if abs_error <= abs_tol or ulp_error <= ulp_tol:
+        return None
+    else:
+        fmt = ("error = {:.3g} ({:d} ulps); "
+               "permitted error = {:.3g} or {:d} ulps")
+        return fmt.format(abs_error, ulp_error, abs_tol, ulp_tol)
+
+def parse_mtestfile(fname):
+    """Parse a file with test values
+    -- starts a comment
+    blank lines, or lines containing only a comment, are ignored
+    other lines are expected to have the form
+      id fn arg -> expected [flag]*
+    """
+    with open(fname) as fp:
+        for line in fp:
+            # strip comments, and skip blank lines
+            if '--' in line:
+                line = line[:line.index('--')]
+            if not line.strip():
+                continue
+
+            lhs, rhs = line.split('->')
+            id, fn, arg = lhs.split()
+            rhs_pieces = rhs.split()
+            exp = rhs_pieces[0]
+            flags = rhs_pieces[1:]
+
+            yield (id, fn, float(arg), float(exp), flags)
+
+
+def parse_testfile(fname):
+    """Parse a file with test values
+    Empty lines or lines starting with -- are ignored
+    yields id, fn, arg_real, arg_imag, exp_real, exp_imag
+    """
+    with open(fname) as fp:
+        for line in fp:
+            # skip comment lines and blank lines
+            if line.startswith('--') or not line.strip():
+                continue
+
+            lhs, rhs = line.split('->')
+            id, fn, arg_real, arg_imag = lhs.split()
+            rhs_pieces = rhs.split()
+            exp_real, exp_imag = rhs_pieces[0], rhs_pieces[1]
+            flags = rhs_pieces[2:]
+
+            yield (id, fn,
+                   float(arg_real), float(arg_imag),
+                   float(exp_real), float(exp_imag),
+                   flags)
+
+
+def result_check(expected, got, ulp_tol=5, abs_tol=0.0):
+    # Common logic of MathTests.(ftest, test_testcases, test_mtestcases)
+    """Compare arguments expected and got, as floats, if either
+    is a float, using a tolerance expressed in multiples of
+    ulp(expected) or absolutely (if given and greater).
+    As a convenience, when neither argument is a float, and for
+    non-finite floats, exact equality is demanded. Also, nan==nan
+    as far as this function is concerned.
+    Returns None on success and an error message on failure.
+    """
+
+    # Check exactly equal (applies also to strings representing exceptions)
+    if got == expected:
+        return None
+
+    failure = "not equal"
+
+    # Turn mixed float and int comparison (e.g. floor()) to all-float
+    if isinstance(expected, float) and isinstance(got, int):
+        got = float(got)
+    elif isinstance(got, float) and isinstance(expected, int):
+        expected = float(expected)
+
+    if isinstance(expected, float) and isinstance(got, float):
+        if math.isnan(expected) and math.isnan(got):
+            # Pass, since both nan
+            failure = None
+        elif math.isinf(expected) or math.isinf(got):
+            # We already know they're not equal, drop through to failure
+            pass
+        else:
+            # Both are finite floats (now). Are they close enough?
+            failure = ulp_abs_check(expected, got, ulp_tol, abs_tol)
+
+    # arguments are not equal, and if numeric, are too far apart
+    if failure is not None:
+        fail_fmt = "expected {!r}, got {!r}"
+        fail_msg = fail_fmt.format(expected, got)
+        fail_msg += ' ({})'.format(failure)
+        return fail_msg
+    else:
+        return None
+
+class FloatLike:
+    def __init__(self, value):
+        self.value = value
+
+    def __float__(self):
+        return self.value
+
+class IntSubclass(int):
+    pass
+
+# Class providing an __index__ method.
+class MyIndexable(object):
+    def __init__(self, value):
+        self.value = value
+
+    def __index__(self):
+        return self.value
+
+class MathTests(unittest.TestCase):
+
+    def ftest(self, name, got, expected, ulp_tol=5, abs_tol=0.0):
+        """Compare arguments expected and got, as floats, if either
+        is a float, using a tolerance expressed in multiples of
+        ulp(expected) or absolutely, whichever is greater.
+        As a convenience, when neither argument is a float, and for
+        non-finite floats, exact equality is demanded. Also, nan==nan
+        in this function.
+        """
+        failure = result_check(expected, got, ulp_tol, abs_tol)
+        if failure is not None:
+            self.fail("{}: {}".format(name, failure))
+
+    def testConstants(self):
+        # Ref: Abramowitz & Stegun (Dover, 1965)
+        self.ftest('pi', math.pi, 3.141592653589793238462643)
+        self.ftest('e', math.e, 2.718281828459045235360287)
+        self.assertEqual(math.tau, 2*math.pi)
+
+    @unittest.skip('RustPython')
+    def testAcos(self):
+        self.assertRaises(TypeError, math.acos)
+        self.ftest('acos(-1)', math.acos(-1), math.pi)
+        self.ftest('acos(0)', math.acos(0), math.pi/2)
+        self.ftest('acos(1)', math.acos(1), 0)
+        self.assertRaises(ValueError, math.acos, INF)
+        self.assertRaises(ValueError, math.acos, NINF)
+        self.assertRaises(ValueError, math.acos, 1 + eps)
+        self.assertRaises(ValueError, math.acos, -1 - eps)
+        self.assertTrue(math.isnan(math.acos(NAN)))
+
+    @unittest.skip('RustPython')
+    def testAcosh(self):
+        self.assertRaises(TypeError, math.acosh)
+        self.ftest('acosh(1)', math.acosh(1), 0)
+        self.ftest('acosh(2)', math.acosh(2), 1.3169578969248168)
+        self.assertRaises(ValueError, math.acosh, 0)
+        self.assertRaises(ValueError, math.acosh, -1)
+        self.assertEqual(math.acosh(INF), INF)
+        self.assertRaises(ValueError, math.acosh, NINF)
+        self.assertTrue(math.isnan(math.acosh(NAN)))
+
+    @unittest.skip('RustPython')
+    def testAsin(self):
+        self.assertRaises(TypeError, math.asin)
+        self.ftest('asin(-1)', math.asin(-1), -math.pi/2)
+        self.ftest('asin(0)', math.asin(0), 0)
+        self.ftest('asin(1)', math.asin(1), math.pi/2)
+        self.assertRaises(ValueError, math.asin, INF)
+        self.assertRaises(ValueError, math.asin, NINF)
+        self.assertRaises(ValueError, math.asin, 1 + eps)
+        self.assertRaises(ValueError, math.asin, -1 - eps)
+        self.assertTrue(math.isnan(math.asin(NAN)))
+
+    def testAsinh(self):
+        self.assertRaises(TypeError, math.asinh)
+        self.ftest('asinh(0)', math.asinh(0), 0)
+        self.ftest('asinh(1)', math.asinh(1), 0.88137358701954305)
+        self.ftest('asinh(-1)', math.asinh(-1), -0.88137358701954305)
+        self.assertEqual(math.asinh(INF), INF)
+        self.assertEqual(math.asinh(NINF), NINF)
+        self.assertTrue(math.isnan(math.asinh(NAN)))
+
+    def testAtan(self):
+        self.assertRaises(TypeError, math.atan)
+        self.ftest('atan(-1)', math.atan(-1), -math.pi/4)
+        self.ftest('atan(0)', math.atan(0), 0)
+        self.ftest('atan(1)', math.atan(1), math.pi/4)
+        self.ftest('atan(inf)', math.atan(INF), math.pi/2)
+        self.ftest('atan(-inf)', math.atan(NINF), -math.pi/2)
+        self.assertTrue(math.isnan(math.atan(NAN)))
+
+    @unittest.skip('RustPython')
+    def testAtanh(self):
+        self.assertRaises(TypeError, math.atan)
+        self.ftest('atanh(0)', math.atanh(0), 0)
+        self.ftest('atanh(0.5)', math.atanh(0.5), 0.54930614433405489)
+        self.ftest('atanh(-0.5)', math.atanh(-0.5), -0.54930614433405489)
+        self.assertRaises(ValueError, math.atanh, 1)
+        self.assertRaises(ValueError, math.atanh, -1)
+        self.assertRaises(ValueError, math.atanh, INF)
+        self.assertRaises(ValueError, math.atanh, NINF)
+        self.assertTrue(math.isnan(math.atanh(NAN)))
+
+    def testAtan2(self):
+        self.assertRaises(TypeError, math.atan2)
+        self.ftest('atan2(-1, 0)', math.atan2(-1, 0), -math.pi/2)
+        self.ftest('atan2(-1, 1)', math.atan2(-1, 1), -math.pi/4)
+        self.ftest('atan2(0, 1)', math.atan2(0, 1), 0)
+        self.ftest('atan2(1, 1)', math.atan2(1, 1), math.pi/4)
+        self.ftest('atan2(1, 0)', math.atan2(1, 0), math.pi/2)
+
+        # math.atan2(0, x)
+        self.ftest('atan2(0., -inf)', math.atan2(0., NINF), math.pi)
+        self.ftest('atan2(0., -2.3)', math.atan2(0., -2.3), math.pi)
+        self.ftest('atan2(0., -0.)', math.atan2(0., -0.), math.pi)
+        self.assertEqual(math.atan2(0., 0.), 0.)
+        self.assertEqual(math.atan2(0., 2.3), 0.)
+        self.assertEqual(math.atan2(0., INF), 0.)
+        self.assertTrue(math.isnan(math.atan2(0., NAN)))
+        # math.atan2(-0, x)
+        self.ftest('atan2(-0., -inf)', math.atan2(-0., NINF), -math.pi)
+        self.ftest('atan2(-0., -2.3)', math.atan2(-0., -2.3), -math.pi)
+        self.ftest('atan2(-0., -0.)', math.atan2(-0., -0.), -math.pi)
+        self.assertEqual(math.atan2(-0., 0.), -0.)
+        self.assertEqual(math.atan2(-0., 2.3), -0.)
+        self.assertEqual(math.atan2(-0., INF), -0.)
+        self.assertTrue(math.isnan(math.atan2(-0., NAN)))
+        # math.atan2(INF, x)
+        self.ftest('atan2(inf, -inf)', math.atan2(INF, NINF), math.pi*3/4)
+        self.ftest('atan2(inf, -2.3)', math.atan2(INF, -2.3), math.pi/2)
+        self.ftest('atan2(inf, -0.)', math.atan2(INF, -0.0), math.pi/2)
+        self.ftest('atan2(inf, 0.)', math.atan2(INF, 0.0), math.pi/2)
+        self.ftest('atan2(inf, 2.3)', math.atan2(INF, 2.3), math.pi/2)
+        self.ftest('atan2(inf, inf)', math.atan2(INF, INF), math.pi/4)
+        self.assertTrue(math.isnan(math.atan2(INF, NAN)))
+        # math.atan2(NINF, x)
+        self.ftest('atan2(-inf, -inf)', math.atan2(NINF, NINF), -math.pi*3/4)
+        self.ftest('atan2(-inf, -2.3)', math.atan2(NINF, -2.3), -math.pi/2)
+        self.ftest('atan2(-inf, -0.)', math.atan2(NINF, -0.0), -math.pi/2)
+        self.ftest('atan2(-inf, 0.)', math.atan2(NINF, 0.0), -math.pi/2)
+        self.ftest('atan2(-inf, 2.3)', math.atan2(NINF, 2.3), -math.pi/2)
+        self.ftest('atan2(-inf, inf)', math.atan2(NINF, INF), -math.pi/4)
+        self.assertTrue(math.isnan(math.atan2(NINF, NAN)))
+        # math.atan2(+finite, x)
+        self.ftest('atan2(2.3, -inf)', math.atan2(2.3, NINF), math.pi)
+        self.ftest('atan2(2.3, -0.)', math.atan2(2.3, -0.), math.pi/2)
+        self.ftest('atan2(2.3, 0.)', math.atan2(2.3, 0.), math.pi/2)
+        self.assertEqual(math.atan2(2.3, INF), 0.)
+        self.assertTrue(math.isnan(math.atan2(2.3, NAN)))
+        # math.atan2(-finite, x)
+        self.ftest('atan2(-2.3, -inf)', math.atan2(-2.3, NINF), -math.pi)
+        self.ftest('atan2(-2.3, -0.)', math.atan2(-2.3, -0.), -math.pi/2)
+        self.ftest('atan2(-2.3, 0.)', math.atan2(-2.3, 0.), -math.pi/2)
+        self.assertEqual(math.atan2(-2.3, INF), -0.)
+        self.assertTrue(math.isnan(math.atan2(-2.3, NAN)))
+        # math.atan2(NAN, x)
+        self.assertTrue(math.isnan(math.atan2(NAN, NINF)))
+        self.assertTrue(math.isnan(math.atan2(NAN, -2.3)))
+        self.assertTrue(math.isnan(math.atan2(NAN, -0.)))
+        self.assertTrue(math.isnan(math.atan2(NAN, 0.)))
