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Issue #24635: Fixed flakiness in test_typing.py.

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This commit is contained in:
Guido van Rossum 2015-09-04 12:00:06 -07:00
parent 874dbe895d
commit 647bae6c52
3 changed files with 27 additions and 8 deletions
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17
Lib/test/test_typing.py
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@ -436,12 +436,14 @@ def test_cannot_instantiate(self):
c()
def test_callable_instance_works(self):
f = lambda: None
def f():
pass
assert isinstance(f, Callable)
assert not isinstance(None, Callable)
def test_callable_instance_type_error(self):
f = lambda: None
def f():
pass
with self.assertRaises(TypeError):
assert isinstance(f, Callable[[], None])
with self.assertRaises(TypeError):
@ -674,7 +676,9 @@ def test_type_erasure(self):
T = TypeVar('T')
class Node(Generic[T]):
def __init__(self, label: T, left: 'Node[T]' = None, right: 'Node[T]' = None):
def __init__(self, label: T,
left: 'Node[T]' = None,
right: 'Node[T]' = None):
self.label = label # type: T
self.left = left # type: Optional[Node[T]]
self.right = right # type: Optional[Node[T]]
@ -933,9 +937,16 @@ def test_hashable(self):
assert not isinstance([], typing.Hashable)
def test_iterable(self):
assert isinstance([], typing.Iterable)
# Due to ABC caching, the second time takes a separate code
# path and could fail. So call this a few times.
assert isinstance([], typing.Iterable)
assert isinstance([], typing.Iterable)
assert isinstance([], typing.Iterable[int])
assert not isinstance(42, typing.Iterable)
# Just in case, also test issubclass() a few times.
assert issubclass(list, typing.Iterable)
assert issubclass(list, typing.Iterable)
def test_iterator(self):
it = iter([])