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[3.12] gh-111765: Move old PyFloat_* tests to Lib/test/test_capi/test_float.py (GH-111766) #111818

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Merged
merged 1 commit into from
Nov 7, 2023
+65 −65
Merged

[3.12] gh-111765: Move old PyFloat_* tests to Lib/test/test_capi/test_float.py (GH-111766) #111818

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65 changes: 65 additions & 0 deletions Lib/test/test_capi/test_float.py
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Original file line number Diff line number Diff line change
Expand Up @@ -12,6 +12,19 @@

NULL = None

# For PyFloat_Pack/Unpack*
BIG_ENDIAN = 0
LITTLE_ENDIAN = 1
EPSILON = {
2: 2.0 ** -11, # binary16
4: 2.0 ** -24, # binary32
8: 2.0 ** -53, # binary64
}

HAVE_IEEE_754 = float.__getformat__("double").startswith("IEEE")
INF = float("inf")
NAN = float("nan")


class CAPIFloatTest(unittest.TestCase):
def test_check(self):
Expand Down Expand Up @@ -112,6 +125,58 @@ def test_getmin(self):

self.assertEqual(getmin(), sys.float_info.min)

def test_pack(self):
# Test PyFloat_Pack2(), PyFloat_Pack4() and PyFloat_Pack8()
pack = _testcapi.float_pack

self.assertEqual(pack(2, 1.5, BIG_ENDIAN), b'>\x00')
self.assertEqual(pack(4, 1.5, BIG_ENDIAN), b'?\xc0\x00\x00')
self.assertEqual(pack(8, 1.5, BIG_ENDIAN),
b'?\xf8\x00\x00\x00\x00\x00\x00')
self.assertEqual(pack(2, 1.5, LITTLE_ENDIAN), b'\x00>')
self.assertEqual(pack(4, 1.5, LITTLE_ENDIAN), b'\x00\x00\xc0?')
self.assertEqual(pack(8, 1.5, LITTLE_ENDIAN),
b'\x00\x00\x00\x00\x00\x00\xf8?')

def test_unpack(self):
# Test PyFloat_Unpack2(), PyFloat_Unpack4() and PyFloat_Unpack8()
unpack = _testcapi.float_unpack

self.assertEqual(unpack(b'>\x00', BIG_ENDIAN), 1.5)
self.assertEqual(unpack(b'?\xc0\x00\x00', BIG_ENDIAN), 1.5)
self.assertEqual(unpack(b'?\xf8\x00\x00\x00\x00\x00\x00', BIG_ENDIAN),
1.5)
self.assertEqual(unpack(b'\x00>', LITTLE_ENDIAN), 1.5)
self.assertEqual(unpack(b'\x00\x00\xc0?', LITTLE_ENDIAN), 1.5)
self.assertEqual(unpack(b'\x00\x00\x00\x00\x00\x00\xf8?', LITTLE_ENDIAN),
1.5)

def test_pack_unpack_roundtrip(self):
pack = _testcapi.float_pack
unpack = _testcapi.float_unpack

large = 2.0 ** 100
values = [1.0, 1.5, large, 1.0/7, math.pi]
if HAVE_IEEE_754:
values.extend((INF, NAN))
for value in values:
for size in (2, 4, 8,):
if size == 2 and value == large:
# too large for 16-bit float
continue
rel_tol = EPSILON[size]
for endian in (BIG_ENDIAN, LITTLE_ENDIAN):
with self.subTest(value=value, size=size, endian=endian):
data = pack(size, value, endian)
value2 = unpack(data, endian)
if math.isnan(value):
self.assertTrue(math.isnan(value2), (value, value2))
elif size < 8:
self.assertTrue(math.isclose(value2, value, rel_tol=rel_tol),
(value, value2))
else:
self.assertEqual(value2, value)


if __name__ == "__main__":
unittest.main()
65 changes: 0 additions & 65 deletions Lib/test/test_float.py
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Original file line number Diff line number Diff line change
Expand Up @@ -18,7 +18,6 @@
except ImportError:
_testcapi = None

HAVE_IEEE_754 = float.__getformat__("double").startswith("IEEE")
INF = float("inf")
NAN = float("nan")

Expand Down Expand Up @@ -1504,69 +1503,5 @@ def __init__(self, value):
self.assertEqual(getattr(f, 'foo', 'none'), 'bar')


# Test PyFloat_Pack2(), PyFloat_Pack4() and PyFloat_Pack8()
# Test PyFloat_Unpack2(), PyFloat_Unpack4() and PyFloat_Unpack8()
BIG_ENDIAN = 0
LITTLE_ENDIAN = 1
EPSILON = {
2: 2.0 ** -11, # binary16
4: 2.0 ** -24, # binary32
8: 2.0 ** -53, # binary64
}

@unittest.skipIf(_testcapi is None, 'needs _testcapi')
class PackTests(unittest.TestCase):
def test_pack(self):
self.assertEqual(_testcapi.float_pack(2, 1.5, BIG_ENDIAN),
b'>\x00')
self.assertEqual(_testcapi.float_pack(4, 1.5, BIG_ENDIAN),
b'?\xc0\x00\x00')
self.assertEqual(_testcapi.float_pack(8, 1.5, BIG_ENDIAN),
b'?\xf8\x00\x00\x00\x00\x00\x00')
self.assertEqual(_testcapi.float_pack(2, 1.5, LITTLE_ENDIAN),
b'\x00>')
self.assertEqual(_testcapi.float_pack(4, 1.5, LITTLE_ENDIAN),
b'\x00\x00\xc0?')
self.assertEqual(_testcapi.float_pack(8, 1.5, LITTLE_ENDIAN),
b'\x00\x00\x00\x00\x00\x00\xf8?')

def test_unpack(self):
self.assertEqual(_testcapi.float_unpack(b'>\x00', BIG_ENDIAN),
1.5)
self.assertEqual(_testcapi.float_unpack(b'?\xc0\x00\x00', BIG_ENDIAN),
1.5)
self.assertEqual(_testcapi.float_unpack(b'?\xf8\x00\x00\x00\x00\x00\x00', BIG_ENDIAN),
1.5)
self.assertEqual(_testcapi.float_unpack(b'\x00>', LITTLE_ENDIAN),
1.5)
self.assertEqual(_testcapi.float_unpack(b'\x00\x00\xc0?', LITTLE_ENDIAN),
1.5)
self.assertEqual(_testcapi.float_unpack(b'\x00\x00\x00\x00\x00\x00\xf8?', LITTLE_ENDIAN),
1.5)

def test_roundtrip(self):
large = 2.0 ** 100
values = [1.0, 1.5, large, 1.0/7, math.pi]
if HAVE_IEEE_754:
values.extend((INF, NAN))
for value in values:
for size in (2, 4, 8,):
if size == 2 and value == large:
# too large for 16-bit float
continue
rel_tol = EPSILON[size]
for endian in (BIG_ENDIAN, LITTLE_ENDIAN):
with self.subTest(value=value, size=size, endian=endian):
data = _testcapi.float_pack(size, value, endian)
value2 = _testcapi.float_unpack(data, endian)
if isnan(value):
self.assertTrue(isnan(value2), (value, value2))
elif size < 8:
self.assertTrue(math.isclose(value2, value, rel_tol=rel_tol),
(value, value2))
else:
self.assertEqual(value2, value)


if __name__ == '__main__':
unittest.main()