+        self.assertTrue(math.isnan(math.atan2(NAN, 2.3)))
+        self.assertTrue(math.isnan(math.atan2(NAN, INF)))
+        self.assertTrue(math.isnan(math.atan2(NAN, NAN)))
+
+    @unittest.skip('RustPython')
+    def testCeil(self):
+        self.assertRaises(TypeError, math.ceil)
+        self.assertEqual(int, type(math.ceil(0.5)))
+        self.assertEqual(math.ceil(0.5), 1)
+        self.assertEqual(math.ceil(1.0), 1)
+        self.assertEqual(math.ceil(1.5), 2)
+        self.assertEqual(math.ceil(-0.5), 0)
+        self.assertEqual(math.ceil(-1.0), -1)
+        self.assertEqual(math.ceil(-1.5), -1)
+        self.assertEqual(math.ceil(0.0), 0)
+        self.assertEqual(math.ceil(-0.0), 0)
+        #self.assertEqual(math.ceil(INF), INF)
+        #self.assertEqual(math.ceil(NINF), NINF)
+        #self.assertTrue(math.isnan(math.ceil(NAN)))
+
+        class TestCeil:
+            def __ceil__(self):
+                return 42
+        class FloatCeil(float):
+            def __ceil__(self):
+                return 42
+        class TestNoCeil:
+            pass
+        self.assertEqual(math.ceil(TestCeil()), 42)
+        self.assertEqual(math.ceil(FloatCeil()), 42)
+        self.assertEqual(math.ceil(FloatLike(42.5)), 43)
+        self.assertRaises(TypeError, math.ceil, TestNoCeil())
+
+        t = TestNoCeil()
+        t.__ceil__ = lambda *args: args
+        self.assertRaises(TypeError, math.ceil, t)
+        self.assertRaises(TypeError, math.ceil, t, 0)
+
+    # TODO Rustpython
+    # @requires_IEEE_754
+    def testCopysign(self):
+        self.assertEqual(math.copysign(1, 42), 1.0)
+        self.assertEqual(math.copysign(0., 42), 0.0)
+        self.assertEqual(math.copysign(1., -42), -1.0)
+        self.assertEqual(math.copysign(3, 0.), 3.0)
+        self.assertEqual(math.copysign(4., -0.), -4.0)
+
+        self.assertRaises(TypeError, math.copysign)
+        # copysign should let us distinguish signs of zeros
+        self.assertEqual(math.copysign(1., 0.), 1.)
+        self.assertEqual(math.copysign(1., -0.), -1.)
+        self.assertEqual(math.copysign(INF, 0.), INF)
+        self.assertEqual(math.copysign(INF, -0.), NINF)
+        self.assertEqual(math.copysign(NINF, 0.), INF)
+        self.assertEqual(math.copysign(NINF, -0.), NINF)
+        # and of infinities
+        self.assertEqual(math.copysign(1., INF), 1.)
+        self.assertEqual(math.copysign(1., NINF), -1.)
+        self.assertEqual(math.copysign(INF, INF), INF)
+        self.assertEqual(math.copysign(INF, NINF), NINF)
+        self.assertEqual(math.copysign(NINF, INF), INF)
+        self.assertEqual(math.copysign(NINF, NINF), NINF)
+        self.assertTrue(math.isnan(math.copysign(NAN, 1.)))
+        self.assertTrue(math.isnan(math.copysign(NAN, INF)))
+        self.assertTrue(math.isnan(math.copysign(NAN, NINF)))
+        self.assertTrue(math.isnan(math.copysign(NAN, NAN)))
+        # copysign(INF, NAN) may be INF or it may be NINF, since
+        # we don't know whether the sign bit of NAN is set on any
+        # given platform.
+        self.assertTrue(math.isinf(math.copysign(INF, NAN)))
+        # similarly, copysign(2., NAN) could be 2. or -2.
+        self.assertEqual(abs(math.copysign(2., NAN)), 2.)
+
+    @unittest.skip('RustPython')
+    def testCos(self):
+        self.assertRaises(TypeError, math.cos)
+        self.ftest('cos(-pi/2)', math.cos(-math.pi/2), 0, abs_tol=math.ulp(1))
+        self.ftest('cos(0)', math.cos(0), 1)
+        self.ftest('cos(pi/2)', math.cos(math.pi/2), 0, abs_tol=math.ulp(1))
+        self.ftest('cos(pi)', math.cos(math.pi), -1)
+        try:
+            self.assertTrue(math.isnan(math.cos(INF)))
+            self.assertTrue(math.isnan(math.cos(NINF)))
+        except ValueError:
+            self.assertRaises(ValueError, math.cos, INF)
+            self.assertRaises(ValueError, math.cos, NINF)
+        self.assertTrue(math.isnan(math.cos(NAN)))
+
+    @unittest.skipIf(sys.platform == 'win32' and platform.machine() in ('ARM', 'ARM64'),
+                    "Windows UCRT is off by 2 ULP this test requires accuracy within 1 ULP")
+    def testCosh(self):
+        self.assertRaises(TypeError, math.cosh)
+        self.ftest('cosh(0)', math.cosh(0), 1)
+        self.ftest('cosh(2)-2*cosh(1)**2', math.cosh(2)-2*math.cosh(1)**2, -1) # Thanks to Lambert
+        self.assertEqual(math.cosh(INF), INF)
+        self.assertEqual(math.cosh(NINF), INF)
+        self.assertTrue(math.isnan(math.cosh(NAN)))
+
+    def testDegrees(self):
+        self.assertRaises(TypeError, math.degrees)
+        self.ftest('degrees(pi)', math.degrees(math.pi), 180.0)
+        self.ftest('degrees(pi/2)', math.degrees(math.pi/2), 90.0)
+        self.ftest('degrees(-pi/4)', math.degrees(-math.pi/4), -45.0)
+        self.ftest('degrees(0)', math.degrees(0), 0)
+
+    @unittest.skip('TODO RustPython')
+    def testExp(self):
+        self.assertRaises(TypeError, math.exp)
+        self.ftest('exp(-1)', math.exp(-1), 1/math.e)
+        self.ftest('exp(0)', math.exp(0), 1)
+        self.ftest('exp(1)', math.exp(1), math.e)
+        self.assertEqual(math.exp(INF), INF)
+        self.assertEqual(math.exp(NINF), 0.)
+        self.assertTrue(math.isnan(math.exp(NAN)))
+        self.assertRaises(OverflowError, math.exp, 1000000)
+
+    def testFabs(self):
+        self.assertRaises(TypeError, math.fabs)
+        self.ftest('fabs(-1)', math.fabs(-1), 1)
+        self.ftest('fabs(0)', math.fabs(0), 0)
+        self.ftest('fabs(1)', math.fabs(1), 1)
+
+    def testFactorial(self):
+        self.assertEqual(math.factorial(0), 1)
+        total = 1
+        for i in range(1, 1000):
+            total *= i
+            self.assertEqual(math.factorial(i), total)
+            self.assertEqual(math.factorial(i), py_factorial(i))
+        self.assertRaises(ValueError, math.factorial, -1)
+        self.assertRaises(ValueError, math.factorial, -10**100)
+
+    @unittest.skip('RustPython')
+    def testFactorialNonIntegers(self):
+        with self.assertWarns(DeprecationWarning):
+            self.assertEqual(math.factorial(5.0), 120)
+        with self.assertWarns(DeprecationWarning):
+            self.assertRaises(ValueError, math.factorial, 5.2)
+        with self.assertWarns(DeprecationWarning):
+            self.assertRaises(ValueError, math.factorial, -1.0)
+        with self.assertWarns(DeprecationWarning):
+            self.assertRaises(ValueError, math.factorial, -1e100)
+        self.assertRaises(TypeError, math.factorial, decimal.Decimal('5'))
+        self.assertRaises(TypeError, math.factorial, decimal.Decimal('5.2'))
+        self.assertRaises(TypeError, math.factorial, "5")
+
+    # Other implementations may place different upper bounds.
+    @support.cpython_only
+    def testFactorialHugeInputs(self):
+        # Currently raises OverflowError for inputs that are too large
+        # to fit into a C long.
+        self.assertRaises(OverflowError, math.factorial, 10**100)
+        with self.assertWarns(DeprecationWarning):
+            self.assertRaises(OverflowError, math.factorial, 1e100)
+
+    @unittest.skip('TODO RustPython')
+    def testFloor(self):
+        self.assertRaises(TypeError, math.floor)
+        self.assertEqual(int, type(math.floor(0.5)))
+        self.assertEqual(math.floor(0.5), 0)
+        self.assertEqual(math.floor(1.0), 1)
+        self.assertEqual(math.floor(1.5), 1)
+        self.assertEqual(math.floor(-0.5), -1)
+        self.assertEqual(math.floor(-1.0), -1)
+        self.assertEqual(math.floor(-1.5), -2)
+        #self.assertEqual(math.ceil(INF), INF)
+        #self.assertEqual(math.ceil(NINF), NINF)
+        #self.assertTrue(math.isnan(math.floor(NAN)))
+
+        class TestFloor:
+            def __floor__(self):
+                return 42
+        class FloatFloor(float):
+            def __floor__(self):
+                return 42
+        class TestNoFloor:
+            pass
+        self.assertEqual(math.floor(TestFloor()), 42)
+        self.assertEqual(math.floor(FloatFloor()), 42)
+        self.assertEqual(math.floor(FloatLike(41.9)), 41)
+        self.assertRaises(TypeError, math.floor, TestNoFloor())
+
+        t = TestNoFloor()
+        t.__floor__ = lambda *args: args
+        self.assertRaises(TypeError, math.floor, t)
+        self.assertRaises(TypeError, math.floor, t, 0)
+
+    def testFmod(self):
+        self.assertRaises(TypeError, math.fmod)
+        self.ftest('fmod(10, 1)', math.fmod(10, 1), 0.0)
+        self.ftest('fmod(10, 0.5)', math.fmod(10, 0.5), 0.0)
+        self.ftest('fmod(10, 1.5)', math.fmod(10, 1.5), 1.0)
+        self.ftest('fmod(-10, 1)', math.fmod(-10, 1), -0.0)
+        self.ftest('fmod(-10, 0.5)', math.fmod(-10, 0.5), -0.0)
+        self.ftest('fmod(-10, 1.5)', math.fmod(-10, 1.5), -1.0)
+        self.assertTrue(math.isnan(math.fmod(NAN, 1.)))
+        self.assertTrue(math.isnan(math.fmod(1., NAN)))
+        self.assertTrue(math.isnan(math.fmod(NAN, NAN)))
+        self.assertRaises(ValueError, math.fmod, 1., 0.)
+        self.assertRaises(ValueError, math.fmod, INF, 1.)
+        self.assertRaises(ValueError, math.fmod, NINF, 1.)
+        self.assertRaises(ValueError, math.fmod, INF, 0.)
+        self.assertEqual(math.fmod(3.0, INF), 3.0)
+        self.assertEqual(math.fmod(-3.0, INF), -3.0)
+        self.assertEqual(math.fmod(3.0, NINF), 3.0)
+        self.assertEqual(math.fmod(-3.0, NINF), -3.0)
+        self.assertEqual(math.fmod(0.0, 3.0), 0.0)
+        self.assertEqual(math.fmod(0.0, NINF), 0.0)
+
+    def testFrexp(self):
+        self.assertRaises(TypeError, math.frexp)
+
+        def testfrexp(name, result, expected):
+            (mant, exp), (emant, eexp) = result, expected
+            if abs(mant-emant) > eps or exp != eexp:
+                self.fail('%s returned %r, expected %r'%\
+                          (name, result, expected))
+
+        testfrexp('frexp(-1)', math.frexp(-1), (-0.5, 1))
+        testfrexp('frexp(0)', math.frexp(0), (0, 0))
+        testfrexp('frexp(1)', math.frexp(1), (0.5, 1))
+        testfrexp('frexp(2)', math.frexp(2), (0.5, 2))
+
+        self.assertEqual(math.frexp(INF)[0], INF)
+        self.assertEqual(math.frexp(NINF)[0], NINF)
+        self.assertTrue(math.isnan(math.frexp(NAN)[0]))
+
+
+    # TODO Rustpython
+    # @requires_IEEE_754
+    # @unittest.skipIf(HAVE_DOUBLE_ROUNDING,
+    #                      "fsum is not exact on machines with double rounding")
+    # def testFsum(self):
+    #     # math.fsum relies on exact rounding for correct operation.
+    #     # There's a known problem with IA32 floating-point that causes
+    #     # inexact rounding in some situations, and will cause the
+    #     # math.fsum tests below to fail; see issue #2937.  On non IEEE
+    #     # 754 platforms, and on IEEE 754 platforms that exhibit the
+    #     # problem described in issue #2937, we simply skip the whole
+    #     # test.
+
+    #     # Python version of math.fsum, for comparison.  Uses a
+    #     # different algorithm based on frexp, ldexp and integer
+    #     # arithmetic.
