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Add assertRaises context manager to testutils #526

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Merged
merged 1 commit into from
Feb 23, 2019
Merged

Add assertRaises context manager to testutils #526

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26 changes: 5 additions & 21 deletions tests/snippets/set.py
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
from testutils import assert_raises
from testutils import assert_raises, assertRaises

assert set([1,2]) == set([1,2])
assert not set([1,2,3]) == set([1,2])
Expand Down Expand Up @@ -109,12 +109,8 @@ def __hash__(self):
a = set([1,2,3])
a |= set([3,4,5])
assert a == set([1,2,3,4,5])
try:
with assertRaises(TypeError):
a |= 1
except TypeError:
pass
else:
assert False, "TypeError not raised"

a = set([1,2,3])
a.intersection_update([2,3,4,5])
Expand All @@ -124,12 +120,8 @@ def __hash__(self):
a = set([1,2,3])
a &= set([2,3,4,5])
assert a == set([2,3])
try:
with assertRaises(TypeError):
a &= 1
except TypeError:
pass
else:
assert False, "TypeError not raised"

a = set([1,2,3])
a.difference_update([3,4,5])
Expand All @@ -139,12 +131,8 @@ def __hash__(self):
a = set([1,2,3])
a -= set([3,4,5])
assert a == set([1,2])
try:
with assertRaises(TypeError):
a -= 1
except TypeError:
pass
else:
assert False, "TypeError not raised"

a = set([1,2,3])
a.symmetric_difference_update([3,4,5])
Expand All @@ -154,9 +142,5 @@ def __hash__(self):
a = set([1,2,3])
a ^= set([3,4,5])
assert a == set([1,2,4,5])
try:
with assertRaises(TypeError):
a ^= 1
except TypeError:
pass
else:
assert False, "TypeError not raised"
16 changes: 16 additions & 0 deletions tests/snippets/testutils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -18,3 +18,19 @@ def assert_raises(exc_type, expr, msg=None):
if msg is not None:
failmsg += ': {!s}'.format(msg)
assert False, failmsg


class assertRaises:
def __init__(self, expected):
self.expected = expected

def __enter__(self):
return self

def __exit__(self, exc_type, exc_val, exc_tb):
if exc_type is None:
failmsg = '{!s} was not raised'.format(self.expected.__name_)
assert False, failmsg
if not issubclass(exc_type, self.expected):
return False
return True