+    #     from sys import float_info
+    #     mant_dig = float_info.mant_dig
+    #     etiny = float_info.min_exp - mant_dig
+
+    #     def msum(iterable):
+    #         """Full precision summation.  Compute sum(iterable) without any
+    #         intermediate accumulation of error.  Based on the 'lsum' function
+    #         at http://code.activestate.com/recipes/393090/
+    #         """
+    #         tmant, texp = 0, 0
+    #         for x in iterable:
+    #             mant, exp = math.frexp(x)
+    #             mant, exp = int(math.ldexp(mant, mant_dig)), exp - mant_dig
+    #             if texp > exp:
+    #                 tmant <<= texp-exp
+    #                 texp = exp
+    #             else:
+    #                 mant <<= exp-texp
+    #             tmant += mant
+    #         # Round tmant * 2**texp to a float.  The original recipe
+    #         # used float(str(tmant)) * 2.0**texp for this, but that's
+    #         # a little unsafe because str -> float conversion can't be
+    #         # relied upon to do correct rounding on all platforms.
+    #         tail = max(len(bin(abs(tmant)))-2 - mant_dig, etiny - texp)
+    #         if tail > 0:
+    #             h = 1 << (tail-1)
+    #             tmant = tmant // (2*h) + bool(tmant & h and tmant & 3*h-1)
+    #             texp += tail
+    #         return math.ldexp(tmant, texp)
+
+    #     test_values = [
+    #         ([], 0.0),
+    #         ([0.0], 0.0),
+    #         ([1e100, 1.0, -1e100, 1e-100, 1e50, -1.0, -1e50], 1e-100),
+    #         ([2.0**53, -0.5, -2.0**-54], 2.0**53-1.0),
+    #         ([2.0**53, 1.0, 2.0**-100], 2.0**53+2.0),
+    #         ([2.0**53+10.0, 1.0, 2.0**-100], 2.0**53+12.0),
+    #         ([2.0**53-4.0, 0.5, 2.0**-54], 2.0**53-3.0),
+    #         ([1./n for n in range(1, 1001)],
+    #          float.fromhex('0x1.df11f45f4e61ap+2')),
+    #         ([(-1.)**n/n for n in range(1, 1001)],
+    #          float.fromhex('-0x1.62a2af1bd3624p-1')),
+    #         ([1e16, 1., 1e-16], 10000000000000002.0),
+    #         ([1e16-2., 1.-2.**-53, -(1e16-2.), -(1.-2.**-53)], 0.0),
+    #         # exercise code for resizing partials array
+    #         ([2.**n - 2.**(n+50) + 2.**(n+52) for n in range(-1074, 972, 2)] +
+    #          [-2.**1022],
+    #          float.fromhex('0x1.5555555555555p+970')),
+    #         ]
+
+    #     # Telescoping sum, with exact differences (due to Sterbenz)
+    #     terms = [1.7**i for i in range(1001)]
+    #     test_values.append((
+    #         [terms[i+1] - terms[i] for i in range(1000)] + [-terms[1000]],
+    #         -terms[0]
+    #     ))
+
+    #     for i, (vals, expected) in enumerate(test_values):
+    #         try:
+    #             actual = math.fsum(vals)
+    #         except OverflowError:
+    #             self.fail("test %d failed: got OverflowError, expected %r "
+    #                       "for math.fsum(%.100r)" % (i, expected, vals))
+    #         except ValueError:
+    #             self.fail("test %d failed: got ValueError, expected %r "
+    #                       "for math.fsum(%.100r)" % (i, expected, vals))
+    #         self.assertEqual(actual, expected)
+
+    #     from random import random, gauss, shuffle
+    #     for j in range(1000):
+    #         vals = [7, 1e100, -7, -1e100, -9e-20, 8e-20] * 10
+    #         s = 0
+    #         for i in range(200):
+    #             v = gauss(0, random()) ** 7 - s
+    #             s += v
+    #             vals.append(v)
+    #         shuffle(vals)
+
+    #         s = msum(vals)
+    #         self.assertEqual(msum(vals), math.fsum(vals))
+
+
+    # Python 3.9
+    def testGcd(self):
+        gcd = math.gcd
+        self.assertEqual(gcd(0, 0), 0)
+        self.assertEqual(gcd(1, 0), 1)
+        self.assertEqual(gcd(-1, 0), 1)
+        self.assertEqual(gcd(0, 1), 1)
+        self.assertEqual(gcd(0, -1), 1)
+        self.assertEqual(gcd(7, 1), 1)
+        self.assertEqual(gcd(7, -1), 1)
+        self.assertEqual(gcd(-23, 15), 1)
+        self.assertEqual(gcd(120, 84), 12)
+        self.assertEqual(gcd(84, -120), 12)
+        self.assertEqual(gcd(1216342683557601535506311712,
+                             436522681849110124616458784), 32)
+
+        x = 434610456570399902378880679233098819019853229470286994367836600566
+        y = 1064502245825115327754847244914921553977
+        for c in (652560,
+                  576559230871654959816130551884856912003141446781646602790216406874):
+            a = x * c
+            b = y * c
+            self.assertEqual(gcd(a, b), c)
+            self.assertEqual(gcd(b, a), c)
+            self.assertEqual(gcd(-a, b), c)
+            self.assertEqual(gcd(b, -a), c)
+            self.assertEqual(gcd(a, -b), c)
+            self.assertEqual(gcd(-b, a), c)
+            self.assertEqual(gcd(-a, -b), c)
+            self.assertEqual(gcd(-b, -a), c)
+
+        self.assertEqual(gcd(), 0)
+        self.assertEqual(gcd(120), 120)
+        self.assertEqual(gcd(-120), 120)
+        self.assertEqual(gcd(120, 84, 102), 6)
+        self.assertEqual(gcd(120, 1, 84), 1)
+
+        self.assertRaises(TypeError, gcd, 120.0)
+        self.assertRaises(TypeError, gcd, 120.0, 84)
+        self.assertRaises(TypeError, gcd, 120, 84.0)
+        self.assertRaises(TypeError, gcd, 120, 1, 84.0)
+        #self.assertEqual(gcd(MyIndexable(120), MyIndexable(84)), 12) # TODO RustPython
+
+    @unittest.skip('TODO: RustPython float support')
+    def testHypot(self):
+        from decimal import Decimal
+        from fractions import Fraction
+
+        hypot = math.hypot
+
+        # Test different numbers of arguments (from zero to five)
+        # against a straightforward pure python implementation
+        args = math.e, math.pi, math.sqrt(2.0), math.gamma(3.5), math.sin(2.1)
+        for i in range(len(args)+1):
+            self.assertAlmostEqual(
+                hypot(*args[:i]),
+                math.sqrt(sum(s**2 for s in args[:i]))
+            )
+
+        # Test allowable types (those with __float__)
+        self.assertEqual(hypot(12.0, 5.0), 13.0)
+        self.assertEqual(hypot(12, 5), 13)
+        self.assertEqual(hypot(Decimal(12), Decimal(5)), 13)
+        self.assertEqual(hypot(Fraction(12, 32), Fraction(5, 32)), Fraction(13, 32))
+        self.assertEqual(hypot(bool(1), bool(0), bool(1), bool(1)), math.sqrt(3))
+
+        # Test corner cases
+        self.assertEqual(hypot(0.0, 0.0), 0.0)     # Max input is zero
+        self.assertEqual(hypot(-10.5), 10.5)       # Negative input
+        self.assertEqual(hypot(), 0.0)             # Negative input
+        self.assertEqual(1.0,
+            math.copysign(1.0, hypot(-0.0))        # Convert negative zero to positive zero
+        )
+        self.assertEqual(                          # Handling of moving max to the end
+            hypot(1.5, 1.5, 0.5),
+            hypot(1.5, 0.5, 1.5),
+        )
+
+        # Test handling of bad arguments
+        with self.assertRaises(TypeError):         # Reject keyword args
+            hypot(x=1)
+        with self.assertRaises(TypeError):         # Reject values without __float__
+            hypot(1.1, 'string', 2.2)
+        int_too_big_for_float = 10 ** (sys.float_info.max_10_exp + 5)
+        with self.assertRaises((ValueError, OverflowError)):
+            hypot(1, int_too_big_for_float)
+
+        # Any infinity gives positive infinity.
+        self.assertEqual(hypot(INF), INF)
+        self.assertEqual(hypot(0, INF), INF)
+        self.assertEqual(hypot(10, INF), INF)
+        self.assertEqual(hypot(-10, INF), INF)
+        self.assertEqual(hypot(NAN, INF), INF)
+        self.assertEqual(hypot(INF, NAN), INF)
+        self.assertEqual(hypot(NINF, NAN), INF)
+        self.assertEqual(hypot(NAN, NINF), INF)
+        self.assertEqual(hypot(-INF, INF), INF)
+        self.assertEqual(hypot(-INF, -INF), INF)
+        self.assertEqual(hypot(10, -INF), INF)
+
+        # If no infinity, any NaN gives a NaN.
+        self.assertTrue(math.isnan(hypot(NAN)))
+        self.assertTrue(math.isnan(hypot(0, NAN)))
+        self.assertTrue(math.isnan(hypot(NAN, 10)))
+        self.assertTrue(math.isnan(hypot(10, NAN)))
+        self.assertTrue(math.isnan(hypot(NAN, NAN)))
+        self.assertTrue(math.isnan(hypot(NAN)))
+
+        # Verify scaling for extremely large values
+        fourthmax = FLOAT_MAX / 4.0
+        for n in range(32):
+            self.assertEqual(hypot(*([fourthmax]*n)), fourthmax * math.sqrt(n))
+
+        # Verify scaling for extremely small values
+        for exp in range(32):
+            scale = FLOAT_MIN / 2.0 ** exp
+            self.assertEqual(math.hypot(4*scale, 3*scale), 5*scale)
+
+    @unittest.skip('RustPython')
+    def testDist(self):
+        from decimal import Decimal as D
+        from fractions import Fraction as F
+
+        dist = math.dist
+        sqrt = math.sqrt
+
+        # Simple exact cases
+        self.assertEqual(dist((1.0, 2.0, 3.0), (4.0, 2.0, -1.0)), 5.0)
+        self.assertEqual(dist((1, 2, 3), (4, 2, -1)), 5.0)
+
+        # Test different numbers of arguments (from zero to nine)
+        # against a straightforward pure python implementation
+        for i in range(9):
+            for j in range(5):
+                p = tuple(random.uniform(-5, 5) for k in range(i))
+                q = tuple(random.uniform(-5, 5) for k in range(i))
+                self.assertAlmostEqual(
+                    dist(p, q),
+                    sqrt(sum((px - qx) ** 2.0 for px, qx in zip(p, q)))
+                )
+
+        # Test non-tuple inputs
+        self.assertEqual(dist([1.0, 2.0, 3.0], [4.0, 2.0, -1.0]), 5.0)
+        self.assertEqual(dist(iter([1.0, 2.0, 3.0]), iter([4.0, 2.0, -1.0])), 5.0)
+
+        # Test allowable types (those with __float__)
+        self.assertEqual(dist((14.0, 1.0), (2.0, -4.0)), 13.0)
+        self.assertEqual(dist((14, 1), (2, -4)), 13)
+        self.assertEqual(dist((D(14), D(1)), (D(2), D(-4))), D(13))
+        self.assertEqual(dist((F(14, 32), F(1, 32)), (F(2, 32), F(-4, 32))),
+                         F(13, 32))
+        self.assertEqual(dist((True, True, False, True, False),
+                              (True, False, True, True, False)),
+                         sqrt(2.0))
+
+        # Test corner cases
+        self.assertEqual(dist((13.25, 12.5, -3.25),
+                              (13.25, 12.5, -3.25)),
+                         0.0)                      # Distance with self is zero
+        self.assertEqual(dist((), ()), 0.0)        # Zero-dimensional case
+        self.assertEqual(1.0,                      # Convert negative zero to positive zero
+            math.copysign(1.0, dist((-0.0,), (0.0,)))
+        )
+        self.assertEqual(1.0,                      # Convert negative zero to positive zero
+            math.copysign(1.0, dist((0.0,), (-0.0,)))
+        )
+        self.assertEqual(                          # Handling of moving max to the end
+            dist((1.5, 1.5, 0.5), (0, 0, 0)),
+            dist((1.5, 0.5, 1.5), (0, 0, 0))
+        )
+
+        # Verify tuple subclasses are allowed
+        class T(tuple):
+            pass
+        self.assertEqual(dist(T((1, 2, 3)), ((4, 2, -1))), 5.0)
+
+        # Test handling of bad arguments
+        with self.assertRaises(TypeError):         # Reject keyword args
+            dist(p=(1, 2, 3), q=(4, 5, 6))
+        with self.assertRaises(TypeError):         # Too few args
+            dist((1, 2, 3))
+        with self.assertRaises(TypeError):         # Too many args
+            dist((1, 2, 3), (4, 5, 6), (7, 8, 9))
+        with self.assertRaises(TypeError):         # Scalars not allowed
+            dist(1, 2)
+        with self.assertRaises(TypeError):         # Reject values without __float__
+            dist((1.1, 'string', 2.2), (1, 2, 3))
+        with self.assertRaises(ValueError):        # Check dimension agree
+            dist((1, 2, 3, 4), (5, 6, 7))
+        with self.assertRaises(ValueError):        # Check dimension agree
+            dist((1, 2, 3), (4, 5, 6, 7))
+        with self.assertRaises(TypeError):         # Rejects invalid types
+            dist("abc", "xyz")
+        int_too_big_for_float = 10 ** (sys.float_info.max_10_exp + 5)
+        with self.assertRaises((ValueError, OverflowError)):
+            dist((1, int_too_big_for_float), (2, 3))
+        with self.assertRaises((ValueError, OverflowError)):
+            dist((2, 3), (1, int_too_big_for_float))
+
+        # Verify that the one dimensional case is equivalent to abs()
+        for i in range(20):
+            p, q = random.random(), random.random()
+            self.assertEqual(dist((p,), (q,)), abs(p - q))
+
+        # Test special values
+        values = [NINF, -10.5, -0.0, 0.0, 10.5, INF, NAN]
+        for p in itertools.product(values, repeat=3):
+            for q in itertools.product(values, repeat=3):
+                diffs = [px - qx for px, qx in zip(p, q)]
+                if any(map(math.isinf, diffs)):
+                    # Any infinite difference gives positive infinity.
+                    self.assertEqual(dist(p, q), INF)
+                elif any(map(math.isnan, diffs)):
+                    # If no infinity, any NaN gives a NaN.
+                    self.assertTrue(math.isnan(dist(p, q)))
+
+        # Verify scaling for extremely large values
+        fourthmax = FLOAT_MAX / 4.0
+        for n in range(32):
+            p = (fourthmax,) * n
+            q = (0.0,) * n
+            self.assertEqual(dist(p, q), fourthmax * math.sqrt(n))
+            self.assertEqual(dist(q, p), fourthmax * math.sqrt(n))
+
+        # Verify scaling for extremely small values
+        for exp in range(32):
+            scale = FLOAT_MIN / 2.0 ** exp
+            p = (4*scale, 3*scale)
+            q = (0.0, 0.0)
+            self.assertEqual(math.dist(p, q), 5*scale)
+            self.assertEqual(math.dist(q, p), 5*scale)
+
+    @unittest.skip('TODO RustPython')
+    def testIsqrt(self):
+        # Test a variety of inputs, large and small.
+        test_values = (
+            list(range(1000))
+            + list(range(10**6 - 1000, 10**6 + 1000))
+            + [2**e + i for e in range(60, 200) for i in range(-40, 40)]
+            + [3**9999, 10**5001]
+        )
+
+        for value in test_values:
+            with self.subTest(value=value):
+                s = math.isqrt(value)
+                self.assertIs(type(s), int)
+                self.assertLessEqual(s*s, value)
+                self.assertLess(value, (s+1)*(s+1))
+
+        # Negative values
+        with self.assertRaises(ValueError):
+            math.isqrt(-1)
+
+        # Integer-like things
+        s = math.isqrt(True)
+        self.assertIs(type(s), int)
+        self.assertEqual(s, 1)
+
+        s = math.isqrt(False)
+        self.assertIs(type(s), int)
+        self.assertEqual(s, 0)
+
+        class IntegerLike(object):
+            def __init__(self, value):
+                self.value = value
+
+            def __index__(self):
+                return self.value
+
+        s = math.isqrt(IntegerLike(1729))
+        self.assertIs(type(s), int)
+        self.assertEqual(s, 41)
+
+        with self.assertRaises(ValueError):
+            math.isqrt(IntegerLike(-3))
+
+        # Non-integer-like things
+        bad_values = [
+            3.5, "a string", decimal.Decimal("3.5"), 3.5j,
+            100.0, -4.0,
+        ]
+        for value in bad_values:
+            with self.subTest(value=value):
+                with self.assertRaises(TypeError):
+                    math.isqrt(value)
+
+    # Python 3.9
+    def testlcm(self):
+        lcm = math.lcm
+        self.assertEqual(lcm(0, 0), 0)
+        self.assertEqual(lcm(1, 0), 0)
+        self.assertEqual(lcm(-1, 0), 0)
+        self.assertEqual(lcm(0, 1), 0)
+        self.assertEqual(lcm(0, -1), 0)
+        self.assertEqual(lcm(7, 1), 7)
+        self.assertEqual(lcm(7, -1), 7)
+        self.assertEqual(lcm(-23, 15), 345)
+        self.assertEqual(lcm(120, 84), 840)
+        self.assertEqual(lcm(84, -120), 840)
+        self.assertEqual(lcm(1216342683557601535506311712,
+                             436522681849110124616458784),
+                             16592536571065866494401400422922201534178938447014944)
+
+        x = 43461045657039990237
+        y = 10645022458251153277
+        for c in (652560,
+                  57655923087165495981):
+            a = x * c
+            b = y * c
+            d = x * y * c
+            self.assertEqual(lcm(a, b), d)
+            self.assertEqual(lcm(b, a), d)
+            self.assertEqual(lcm(-a, b), d)
+            self.assertEqual(lcm(b, -a), d)
+            self.assertEqual(lcm(a, -b), d)
+            self.assertEqual(lcm(-b, a), d)
+            self.assertEqual(lcm(-a, -b), d)
+            self.assertEqual(lcm(-b, -a), d)
+
+        self.assertEqual(lcm(), 1)
+        self.assertEqual(lcm(120), 120)
+        self.assertEqual(lcm(-120), 120)
+        self.assertEqual(lcm(120, 84, 102), 14280)
+        self.assertEqual(lcm(120, 0, 84), 0)
+
+        self.assertRaises(TypeError, lcm, 120.0)
+        self.assertRaises(TypeError, lcm, 120.0, 84)
+        self.assertRaises(TypeError, lcm, 120, 84.0)
+        self.assertRaises(TypeError, lcm, 120, 0, 84.0)
+        # self.assertEqual(lcm(MyIndexable(120), MyIndexable(84)), 840) # TODO RustPython
+
+    @unittest.skip('TODO RustPython')
+    def testLdexp(self):
+        self.assertRaises(TypeError, math.ldexp)
+        self.ftest('ldexp(0,1)', math.ldexp(0,1), 0)
+        self.ftest('ldexp(1,1)', math.ldexp(1,1), 2)
+        self.ftest('ldexp(1,-1)', math.ldexp(1,-1), 0.5)
+        self.ftest('ldexp(-1,1)', math.ldexp(-1,1), -2)
+        self.assertRaises(OverflowError, math.ldexp, 1., 1000000)
+        self.assertRaises(OverflowError, math.ldexp, -1., 1000000)
+        self.assertEqual(math.ldexp(1., -1000000), 0.)
+        self.assertEqual(math.ldexp(-1., -1000000), -0.)
+        self.assertEqual(math.ldexp(INF, 30), INF)
+        self.assertEqual(math.ldexp(NINF, -213), NINF)
+        self.assertTrue(math.isnan(math.ldexp(NAN, 0)))
+
+        # large second argument
+        for n in [10**5, 10**10, 10**20, 10**40]:
+            self.assertEqual(math.ldexp(INF, -n), INF)
+            self.assertEqual(math.ldexp(NINF, -n), NINF)
+            self.assertEqual(math.ldexp(1., -n), 0.)
+            self.assertEqual(math.ldexp(-1., -n), -0.)
+            self.assertEqual(math.ldexp(0., -n), 0.)
+            self.assertEqual(math.ldexp(-0., -n), -0.)
+            self.assertTrue(math.isnan(math.ldexp(NAN, -n)))
+
+            self.assertRaises(OverflowError, math.ldexp, 1., n)
+            self.assertRaises(OverflowError, math.ldexp, -1., n)
+            self.assertEqual(math.ldexp(0., n), 0.)
+            self.assertEqual(math.ldexp(-0., n), -0.)
+            self.assertEqual(math.ldexp(INF, n), INF)
+            self.assertEqual(math.ldexp(NINF, n), NINF)
+            self.assertTrue(math.isnan(math.ldexp(NAN, n)))
+
+    @unittest.skip('TODO RustPython')
+    def testLog(self):
+        self.assertRaises(TypeError, math.log)
+        self.ftest('log(1/e)', math.log(1/math.e), -1)
+        self.ftest('log(1)', math.log(1), 0)
+        self.ftest('log(e)', math.log(math.e), 1)
+        self.ftest('log(32,2)', math.log(32,2), 5)
+        self.ftest('log(10**40, 10)', math.log(10**40, 10), 40)
+        self.ftest('log(10**40, 10**20)', math.log(10**40, 10**20), 2)
+        self.ftest('log(10**1000)', math.log(10**1000),
+                   2302.5850929940457)
+        self.assertRaises(ValueError, math.log, -1.5)
+        self.assertRaises(ValueError, math.log, -10**1000)
+        self.assertRaises(ValueError, math.log, NINF)
+        self.assertEqual(math.log(INF), INF)
+        self.assertTrue(math.isnan(math.log(NAN)))
+
+    @unittest.skip('TODO RustPython')
+    def testLog1p(self):
+        self.assertRaises(TypeError, math.log1p)
+        for n in [2, 2**90, 2**300]:
+            self.assertAlmostEqual(math.log1p(n), math.log1p(float(n)))
+        self.assertRaises(ValueError, math.log1p, -1)
+        self.assertEqual(math.log1p(INF), INF)
+
+    # TODO Rustpython
+    # @requires_IEEE_754
+    # def testLog2(self):
+    #     self.assertRaises(TypeError, math.log2)
+
+    #     # Check some integer values
+    #     self.assertEqual(math.log2(1), 0.0)
+    #     self.assertEqual(math.log2(2), 1.0)
+    #     self.assertEqual(math.log2(4), 2.0)
+
+    #     # Large integer values
+    #     self.assertEqual(math.log2(2**1023), 1023.0)
+    #     self.assertEqual(math.log2(2**1024), 1024.0)
+    #     self.assertEqual(math.log2(2**2000), 2000.0)
+
+    #     self.assertRaises(ValueError, math.log2, -1.5)
+    #     self.assertRaises(ValueError, math.log2, NINF)
+    #     self.assertTrue(math.isnan(math.log2(NAN)))
+
+    # TODO Rustpython
+    # @requires_IEEE_754
+    # # log2() is not accurate enough on Mac OS X Tiger (10.4)
+    # @support.requires_mac_ver(10, 5)
+    # def testLog2Exact(self):
+    #     # Check that we get exact equality for log2 of powers of 2.
+    #     actual = [math.log2(math.ldexp(1.0, n)) for n in range(-1074, 1024)]
+    #     expected = [float(n) for n in range(-1074, 1024)]
+    #     self.assertEqual(actual, expected)
+
+    # def testLog10(self):
+    #     self.assertRaises(TypeError, math.log10)
+    #     self.ftest('log10(0.1)', math.log10(0.1), -1)
+    #     self.ftest('log10(1)', math.log10(1), 0)
+    #     self.ftest('log10(10)', math.log10(10), 1)
+    #     self.ftest('log10(10**1000)', math.log10(10**1000), 1000.0)
+    #     self.assertRaises(ValueError, math.log10, -1.5)
+    #     self.assertRaises(ValueError, math.log10, -10**1000)
+    #     self.assertRaises(ValueError, math.log10, NINF)
+    #     self.assertEqual(math.log(INF), INF)
+    #     self.assertTrue(math.isnan(math.log10(NAN)))
+
+    def testModf(self):
+        self.assertRaises(TypeError, math.modf)
+
+        def testmodf(name, result, expected):
+            (v1, v2), (e1, e2) = result, expected
+            if abs(v1-e1) > eps or abs(v2-e2):
+                self.fail('%s returned %r, expected %r'%\
+                          (name, result, expected))
+
+        testmodf('modf(1.5)', math.modf(1.5), (0.5, 1.0))
+        testmodf('modf(-1.5)', math.modf(-1.5), (-0.5, -1.0))
+
+        self.assertEqual(math.modf(INF), (0.0, INF))
+        self.assertEqual(math.modf(NINF), (-0.0, NINF))
+
+        modf_nan = math.modf(NAN)
+        self.assertTrue(math.isnan(modf_nan[0]))
+        self.assertTrue(math.isnan(modf_nan[1]))
+
+    @unittest.skip('TODO RustPython')
+    def testPow(self):
+        self.assertRaises(TypeError, math.pow)
+        self.ftest('pow(0,1)', math.pow(0,1), 0)
+        self.ftest('pow(1,0)', math.pow(1,0), 1)
+        self.ftest('pow(2,1)', math.pow(2,1), 2)
+        self.ftest('pow(2,-1)', math.pow(2,-1), 0.5)
+        self.assertEqual(math.pow(INF, 1), INF)
+        self.assertEqual(math.pow(NINF, 1), NINF)
+        self.assertEqual((math.pow(1, INF)), 1.)
+        self.assertEqual((math.pow(1, NINF)), 1.)
+        self.assertTrue(math.isnan(math.pow(NAN, 1)))
+        self.assertTrue(math.isnan(math.pow(2, NAN)))
+        self.assertTrue(math.isnan(math.pow(0, NAN)))
+        self.assertEqual(math.pow(1, NAN), 1)
+
+        # pow(0., x)
+        self.assertEqual(math.pow(0., INF), 0.)
+        self.assertEqual(math.pow(0., 3.), 0.)
+        self.assertEqual(math.pow(0., 2.3), 0.)
+        self.assertEqual(math.pow(0., 2.), 0.)
+        self.assertEqual(math.pow(0., 0.), 1.)
+        self.assertEqual(math.pow(0., -0.), 1.)
+        self.assertRaises(ValueError, math.pow, 0., -2.)
+        self.assertRaises(ValueError, math.pow, 0., -2.3)
+        self.assertRaises(ValueError, math.pow, 0., -3.)
+        self.assertRaises(ValueError, math.pow, 0., NINF)
+        self.assertTrue(math.isnan(math.pow(0., NAN)))
+
+        # pow(INF, x)
+        self.assertEqual(math.pow(INF, INF), INF)
+        self.assertEqual(math.pow(INF, 3.), INF)
+        self.assertEqual(math.pow(INF, 2.3), INF)
+        self.assertEqual(math.pow(INF, 2.), INF)
+        self.assertEqual(math.pow(INF, 0.), 1.)
+        self.assertEqual(math.pow(INF, -0.), 1.)
+        self.assertEqual(math.pow(INF, -2.), 0.)
+        self.assertEqual(math.pow(INF, -2.3), 0.)
+        self.assertEqual(math.pow(INF, -3.), 0.)
+        self.assertEqual(math.pow(INF, NINF), 0.)
+        self.assertTrue(math.isnan(math.pow(INF, NAN)))
+
+        # pow(-0., x)
+        self.assertEqual(math.pow(-0., INF), 0.)
+        self.assertEqual(math.pow(-0., 3.), -0.)
+        self.assertEqual(math.pow(-0., 2.3), 0.)
+        self.assertEqual(math.pow(-0., 2.), 0.)
+        self.assertEqual(math.pow(-0., 0.), 1.)
+        self.assertEqual(math.pow(-0., -0.), 1.)
+        self.assertRaises(ValueError, math.pow, -0., -2.)
+        self.assertRaises(ValueError, math.pow, -0., -2.3)
+        self.assertRaises(ValueError, math.pow, -0., -3.)
+        self.assertRaises(ValueError, math.pow, -0., NINF)
+        self.assertTrue(math.isnan(math.pow(-0., NAN)))
+
+        # pow(NINF, x)
+        self.assertEqual(math.pow(NINF, INF), INF)
+        self.assertEqual(math.pow(NINF, 3.), NINF)
+        self.assertEqual(math.pow(NINF, 2.3), INF)
+        self.assertEqual(math.pow(NINF, 2.), INF)
+        self.assertEqual(math.pow(NINF, 0.), 1.)
+        self.assertEqual(math.pow(NINF, -0.), 1.)
+        self.assertEqual(math.pow(NINF, -2.), 0.)
+        self.assertEqual(math.pow(NINF, -2.3), 0.)
+        self.assertEqual(math.pow(NINF, -3.), -0.)
+        self.assertEqual(math.pow(NINF, NINF), 0.)
+        self.assertTrue(math.isnan(math.pow(NINF, NAN)))
+
+        # pow(-1, x)
+        self.assertEqual(math.pow(-1., INF), 1.)
+        self.assertEqual(math.pow(-1., 3.), -1.)
+        self.assertRaises(ValueError, math.pow, -1., 2.3)
+        self.assertEqual(math.pow(-1., 2.), 1.)
+        self.assertEqual(math.pow(-1., 0.), 1.)
+        self.assertEqual(math.pow(-1., -0.), 1.)
+        self.assertEqual(math.pow(-1., -2.), 1.)
+        self.assertRaises(ValueError, math.pow, -1., -2.3)
+        self.assertEqual(math.pow(-1., -3.), -1.)
+        self.assertEqual(math.pow(-1., NINF), 1.)
+        self.assertTrue(math.isnan(math.pow(-1., NAN)))
+
+        # pow(1, x)
+        self.assertEqual(math.pow(1., INF), 1.)
+        self.assertEqual(math.pow(1., 3.), 1.)
+        self.assertEqual(math.pow(1., 2.3), 1.)
+        self.assertEqual(math.pow(1., 2.), 1.)
+        self.assertEqual(math.pow(1., 0.), 1.)
+        self.assertEqual(math.pow(1., -0.), 1.)
+        self.assertEqual(math.pow(1., -2.), 1.)
+        self.assertEqual(math.pow(1., -2.3), 1.)
+        self.assertEqual(math.pow(1., -3.), 1.)
+        self.assertEqual(math.pow(1., NINF), 1.)
+        self.assertEqual(math.pow(1., NAN), 1.)
+
+        # pow(x, 0) should be 1 for any x
+        self.assertEqual(math.pow(2.3, 0.), 1.)
+        self.assertEqual(math.pow(-2.3, 0.), 1.)
+        self.assertEqual(math.pow(NAN, 0.), 1.)
+        self.assertEqual(math.pow(2.3, -0.), 1.)
+        self.assertEqual(math.pow(-2.3, -0.), 1.)
+        self.assertEqual(math.pow(NAN, -0.), 1.)
+
+        # pow(x, y) is invalid if x is negative and y is not integral
+        self.assertRaises(ValueError, math.pow, -1., 2.3)
+        self.assertRaises(ValueError, math.pow, -15., -3.1)
+
+        # pow(x, NINF)
+        self.assertEqual(math.pow(1.9, NINF), 0.)
+        self.assertEqual(math.pow(1.1, NINF), 0.)
+        self.assertEqual(math.pow(0.9, NINF), INF)
+        self.assertEqual(math.pow(0.1, NINF), INF)
+        self.assertEqual(math.pow(-0.1, NINF), INF)
+        self.assertEqual(math.pow(-0.9, NINF), INF)
+        self.assertEqual(math.pow(-1.1, NINF), 0.)
+        self.assertEqual(math.pow(-1.9, NINF), 0.)
+
+        # pow(x, INF)
+        self.assertEqual(math.pow(1.9, INF), INF)
+        self.assertEqual(math.pow(1.1, INF), INF)
+        self.assertEqual(math.pow(0.9, INF), 0.)
+        self.assertEqual(math.pow(0.1, INF), 0.)
+        self.assertEqual(math.pow(-0.1, INF), 0.)
+        self.assertEqual(math.pow(-0.9, INF), 0.)
+        self.assertEqual(math.pow(-1.1, INF), INF)
+        self.assertEqual(math.pow(-1.9, INF), INF)
+
+        # pow(x, y) should work for x negative, y an integer
+        self.ftest('(-2.)**3.', math.pow(-2.0, 3.0), -8.0)
+        self.ftest('(-2.)**2.', math.pow(-2.0, 2.0), 4.0)
+        self.ftest('(-2.)**1.', math.pow(-2.0, 1.0), -2.0)
+        self.ftest('(-2.)**0.', math.pow(-2.0, 0.0), 1.0)
+        self.ftest('(-2.)**-0.', math.pow(-2.0, -0.0), 1.0)
+        self.ftest('(-2.)**-1.', math.pow(-2.0, -1.0), -0.5)
+        self.ftest('(-2.)**-2.', math.pow(-2.0, -2.0), 0.25)
+        self.ftest('(-2.)**-3.', math.pow(-2.0, -3.0), -0.125)
+        self.assertRaises(ValueError, math.pow, -2.0, -0.5)
+        self.assertRaises(ValueError, math.pow, -2.0, 0.5)
+
+        # the following tests have been commented out since they don't
+        # really belong here:  the implementation of ** for floats is
+        # independent of the implementation of math.pow
+        #self.assertEqual(1**NAN, 1)
+        #self.assertEqual(1**INF, 1)
+        #self.assertEqual(1**NINF, 1)
+        #self.assertEqual(1**0, 1)
+        #self.assertEqual(1.**NAN, 1)
+        #self.assertEqual(1.**INF, 1)
+        #self.assertEqual(1.**NINF, 1)
+        #self.assertEqual(1.**0, 1)
+
+    def testRadians(self):
+        self.assertRaises(TypeError, math.radians)
+        self.ftest('radians(180)', math.radians(180), math.pi)
+        self.ftest('radians(90)', math.radians(90), math.pi/2)
+        self.ftest('radians(-45)', math.radians(-45), -math.pi/4)
+        self.ftest('radians(0)', math.radians(0), 0)
+
+    # TODO Rustpython
+    # @requires_IEEE_754
+    # def testRemainder(self):
+    #     from fractions import Fraction
+
+    #     def validate_spec(x, y, r):
+    #         """
+    #         Check that r matches remainder(x, y) according to the IEEE 754
+    #         specification. Assumes that x, y and r are finite and y is nonzero.
+    #         """
+    #         fx, fy, fr = Fraction(x), Fraction(y), Fraction(r)
+    #         # r should not exceed y/2 in absolute value
+    #         self.assertLessEqual(abs(fr), abs(fy/2))
+    #         # x - r should be an exact integer multiple of y
+    #         n = (fx - fr) / fy
+    #         self.assertEqual(n, int(n))
+    #         if abs(fr) == abs(fy/2):
+    #             # If |r| == |y/2|, n should be even.
+    #             self.assertEqual(n/2, int(n/2))
+
+    #     # triples (x, y, remainder(x, y)) in hexadecimal form.
+    #     testcases = [
+    #         # Remainders modulo 1, showing the ties-to-even behaviour.
+    #         '-4.0 1 -0.0',
+    #         '-3.8 1  0.8',
+    #         '-3.0 1 -0.0',
+    #         '-2.8 1 -0.8',
+    #         '-2.0 1 -0.0',
+    #         '-1.8 1  0.8',
+    #         '-1.0 1 -0.0',
+    #         '-0.8 1 -0.8',
+    #         '-0.0 1 -0.0',
+    #         ' 0.0 1  0.0',
+    #         ' 0.8 1  0.8',
+    #         ' 1.0 1  0.0',
+    #         ' 1.8 1 -0.8',
+    #         ' 2.0 1  0.0',
+    #         ' 2.8 1  0.8',
+    #         ' 3.0 1  0.0',
+    #         ' 3.8 1 -0.8',
+    #         ' 4.0 1  0.0',
+
+    #         # Reductions modulo 2*pi
+    #         '0x0.0p+0 0x1.921fb54442d18p+2 0x0.0p+0',
+    #         '0x1.921fb54442d18p+0 0x1.921fb54442d18p+2  0x1.921fb54442d18p+0',
+    #         '0x1.921fb54442d17p+1 0x1.921fb54442d18p+2  0x1.921fb54442d17p+1',
+    #         '0x1.921fb54442d18p+1 0x1.921fb54442d18p+2  0x1.921fb54442d18p+1',
+    #         '0x1.921fb54442d19p+1 0x1.921fb54442d18p+2 -0x1.921fb54442d17p+1',
+    #         '0x1.921fb54442d17p+2 0x1.921fb54442d18p+2 -0x0.0000000000001p+2',
+    #         '0x1.921fb54442d18p+2 0x1.921fb54442d18p+2  0x0p0',
+    #         '0x1.921fb54442d19p+2 0x1.921fb54442d18p+2  0x0.0000000000001p+2',
+    #         '0x1.2d97c7f3321d1p+3 0x1.921fb54442d18p+2  0x1.921fb54442d14p+1',
+    #         '0x1.2d97c7f3321d2p+3 0x1.921fb54442d18p+2 -0x1.921fb54442d18p+1',
+    #         '0x1.2d97c7f3321d3p+3 0x1.921fb54442d18p+2 -0x1.921fb54442d14p+1',
+    #         '0x1.921fb54442d17p+3 0x1.921fb54442d18p+2 -0x0.0000000000001p+3',
+    #         '0x1.921fb54442d18p+3 0x1.921fb54442d18p+2  0x0p0',
+    #         '0x1.921fb54442d19p+3 0x1.921fb54442d18p+2  0x0.0000000000001p+3',
+    #         '0x1.f6a7a2955385dp+3 0x1.921fb54442d18p+2  0x1.921fb54442d14p+1',
+    #         '0x1.f6a7a2955385ep+3 0x1.921fb54442d18p+2  0x1.921fb54442d18p+1',
+    #         '0x1.f6a7a2955385fp+3 0x1.921fb54442d18p+2 -0x1.921fb54442d14p+1',
+    #         '0x1.1475cc9eedf00p+5 0x1.921fb54442d18p+2  0x1.921fb54442d10p+1',
+    #         '0x1.1475cc9eedf01p+5 0x1.921fb54442d18p+2 -0x1.921fb54442d10p+1',
+
+    #         # Symmetry with respect to signs.
+    #         ' 1  0.c  0.4',
+    #         '-1  0.c -0.4',
+    #         ' 1 -0.c  0.4',
+    #         '-1 -0.c -0.4',
+    #         ' 1.4  0.c -0.4',
+    #         '-1.4  0.c  0.4',
+    #         ' 1.4 -0.c -0.4',
+    #         '-1.4 -0.c  0.4',
+
+    #         # Huge modulus, to check that the underlying algorithm doesn't
+    #         # rely on 2.0 * modulus being representable.
+    #         '0x1.dp+1023 0x1.4p+1023  0x0.9p+1023',
+    #         '0x1.ep+1023 0x1.4p+1023 -0x0.ap+1023',
+    #         '0x1.fp+1023 0x1.4p+1023 -0x0.9p+1023',
+    #     ]
+
+    #     for case in testcases:
+    #         with self.subTest(case=case):
+    #             x_hex, y_hex, expected_hex = case.split()
+    #             x = float.fromhex(x_hex)
+    #             y = float.fromhex(y_hex)
+    #             expected = float.fromhex(expected_hex)
+    #             validate_spec(x, y, expected)
+    #             actual = math.remainder(x, y)
+    #             # Cheap way of checking that the floats are
+    #             # as identical as we need them to be.
+    #             self.assertEqual(actual.hex(), expected.hex())
+
+    #     # Test tiny subnormal modulus: there's potential for
+    #     # getting the implementation wrong here (for example,
+    #     # by assuming that modulus/2 is exactly representable).
+    #     tiny = float.fromhex('1p-1074')  # min +ve subnormal
+    #     for n in range(-25, 25):
+    #         if n == 0:
+    #             continue
+    #         y = n * tiny
+    #         for m in range(100):
+    #             x = m * tiny
+    #             actual = math.remainder(x, y)
+    #             validate_spec(x, y, actual)
+    #             actual = math.remainder(-x, y)
+    #             validate_spec(-x, y, actual)
+
+    #     # Special values.
+    #     # NaNs should propagate as usual.
+    #     for value in [NAN, 0.0, -0.0, 2.0, -2.3, NINF, INF]:
+    #         self.assertIsNaN(math.remainder(NAN, value))
+    #         self.assertIsNaN(math.remainder(value, NAN))
+
+    #     # remainder(x, inf) is x, for non-nan non-infinite x.
+    #     for value in [-2.3, -0.0, 0.0, 2.3]:
+    #         self.assertEqual(math.remainder(value, INF), value)
+    #         self.assertEqual(math.remainder(value, NINF), value)
+
+    #     # remainder(x, 0) and remainder(infinity, x) for non-NaN x are invalid
+    #     # operations according to IEEE 754-2008 7.2(f), and should raise.
+    #     for value in [NINF, -2.3, -0.0, 0.0, 2.3, INF]:
+    #         with self.assertRaises(ValueError):
+    #             math.remainder(INF, value)
+    #         with self.assertRaises(ValueError):
+    #             math.remainder(NINF, value)
+    #         with self.assertRaises(ValueError):
+    #             math.remainder(value, 0.0)
+    #         with self.assertRaises(ValueError):
+    #             math.remainder(value, -0.0)
+
+    def testSin(self):
+        self.assertRaises(TypeError, math.sin)
+        self.ftest('sin(0)', math.sin(0), 0)
+        self.ftest('sin(pi/2)', math.sin(math.pi/2), 1)
+        self.ftest('sin(-pi/2)', math.sin(-math.pi/2), -1)
+        try:
+            self.assertTrue(math.isnan(math.sin(INF)))
+            self.assertTrue(math.isnan(math.sin(NINF)))
+        except ValueError:
+            self.assertRaises(ValueError, math.sin, INF)
+            self.assertRaises(ValueError, math.sin, NINF)
+        self.assertTrue(math.isnan(math.sin(NAN)))
+
+    def testSinh(self):
+        self.assertRaises(TypeError, math.sinh)
+        self.ftest('sinh(0)', math.sinh(0), 0)
+        self.ftest('sinh(1)**2-cosh(1)**2', math.sinh(1)**2-math.cosh(1)**2, -1)
+        self.ftest('sinh(1)+sinh(-1)', math.sinh(1)+math.sinh(-1), 0)
+        self.assertEqual(math.sinh(INF), INF)
+        self.assertEqual(math.sinh(NINF), NINF)
+        self.assertTrue(math.isnan(math.sinh(NAN)))
+
+    @unittest.skip('TODO RustPython')
+    def testSqrt(self):
+        self.assertRaises(TypeError, math.sqrt)
+        self.ftest('sqrt(0)', math.sqrt(0), 0)
+        self.ftest('sqrt(1)', math.sqrt(1), 1)
+        self.ftest('sqrt(4)', math.sqrt(4), 2)
+        self.assertEqual(math.sqrt(INF), INF)
+        self.assertRaises(ValueError, math.sqrt, -1)
+        self.assertRaises(ValueError, math.sqrt, NINF)
+        self.assertTrue(math.isnan(math.sqrt(NAN)))
+
+    def testTan(self):
+        self.assertRaises(TypeError, math.tan)
+        self.ftest('tan(0)', math.tan(0), 0)
+        self.ftest('tan(pi/4)', math.tan(math.pi/4), 1)
+        self.ftest('tan(-pi/4)', math.tan(-math.pi/4), -1)
+        try:
+            self.assertTrue(math.isnan(math.tan(INF)))
+            self.assertTrue(math.isnan(math.tan(NINF)))
+        except:
+            self.assertRaises(ValueError, math.tan, INF)
+            self.assertRaises(ValueError, math.tan, NINF)
+        self.assertTrue(math.isnan(math.tan(NAN)))
+
+    @unittest.skip('TODO RustPython')
+    def testTanh(self):
+        self.assertRaises(TypeError, math.tanh)
+        self.ftest('tanh(0)', math.tanh(0), 0)
+        self.ftest('tanh(1)+tanh(-1)', math.tanh(1)+math.tanh(-1), 0,
+                   abs_tol=math.ulp(1))
+        self.ftest('tanh(inf)', math.tanh(INF), 1)
+        self.ftest('tanh(-inf)', math.tanh(NINF), -1)
+        self.assertTrue(math.isnan(math.tanh(NAN)))
+
+    # TODO Rustpython
+    # @requires_IEEE_754
+    # def testTanhSign(self):
+    #     # check that tanh(-0.) == -0. on IEEE 754 systems
+    #     self.assertEqual(math.tanh(-0.), -0.)
+    #     self.assertEqual(math.copysign(1., math.tanh(-0.)),
+    #                      math.copysign(1., -0.))
+
+    def test_trunc(self):
+        self.assertEqual(math.trunc(1), 1)
+        self.assertEqual(math.trunc(-1), -1)
+        self.assertEqual(type(math.trunc(1)), int)
+        self.assertEqual(type(math.trunc(1.5)), int)
+        self.assertEqual(math.trunc(1.5), 1)
+        self.assertEqual(math.trunc(-1.5), -1)
+        self.assertEqual(math.trunc(1.999999), 1)
+        self.assertEqual(math.trunc(-1.999999), -1)
+        self.assertEqual(math.trunc(-0.999999), -0)
+        self.assertEqual(math.trunc(-100.999), -100)
+
+        class TestTrunc:
+            def __trunc__(self):
+                return 23
+        class FloatTrunc(float):
+            def __trunc__(self):
+                return 23
+        class TestNoTrunc:
+            pass
+
+        self.assertEqual(math.trunc(TestTrunc()), 23)
+        self.assertEqual(math.trunc(FloatTrunc()), 23)
+
+        self.assertRaises(TypeError, math.trunc)
+        self.assertRaises(TypeError, math.trunc, 1, 2)
+        self.assertRaises(TypeError, math.trunc, FloatLike(23.5))
+        self.assertRaises(TypeError, math.trunc, TestNoTrunc())
+
+    def testIsfinite(self):
+        self.assertTrue(math.isfinite(0.0))
+        self.assertTrue(math.isfinite(-0.0))
+        self.assertTrue(math.isfinite(1.0))
+        self.assertTrue(math.isfinite(-1.0))
+        self.assertFalse(math.isfinite(float("nan")))
+        self.assertFalse(math.isfinite(float("inf")))
+        self.assertFalse(math.isfinite(float("-inf")))
+
+    def testIsnan(self):
+        self.assertTrue(math.isnan(float("nan")))
+        self.assertTrue(math.isnan(float("-nan")))
+        self.assertTrue(math.isnan(float("inf") * 0.))
+        self.assertFalse(math.isnan(float("inf")))
+        self.assertFalse(math.isnan(0.))
+        self.assertFalse(math.isnan(1.))
+
+    def testIsinf(self):
+        self.assertTrue(math.isinf(float("inf")))
+        self.assertTrue(math.isinf(float("-inf")))
+        self.assertTrue(math.isinf(1E400))
+        self.assertTrue(math.isinf(-1E400))
+        self.assertFalse(math.isinf(float("nan")))
+        self.assertFalse(math.isinf(0.))
+        self.assertFalse(math.isinf(1.))
+
+    # TODO Rustpython
+    # @requires_IEEE_754
+    # def test_nan_constant(self):
+    #     self.assertTrue(math.isnan(math.nan))
+
+    # TODO Rustpython
+    # @requires_IEEE_754
+    # def test_inf_constant(self):
+    #     self.assertTrue(math.isinf(math.inf))
+    #     self.assertGreater(math.inf, 0.0)
+    #     self.assertEqual(math.inf, float("inf"))
+    #     self.assertEqual(-math.inf, float("-inf"))
+
+    # RED_FLAG 16-Oct-2000 Tim
+    # While 2.0 is more consistent about exceptions than previous releases, it
+    # still fails this part of the test on some platforms.  For now, we only
+    # *run* test_exceptions() in verbose mode, so that this isn't normally
+    # tested.
+    @unittest.skip('TODO RustPython')
+    @unittest.skipUnless(verbose, 'requires verbose mode')
+    def test_exceptions(self):
+        try:
+            x = math.exp(-1000000000)
+        except:
+            # mathmodule.c is failing to weed out underflows from libm, or
+            # we've got an fp format with huge dynamic range
+            self.fail("underflowing exp() should not have raised "
+                        "an exception")
+        if x != 0:
+            self.fail("underflowing exp() should have returned 0")
+
+        # If this fails, probably using a strict IEEE-754 conforming libm, and x
+        # is +Inf afterwards.  But Python wants overflows detected by default.
+        try:
+            x = math.exp(1000000000)
+        except OverflowError:
+            pass
+        else:
+            self.fail("overflowing exp() didn't trigger OverflowError")
+
+        # If this fails, it could be a puzzle.  One odd possibility is that
+        # mathmodule.c's macros are getting confused while comparing
+        # Inf (HUGE_VAL) to a NaN, and artificially setting errno to ERANGE
+        # as a result (and so raising OverflowError instead).
+        try:
+            x = math.sqrt(-1.0)
+        except ValueError:
+            pass
+        else:
+            self.fail("sqrt(-1) didn't raise ValueError")
+
+    # TODO Rustpython
+    # @requires_IEEE_754
+    # def test_testfile(self):
+    #     # Some tests need to be skipped on ancient OS X versions.
+    #     # See issue #27953.
+    #     SKIP_ON_TIGER = {'tan0064'}
+
+    #     osx_version = None
+    #     if sys.platform == 'darwin':
+    #         version_txt = platform.mac_ver()[0]
+    #         try:
+    #             osx_version = tuple(map(int, version_txt.split('.')))
+    #         except ValueError:
+    #             pass
+
+    #     fail_fmt = "{}: {}({!r}): {}"
+
+    #     failures = []
+    #     for id, fn, ar, ai, er, ei, flags in parse_testfile(test_file):
+    #         # Skip if either the input or result is complex
+    #         if ai != 0.0 or ei != 0.0:
+    #             continue
+    #         if fn in ['rect', 'polar']:
+    #             # no real versions of rect, polar
+    #             continue
+    #         # Skip certain tests on OS X 10.4.
+    #         if osx_version is not None and osx_version < (10, 5):
+    #             if id in SKIP_ON_TIGER:
+    #                 continue
+
+    #         func = getattr(math, fn)
+
+    #         if 'invalid' in flags or 'divide-by-zero' in flags:
+    #             er = 'ValueError'
+    #         elif 'overflow' in flags:
+    #             er = 'OverflowError'
+
+    #         try:
+    #             result = func(ar)
+    #         except ValueError:
+    #             result = 'ValueError'
+    #         except OverflowError:
+    #             result = 'OverflowError'
+
+    #         # Default tolerances
+    #         ulp_tol, abs_tol = 5, 0.0
+
+    #         failure = result_check(er, result, ulp_tol, abs_tol)
+    #         if failure is None:
+    #             continue
+
+    #         msg = fail_fmt.format(id, fn, ar, failure)
+    #         failures.append(msg)
+
+    #     if failures:
+    #         self.fail('Failures in test_testfile:\n  ' +
+    #                   '\n  '.join(failures))
+
+    # TODO Rustpython
+    # @requires_IEEE_754
+    # def test_mtestfile(self):
+    #     fail_fmt = "{}: {}({!r}): {}"
+
+    #     failures = []
+    #     for id, fn, arg, expected, flags in parse_mtestfile(math_testcases):
+    #         func = getattr(math, fn)
+
+    #         if 'invalid' in flags or 'divide-by-zero' in flags:
+    #             expected = 'ValueError'
+    #         elif 'overflow' in flags:
+    #             expected = 'OverflowError'
+
+    #         try:
+    #             got = func(arg)
+    #         except ValueError:
+    #             got = 'ValueError'
+    #         except OverflowError:
+    #             got = 'OverflowError'
+
+    #         # Default tolerances
+    #         ulp_tol, abs_tol = 5, 0.0
+
+    #         # Exceptions to the defaults
+    #         if fn == 'gamma':
+    #             # Experimental results on one platform gave
+    #             # an accuracy of <= 10 ulps across the entire float
+    #             # domain. We weaken that to require 20 ulp accuracy.
+    #             ulp_tol = 20
+
+    #         elif fn == 'lgamma':
+    #             # we use a weaker accuracy test for lgamma;
+    #             # lgamma only achieves an absolute error of
+    #             # a few multiples of the machine accuracy, in
+    #             # general.
+    #             abs_tol = 1e-15
+
+    #         elif fn == 'erfc' and arg >= 0.0:
+    #             # erfc has less-than-ideal accuracy for large
+    #             # arguments (x ~ 25 or so), mainly due to the
+    #             # error involved in computing exp(-x*x).
+    #             #
+    #             # Observed between CPython and mpmath at 25 dp:
+    #             #       x <  0 : err <= 2 ulp
+    #             #  0 <= x <  1 : err <= 10 ulp
+    #             #  1 <= x < 10 : err <= 100 ulp
+    #             # 10 <= x < 20 : err <= 300 ulp
+    #             # 20 <= x      : < 600 ulp
+    #             #
+    #             if arg < 1.0:
+    #                 ulp_tol = 10
+    #             elif arg < 10.0:
+    #                 ulp_tol = 100
+    #             else:
+    #                 ulp_tol = 1000
+
+    #         failure = result_check(expected, got, ulp_tol, abs_tol)
+    #         if failure is None:
+    #             continue
+
+    #         msg = fail_fmt.format(id, fn, arg, failure)
+    #         failures.append(msg)
+
+    #     if failures:
+    #         self.fail('Failures in test_mtestfile:\n  ' +
+    #                   '\n  '.join(failures))
+
+    @unittest.skip('TODO RustPython')
+    def test_prod(self):
+        prod = math.prod
+        self.assertEqual(prod([]), 1)
+        self.assertEqual(prod([], start=5), 5)
+        self.assertEqual(prod(list(range(2,8))), 5040)
+        self.assertEqual(prod(iter(list(range(2,8)))), 5040)
+        self.assertEqual(prod(range(1, 10), start=10), 3628800)
+
+        self.assertEqual(prod([1, 2, 3, 4, 5]), 120)
+        self.assertEqual(prod([1.0, 2.0, 3.0, 4.0, 5.0]), 120.0)
+        self.assertEqual(prod([1, 2, 3, 4.0, 5.0]), 120.0)
+        self.assertEqual(prod([1.0, 2.0, 3.0, 4, 5]), 120.0)
+
+        # Test overflow in fast-path for integers
+        self.assertEqual(prod([1, 1, 2**32, 1, 1]), 2**32)
+        # Test overflow in fast-path for floats
+        self.assertEqual(prod([1.0, 1.0, 2**32, 1, 1]), float(2**32))
+
+        self.assertRaises(TypeError, prod)
+        self.assertRaises(TypeError, prod, 42)
+        self.assertRaises(TypeError, prod, ['a', 'b', 'c'])
+        self.assertRaises(TypeError, prod, ['a', 'b', 'c'], '')
+        self.assertRaises(TypeError, prod, [b'a', b'c'], b'')
+        values = [bytearray(b'a'), bytearray(b'b')]
+        self.assertRaises(TypeError, prod, values, bytearray(b''))
+        self.assertRaises(TypeError, prod, [[1], [2], [3]])
+        self.assertRaises(TypeError, prod, [{2:3}])
+        self.assertRaises(TypeError, prod, [{2:3}]*2, {2:3})
+        self.assertRaises(TypeError, prod, [[1], [2], [3]], [])
+        with self.assertRaises(TypeError):
+            prod([10, 20], [30, 40])     # start is a keyword-only argument
+
+        self.assertEqual(prod([0, 1, 2, 3]), 0)
+        self.assertEqual(prod([1, 0, 2, 3]), 0)
+        self.assertEqual(prod([1, 2, 3, 0]), 0)
+
+        def _naive_prod(iterable, start=1):
+            for elem in iterable:
+                start *= elem
+            return start
+
+        # Big integers
+
+        iterable = range(1, 10000)
+        self.assertEqual(prod(iterable), _naive_prod(iterable))
+        iterable = range(-10000, -1)
+        self.assertEqual(prod(iterable), _naive_prod(iterable))
+        iterable = range(-1000, 1000)
+        self.assertEqual(prod(iterable), 0)
+
+        # Big floats
+
+        iterable = [float(x) for x in range(1, 1000)]
+        self.assertEqual(prod(iterable), _naive_prod(iterable))
+        iterable = [float(x) for x in range(-1000, -1)]
+        self.assertEqual(prod(iterable), _naive_prod(iterable))
+        iterable = [float(x) for x in range(-1000, 1000)]
+        self.assertIsNaN(prod(iterable))
+
+        # Float tests
+
+        self.assertIsNaN(prod([1, 2, 3, float("nan"), 2, 3]))
+        self.assertIsNaN(prod([1, 0, float("nan"), 2, 3]))
+        self.assertIsNaN(prod([1, float("nan"), 0, 3]))
+        self.assertIsNaN(prod([1, float("inf"), float("nan"),3]))
+        self.assertIsNaN(prod([1, float("-inf"), float("nan"),3]))
+        self.assertIsNaN(prod([1, float("nan"), float("inf"),3]))
+        self.assertIsNaN(prod([1, float("nan"), float("-inf"),3]))
+
+        self.assertEqual(prod([1, 2, 3, float('inf'),-3,4]), float('-inf'))
+        self.assertEqual(prod([1, 2, 3, float('-inf'),-3,4]), float('inf'))
+
+        self.assertIsNaN(prod([1,2,0,float('inf'), -3, 4]))
+        self.assertIsNaN(prod([1,2,0,float('-inf'), -3, 4]))
+        self.assertIsNaN(prod([1, 2, 3, float('inf'), -3, 0, 3]))
+        self.assertIsNaN(prod([1, 2, 3, float('-inf'), -3, 0, 2]))
+
+        # Type preservation
+
+        self.assertEqual(type(prod([1, 2, 3, 4, 5, 6])), int)
+        self.assertEqual(type(prod([1, 2.0, 3, 4, 5, 6])), float)
+        self.assertEqual(type(prod(range(1, 10000))), int)
+        self.assertEqual(type(prod(range(1, 10000), start=1.0)), float)
+        self.assertEqual(type(prod([1, decimal.Decimal(2.0), 3, 4, 5, 6])),
+                         decimal.Decimal)
+
+    @unittest.skip('TODO RustPython')
+    def testPerm(self):
+        perm = math.perm
+        factorial = math.factorial
+        # Test if factorial definition is satisfied
+        for n in range(100):
+            for k in range(n + 1):
+                self.assertEqual(perm(n, k),
+                                 factorial(n) // factorial(n - k))
+
+        # Test for Pascal's identity
+        for n in range(1, 100):
+            for k in range(1, n):
+                self.assertEqual(perm(n, k), perm(n - 1, k - 1) * k + perm(n - 1, k))
+
+        # Test corner cases
+        for n in range(1, 100):
+            self.assertEqual(perm(n, 0), 1)
+            self.assertEqual(perm(n, 1), n)
+            self.assertEqual(perm(n, n), factorial(n))
+
+        # Test one argument form
+        for n in range(20):
+            self.assertEqual(perm(n), factorial(n))
+            self.assertEqual(perm(n, None), factorial(n))
+
+        # Raises TypeError if any argument is non-integer or argument count is
+        # not 1 or 2
+        self.assertRaises(TypeError, perm, 10, 1.0)
+        self.assertRaises(TypeError, perm, 10, decimal.Decimal(1.0))
+        self.assertRaises(TypeError, perm, 10, "1")
+        self.assertRaises(TypeError, perm, 10.0, 1)
+        self.assertRaises(TypeError, perm, decimal.Decimal(10.0), 1)
+        self.assertRaises(TypeError, perm, "10", 1)
+
+        self.assertRaises(TypeError, perm)
+        self.assertRaises(TypeError, perm, 10, 1, 3)
+        self.assertRaises(TypeError, perm)
+
+        # Raises Value error if not k or n are negative numbers
+        self.assertRaises(ValueError, perm, -1, 1)
+        self.assertRaises(ValueError, perm, -2**1000, 1)
+        self.assertRaises(ValueError, perm, 1, -1)
+        self.assertRaises(ValueError, perm, 1, -2**1000)
+
+        # Returns zero if k is greater than n
+        self.assertEqual(perm(1, 2), 0)
+        self.assertEqual(perm(1, 2**1000), 0)
+
+        n = 2**1000
+        self.assertEqual(perm(n, 0), 1)
+        self.assertEqual(perm(n, 1), n)
+        self.assertEqual(perm(n, 2), n * (n-1))
+        if support.check_impl_detail(cpython=True):
+            self.assertRaises(OverflowError, perm, n, n)
+
+        for n, k in (True, True), (True, False), (False, False):
+            self.assertEqual(perm(n, k), 1)
+            self.assertIs(type(perm(n, k)), int)
+        self.assertEqual(perm(IntSubclass(5), IntSubclass(2)), 20)
+        self.assertEqual(perm(MyIndexable(5), MyIndexable(2)), 20)
+        for k in range(3):
+            self.assertIs(type(perm(IntSubclass(5), IntSubclass(k))), int)
+            self.assertIs(type(perm(MyIndexable(5), MyIndexable(k))), int)
+
+    @unittest.skip('TODO RustPython')
+    def testComb(self):
+        comb = math.comb
+        factorial = math.factorial
+        # Test if factorial definition is satisfied
+        for n in range(100):
+            for k in range(n + 1):
+                self.assertEqual(comb(n, k), factorial(n)
+                    // (factorial(k) * factorial(n - k)))
+
+        # Test for Pascal's identity
+        for n in range(1, 100):
+            for k in range(1, n):
+                self.assertEqual(comb(n, k), comb(n - 1, k - 1) + comb(n - 1, k))
+
+        # Test corner cases
+        for n in range(100):
+            self.assertEqual(comb(n, 0), 1)
+            self.assertEqual(comb(n, n), 1)
+
+        for n in range(1, 100):
+            self.assertEqual(comb(n, 1), n)
+            self.assertEqual(comb(n, n - 1), n)
+
+        # Test Symmetry
+        for n in range(100):
+            for k in range(n // 2):
+                self.assertEqual(comb(n, k), comb(n, n - k))
+
+        # Raises TypeError if any argument is non-integer or argument count is
+        # not 2
+        self.assertRaises(TypeError, comb, 10, 1.0)
+        self.assertRaises(TypeError, comb, 10, decimal.Decimal(1.0))
+        self.assertRaises(TypeError, comb, 10, "1")
+        self.assertRaises(TypeError, comb, 10.0, 1)
+        self.assertRaises(TypeError, comb, decimal.Decimal(10.0), 1)
+        self.assertRaises(TypeError, comb, "10", 1)
+
+        self.assertRaises(TypeError, comb, 10)
+        self.assertRaises(TypeError, comb, 10, 1, 3)
+        self.assertRaises(TypeError, comb)
+
+        # Raises Value error if not k or n are negative numbers
+        self.assertRaises(ValueError, comb, -1, 1)
+        self.assertRaises(ValueError, comb, -2**1000, 1)
+        self.assertRaises(ValueError, comb, 1, -1)
+        self.assertRaises(ValueError, comb, 1, -2**1000)
+
+        # Returns zero if k is greater than n
+        self.assertEqual(comb(1, 2), 0)
+        self.assertEqual(comb(1, 2**1000), 0)
+
+        n = 2**1000
+        self.assertEqual(comb(n, 0), 1)
+        self.assertEqual(comb(n, 1), n)
+        self.assertEqual(comb(n, 2), n * (n-1) // 2)
+        self.assertEqual(comb(n, n), 1)
+        self.assertEqual(comb(n, n-1), n)
+        self.assertEqual(comb(n, n-2), n * (n-1) // 2)
+        if support.check_impl_detail(cpython=True):
+            self.assertRaises(OverflowError, comb, n, n//2)
+
+        for n, k in (True, True), (True, False), (False, False):
+            self.assertEqual(comb(n, k), 1)
+            self.assertIs(type(comb(n, k)), int)
+        self.assertEqual(comb(IntSubclass(5), IntSubclass(2)), 10)
+        self.assertEqual(comb(MyIndexable(5), MyIndexable(2)), 10)
+        for k in range(3):
+            self.assertIs(type(comb(IntSubclass(5), IntSubclass(k))), int)
+            self.assertIs(type(comb(MyIndexable(5), MyIndexable(k))), int)
+
+    # TODO Rustpython
+    # @requires_IEEE_754
+    # def test_nextafter(self):
+    #     # around 2^52 and 2^63
+    #     self.assertEqual(math.nextafter(4503599627370496.0, -INF),
+    #                      4503599627370495.5)
+    #     self.assertEqual(math.nextafter(4503599627370496.0, INF),
+    #                      4503599627370497.0)
+    #     self.assertEqual(math.nextafter(9223372036854775808.0, 0.0),
+    #                      9223372036854774784.0)
+    #     self.assertEqual(math.nextafter(-9223372036854775808.0, 0.0),
+    #                      -9223372036854774784.0)
+
+    #     # around 1.0
+    #     self.assertEqual(math.nextafter(1.0, -INF),
+    #                      float.fromhex('0x1.fffffffffffffp-1'))
+    #     self.assertEqual(math.nextafter(1.0, INF),
+    #                      float.fromhex('0x1.0000000000001p+0'))
+
+    #     # x == y: y is returned
+    #     self.assertEqual(math.nextafter(2.0, 2.0), 2.0)
+    #     self.assertEqualSign(math.nextafter(-0.0, +0.0), +0.0)
+    #     self.assertEqualSign(math.nextafter(+0.0, -0.0), -0.0)
+
+    #     # around 0.0
+    #     smallest_subnormal = sys.float_info.min * sys.float_info.epsilon
+    #     self.assertEqual(math.nextafter(+0.0, INF), smallest_subnormal)
+    #     self.assertEqual(math.nextafter(-0.0, INF), smallest_subnormal)
+    #     self.assertEqual(math.nextafter(+0.0, -INF), -smallest_subnormal)
+    #     self.assertEqual(math.nextafter(-0.0, -INF), -smallest_subnormal)
+    #     self.assertEqualSign(math.nextafter(smallest_subnormal, +0.0), +0.0)
+    #     self.assertEqualSign(math.nextafter(-smallest_subnormal, +0.0), -0.0)
+    #     self.assertEqualSign(math.nextafter(smallest_subnormal, -0.0), +0.0)
+    #     self.assertEqualSign(math.nextafter(-smallest_subnormal, -0.0), -0.0)
+
+    #     # around infinity
+    #     largest_normal = sys.float_info.max
+    #     self.assertEqual(math.nextafter(INF, 0.0), largest_normal)
+    #     self.assertEqual(math.nextafter(-INF, 0.0), -largest_normal)
+    #     self.assertEqual(math.nextafter(largest_normal, INF), INF)
+    #     self.assertEqual(math.nextafter(-largest_normal, -INF), -INF)
+
+    #     # NaN
+    #     self.assertIsNaN(math.nextafter(NAN, 1.0))
+    #     self.assertIsNaN(math.nextafter(1.0, NAN))
+    #     self.assertIsNaN(math.nextafter(NAN, NAN))
+
+    # @requires_IEEE_754
+    # def test_ulp(self):
+    #     self.assertEqual(math.ulp(1.0), sys.float_info.epsilon)
+    #     # use int ** int rather than float ** int to not rely on pow() accuracy
+    #     self.assertEqual(math.ulp(2 ** 52), 1.0)
+    #     self.assertEqual(math.ulp(2 ** 53), 2.0)
+    #     self.assertEqual(math.ulp(2 ** 64), 4096.0)
+
+    #     # min and max
+    #     self.assertEqual(math.ulp(0.0),
+    #                      sys.float_info.min * sys.float_info.epsilon)
+    #     self.assertEqual(math.ulp(FLOAT_MAX),
+    #                      FLOAT_MAX - math.nextafter(FLOAT_MAX, -INF))
+
+    #     # special cases
+    #     self.assertEqual(math.ulp(INF), INF)
+    #     self.assertIsNaN(math.ulp(math.nan))
+
+    #     # negative number: ulp(-x) == ulp(x)
+    #     for x in (0.0, 1.0, 2 ** 52, 2 ** 64, INF):
+    #         with self.subTest(x=x):
+    #             self.assertEqual(math.ulp(-x), math.ulp(x))
+
+    @unittest.skip('TODO RustPython')
+    def test_issue39871(self):
+        # A SystemError should not be raised if the first arg to atan2(),
+        # copysign(), or remainder() cannot be converted to a float.
+        class F:
+            def __float__(self):
+                self.converted = True
+                1/0
+        for func in math.atan2, math.copysign, math.remainder:
+            y = F()
+            with self.assertRaises(TypeError):
+                func("not a number", y)
+
+            # There should not have been any attempt to convert the second
+            # argument to a float.
+            self.assertFalse(getattr(y, "converted", False))
+
+    # Custom assertions.
+
+    def assertIsNaN(self, value):
+        if not math.isnan(value):
+            self.fail("Expected a NaN, got {!r}.".format(value))
+
+    def assertEqualSign(self, x, y):
+        """Similar to assertEqual(), but compare also the sign with copysign().
+        Function useful to compare signed zeros.
+        """
+        self.assertEqual(x, y)
+        self.assertEqual(math.copysign(1.0, x), math.copysign(1.0, y))
+
+
+class IsCloseTests(unittest.TestCase):
+    isclose = math.isclose  # subclasses should override this
+
+    def assertIsClose(self, a, b, *args, **kwargs):
+        self.assertTrue(self.isclose(a, b, *args, **kwargs),
+                        msg="%s and %s should be close!" % (a, b))
+
+    def assertIsNotClose(self, a, b, *args, **kwargs):
+        self.assertFalse(self.isclose(a, b, *args, **kwargs),
+                         msg="%s and %s should not be close!" % (a, b))
+
+    def assertAllClose(self, examples, *args, **kwargs):
+        for a, b in examples:
+            self.assertIsClose(a, b, *args, **kwargs)
+
+    def assertAllNotClose(self, examples, *args, **kwargs):
+        for a, b in examples:
+            self.assertIsNotClose(a, b, *args, **kwargs)
+
+    def test_negative_tolerances(self):
+        # ValueError should be raised if either tolerance is less than zero
+        with self.assertRaises(ValueError):
+            self.assertIsClose(1, 1, rel_tol=-1e-100)
+        with self.assertRaises(ValueError):
+            self.assertIsClose(1, 1, rel_tol=1e-100, abs_tol=-1e10)
+
+    def test_identical(self):
+        # identical values must test as close
+        identical_examples = [(2.0, 2.0),
+                              (0.1e200, 0.1e200),
+                              (1.123e-300, 1.123e-300),
+                              (12345, 12345.0),
+                              (0.0, -0.0),
+                              (345678, 345678)]
+        self.assertAllClose(identical_examples, rel_tol=0.0, abs_tol=0.0)
+
+    def test_eight_decimal_places(self):
+        # examples that are close to 1e-8, but not 1e-9
+        eight_decimal_places_examples = [(1e8, 1e8 + 1),
+                                         (-1e-8, -1.000000009e-8),
+                                         (1.12345678, 1.12345679)]
+        self.assertAllClose(eight_decimal_places_examples, rel_tol=1e-8)
+        self.assertAllNotClose(eight_decimal_places_examples, rel_tol=1e-9)
+
+    def test_near_zero(self):
+        # values close to zero
+        near_zero_examples = [(1e-9, 0.0),
+                              (-1e-9, 0.0),
+                              (-1e-150, 0.0)]
+        # these should not be close to any rel_tol
+        self.assertAllNotClose(near_zero_examples, rel_tol=0.9)
+        # these should be close to abs_tol=1e-8
+        self.assertAllClose(near_zero_examples, abs_tol=1e-8)
+
+    def test_identical_infinite(self):
+        # these are close regardless of tolerance -- i.e. they are equal
+        self.assertIsClose(INF, INF)
+        self.assertIsClose(INF, INF, abs_tol=0.0)
+        self.assertIsClose(NINF, NINF)
+        self.assertIsClose(NINF, NINF, abs_tol=0.0)
+
+    def test_inf_ninf_nan(self):
+        # these should never be close (following IEEE 754 rules for equality)
+        not_close_examples = [(NAN, NAN),
+                              (NAN, 1e-100),
+                              (1e-100, NAN),
+                              (INF, NAN),
+                              (NAN, INF),
+                              (INF, NINF),
+                              (INF, 1.0),
+                              (1.0, INF),
+                              (INF, 1e308),
+                              (1e308, INF)]
+        # use largest reasonable tolerance
+        self.assertAllNotClose(not_close_examples, abs_tol=0.999999999999999)
+
+    def test_zero_tolerance(self):
+        # test with zero tolerance
+        zero_tolerance_close_examples = [(1.0, 1.0),
+                                         (-3.4, -3.4),
+                                         (-1e-300, -1e-300)]
+        self.assertAllClose(zero_tolerance_close_examples, rel_tol=0.0)
+
+        zero_tolerance_not_close_examples = [(1.0, 1.000000000000001),
+                                             (0.99999999999999, 1.0),
+                                             (1.0e200, .999999999999999e200)]
+        self.assertAllNotClose(zero_tolerance_not_close_examples, rel_tol=0.0)
+
+    def test_asymmetry(self):
+        # test the asymmetry example from PEP 485
+        self.assertAllClose([(9, 10), (10, 9)], rel_tol=0.1)
+
+    def test_integers(self):
+        # test with integer values
+        integer_examples = [(100000001, 100000000),
+                            (123456789, 123456788)]
+
+        self.assertAllClose(integer_examples, rel_tol=1e-8)
+        self.assertAllNotClose(integer_examples, rel_tol=1e-9)
+
+    @unittest.skip('TODO RustPython')
+    def test_decimals(self):
+        # test with Decimal values
+        from decimal import Decimal
+
+        decimal_examples = [(Decimal('1.00000001'), Decimal('1.0')),
+                            (Decimal('1.00000001e-20'), Decimal('1.0e-20')),
+                            (Decimal('1.00000001e-100'), Decimal('1.0e-100')),
+                            (Decimal('1.00000001e20'), Decimal('1.0e20'))]
+        self.assertAllClose(decimal_examples, rel_tol=1e-8)
+        self.assertAllNotClose(decimal_examples, rel_tol=1e-9)
+
+    @unittest.skip('TODO Rustpython')
+    def test_fractions(self):
+        # test with Fraction values
+        from fractions import Fraction
+
+        fraction_examples = [
+            (Fraction(1, 100000000) + 1, Fraction(1)),
+            (Fraction(100000001), Fraction(100000000)),
+            (Fraction(10**8 + 1, 10**28), Fraction(1, 10**20))]
+        self.assertAllClose(fraction_examples, rel_tol=1e-8)
+        self.assertAllNotClose(fraction_examples, rel_tol=1e-9)
+
+
+def test_main():
+    # from doctest import DocFileSuite
+    suite = unittest.TestSuite()
+    suite.addTest(unittest.makeSuite(MathTests))
+    suite.addTest(unittest.makeSuite(IsCloseTests))
+    # suite.addTest(DocFileSuite("ieee754.txt"))
+    run_unittest(suite)
+
+if __name__ == '__main__':
+    test_main()
\ No newline at end of file
diff --git a/vm/src/stdlib/math.rs b/vm/src/stdlib/math.rs
index 6873e4352e..cb2c812cab 100644
--- a/vm/src/stdlib/math.rs
+++ b/vm/src/stdlib/math.rs
@@ -9,9 +9,9 @@ use statrs::function::gamma::{gamma, ln_gamma};
 use num_bigint::BigInt;
 use num_traits::{One, Zero};
 
-use crate::function::OptionalArg;
+use crate::function::{Args, OptionalArg};
 use crate::obj::objfloat::{self, IntoPyFloat, PyFloatRef};
-use crate::obj::objint::{self, PyIntRef};
+use crate::obj::objint::{self, PyInt, PyIntRef};
 use crate::obj::objtype;
 use crate::pyobject::{Either, PyObjectRef, PyResult, TypeProtocol};
 use crate::vm::VirtualMachine;
@@ -272,9 +272,33 @@ fn math_ldexp(
     Ok(value * (2_f64).powf(objint::try_float(i.as_bigint(), vm)?))
 }
 
-fn math_gcd(a: PyIntRef, b: PyIntRef) -> BigInt {
+fn math_perf_arb_len_int_op<F>(args: Args<PyIntRef>, op: F, default: BigInt) -> BigInt
+where
+    F: Fn(&BigInt, &PyInt) -> BigInt,
+{
+    let argvec = args.into_vec();
+
+    if argvec.is_empty() {
+        return default;
+    } else if argvec.len() == 1 {
+        return op(argvec[0].as_bigint(), &argvec[0]);
+    }
+
+    let mut res = argvec[0].as_bigint().clone();
+    for num in argvec[1..].iter() {
+        res = op(&res, &num)
+    }
+    res
+}
+
+fn math_gcd(args: Args<PyIntRef>) -> BigInt {
+    use num_integer::Integer;
+    math_perf_arb_len_int_op(args, |x, y| x.gcd(y.as_bigint()), BigInt::zero())
+}
+
+fn math_lcm(args: Args<PyIntRef>) -> BigInt {
     use num_integer::Integer;
-    a.as_bigint().gcd(b.as_bigint())
+    math_perf_arb_len_int_op(args, |x, y| x.lcm(y.as_bigint()), BigInt::one())
 }
 
 fn math_factorial(value: PyIntRef, vm: &VirtualMachine) -> PyResult<BigInt> {
@@ -436,6 +460,7 @@ pub fn make_module(vm: &VirtualMachine) -> PyObjectRef {
 
         // Gcd function
         "gcd" => ctx.new_function(math_gcd),
+        "lcm" => ctx.new_function(math_lcm),
 
         // Factorial function
         "factorial" => ctx.new_function(math_factorial),