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tests.py
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tests.py
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import sys
import unittest
from contextlib import closing, suppress, ExitStack
class ClosingTestCase(unittest.TestCase):
class Closable:
def __init__(self):
self.closed = False
def close(self):
self.closed = True
def test_closing(self):
closable = self.Closable()
with closing(closable) as c:
self.assertFalse(c.closed)
self.assertTrue(closable.closed)
def test_closing_after_error(self):
closable = self.Closable()
exc = Exception()
try:
with closing(closable) as c:
raise exc
except Exception as e:
self.assertEqual(exc, e)
self.assertTrue(closable.closed)
class SuppressTestCase(unittest.TestCase):
def test_suppress(self):
with suppress(ValueError, TypeError):
raise ValueError()
raise TypeError()
self.assertTrue(True)
class TestExitStack(unittest.TestCase):
# @support.requires_docstrings
def _test_instance_docs(self):
# Issue 19330: ensure context manager instances have good docstrings
cm_docstring = ExitStack.__doc__
obj = ExitStack()
self.assertEqual(obj.__doc__, cm_docstring)
def test_no_resources(self):
with ExitStack():
pass
def test_callback(self):
expected = [
((), {}),
((1,), {}),
((1,2), {}),
((), dict(example=1)),
((1,), dict(example=1)),
((1,2), dict(example=1)),
]
result = []
def _exit(*args, **kwds):
"""Test metadata propagation"""
result.append((args, kwds))
with ExitStack() as stack:
for args, kwds in reversed(expected):
if args and kwds:
f = stack.callback(_exit, *args, **kwds)
elif args:
f = stack.callback(_exit, *args)
elif kwds:
f = stack.callback(_exit, **kwds)
else:
f = stack.callback(_exit)
self.assertIs(f, _exit)
# for wrapper in stack._exit_callbacks:
# self.assertIs(wrapper.__wrapped__, _exit)
# self.assertNotEqual(wrapper.__name__, _exit.__name__)
# self.assertIsNone(wrapper.__doc__, _exit.__doc__)
self.assertEqual(result, expected)
def test_push(self):
exc_raised = ZeroDivisionError
def _expect_exc(exc_type, exc, exc_tb):
self.assertIs(exc_type, exc_raised)
def _suppress_exc(*exc_details):
return True
def _expect_ok(exc_type, exc, exc_tb):
self.assertIsNone(exc_type)
self.assertIsNone(exc)
self.assertIsNone(exc_tb)
class ExitCM(object):
def __init__(self, check_exc):
self.check_exc = check_exc
def __enter__(self):
self.fail("Should not be called!")
def __exit__(self, *exc_details):
self.check_exc(*exc_details)
with ExitStack() as stack:
stack.push(_expect_ok)
self.assertIs(tuple(stack._exit_callbacks)[-1], _expect_ok)
cm = ExitCM(_expect_ok)
stack.push(cm)
# self.assertIs(stack._exit_callbacks[-1].__self__, cm)
stack.push(_suppress_exc)
self.assertIs(tuple(stack._exit_callbacks)[-1], _suppress_exc)
cm = ExitCM(_expect_exc)
stack.push(cm)
# self.assertIs(stack._exit_callbacks[-1].__self__, cm)
stack.push(_expect_exc)
self.assertIs(tuple(stack._exit_callbacks)[-1], _expect_exc)
stack.push(_expect_exc)
self.assertIs(tuple(stack._exit_callbacks)[-1], _expect_exc)
1/0
def test_enter_context(self):
class TestCM(object):
def __enter__(self):
result.append(1)
def __exit__(self, *exc_details):
result.append(3)
result = []
cm = TestCM()
with ExitStack() as stack:
@stack.callback # Registered first => cleaned up last
def _exit():
result.append(4)
self.assertIsNotNone(_exit)
stack.enter_context(cm)
# self.assertIs(stack._exit_callbacks[-1].__self__, cm)
result.append(2)
self.assertEqual(result, [1, 2, 3, 4])
def test_close(self):
result = []
with ExitStack() as stack:
@stack.callback
def _exit():
result.append(1)
self.assertIsNotNone(_exit)
stack.close()
result.append(2)
self.assertEqual(result, [1, 2])
def test_pop_all(self):
result = []
with ExitStack() as stack:
@stack.callback
def _exit():
result.append(3)
self.assertIsNotNone(_exit)
new_stack = stack.pop_all()
result.append(1)
result.append(2)
new_stack.close()
self.assertEqual(result, [1, 2, 3])
def test_exit_raise(self):
with self.assertRaises(ZeroDivisionError):
with ExitStack() as stack:
stack.push(lambda *exc: False)
1/0
def test_exit_suppress(self):
with ExitStack() as stack:
stack.push(lambda *exc: True)
1/0
def test_exit_exception_chaining_reference(self):
# Sanity check to make sure that ExitStack chaining matches
# actual nested with statements
exc_chain = []
class RaiseExc:
def __init__(self, exc):
self.exc = exc
def __enter__(self):
return self
def __exit__(self, *exc_details):
exc_chain.append(exc_details[0])
raise self.exc
class RaiseExcWithContext:
def __init__(self, outer, inner):
self.outer = outer
self.inner = inner
def __enter__(self):
return self
def __exit__(self, *exc_details):
try:
exc_chain.append(exc_details[0])
raise self.inner
except:
exc_chain.append(sys.exc_info()[0])
raise self.outer
class SuppressExc:
def __enter__(self):
return self
def __exit__(self, *exc_details):
type(self).saved_details = exc_details
return True
try:
with RaiseExc(IndexError):
with RaiseExcWithContext(KeyError, AttributeError):
with SuppressExc():
with RaiseExc(ValueError):
1 / 0
except IndexError as exc:
# self.assertIsInstance(exc.__context__, KeyError)
# self.assertIsInstance(exc.__context__.__context__, AttributeError)
# Inner exceptions were suppressed
# self.assertIsNone(exc.__context__.__context__.__context__)
exc_chain.append(type(exc))
assert tuple(exc_chain) == (ZeroDivisionError, None, AttributeError, KeyError, IndexError)
else:
self.fail("Expected IndexError, but no exception was raised")
# Check the inner exceptions
inner_exc = SuppressExc.saved_details[1]
self.assertIsInstance(inner_exc, ValueError)
# self.assertIsInstance(inner_exc.__context__, ZeroDivisionError)
def test_exit_exception_chaining(self):
# Ensure exception chaining matches the reference behaviour
exc_chain = []
def raise_exc(exc):
frame_exc = sys.exc_info()[0]
if frame_exc is not None:
exc_chain.append(frame_exc)
exc_chain.append(exc)
raise exc
saved_details = None
def suppress_exc(*exc_details):
nonlocal saved_details
saved_details = exc_details
assert exc_chain[-1] == exc_details[0]
exc_chain[-1] = None
return True
try:
with ExitStack() as stack:
stack.callback(raise_exc, IndexError)
stack.callback(raise_exc, KeyError)
stack.callback(raise_exc, AttributeError)
stack.push(suppress_exc)
stack.callback(raise_exc, ValueError)
1 / 0
except IndexError as exc:
# self.assertIsInstance(exc.__context__, KeyError)
# self.assertIsInstance(exc.__context__.__context__, AttributeError)
# Inner exceptions were suppressed
# self.assertIsNone(exc.__context__.__context__.__context__)
assert tuple(exc_chain) == (ZeroDivisionError, None, AttributeError, KeyError, IndexError)
else:
self.fail("Expected IndexError, but no exception was raised")
# Check the inner exceptions
inner_exc = saved_details[1]
self.assertIsInstance(inner_exc, ValueError)
# self.assertIsInstance(inner_exc.__context__, ZeroDivisionError)
def test_exit_exception_non_suppressing(self):
# http://bugs.python.org/issue19092
def raise_exc(exc):
raise exc
def suppress_exc(*exc_details):
return True
try:
with ExitStack() as stack:
stack.callback(lambda: None)
stack.callback(raise_exc, IndexError)
except Exception as exc:
self.assertIsInstance(exc, IndexError)
else:
self.fail("Expected IndexError, but no exception was raised")
try:
with ExitStack() as stack:
stack.callback(raise_exc, KeyError)
stack.push(suppress_exc)
stack.callback(raise_exc, IndexError)
except Exception as exc:
self.assertIsInstance(exc, KeyError)
else:
self.fail("Expected KeyError, but no exception was raised")
def _test_exit_exception_with_correct_context(self):
# http://bugs.python.org/issue20317
@contextmanager
def gets_the_context_right(exc):
try:
yield
finally:
raise exc
exc1 = Exception(1)
exc2 = Exception(2)
exc3 = Exception(3)
exc4 = Exception(4)
# The contextmanager already fixes the context, so prior to the
# fix, ExitStack would try to fix it *again* and get into an
# infinite self-referential loop
try:
with ExitStack() as stack:
stack.enter_context(gets_the_context_right(exc4))
stack.enter_context(gets_the_context_right(exc3))
stack.enter_context(gets_the_context_right(exc2))
raise exc1
except Exception as exc:
self.assertIs(exc, exc4)
self.assertIs(exc.__context__, exc3)
self.assertIs(exc.__context__.__context__, exc2)
self.assertIs(exc.__context__.__context__.__context__, exc1)
self.assertIsNone(
exc.__context__.__context__.__context__.__context__)
def _test_exit_exception_with_existing_context(self):
# Addresses a lack of test coverage discovered after checking in a
# fix for issue 20317 that still contained debugging code.
def raise_nested(inner_exc, outer_exc):
try:
raise inner_exc
finally:
raise outer_exc
exc1 = Exception(1)
exc2 = Exception(2)
exc3 = Exception(3)
exc4 = Exception(4)
exc5 = Exception(5)
try:
with ExitStack() as stack:
stack.callback(raise_nested, exc4, exc5)
stack.callback(raise_nested, exc2, exc3)
raise exc1
except Exception as exc:
self.assertIs(exc, exc5)
self.assertIs(exc.__context__, exc4)
self.assertIs(exc.__context__.__context__, exc3)
self.assertIs(exc.__context__.__context__.__context__, exc2)
self.assertIs(
exc.__context__.__context__.__context__.__context__, exc1)
self.assertIsNone(
exc.__context__.__context__.__context__.__context__.__context__)
def test_body_exception_suppress(self):
def suppress_exc(*exc_details):
return True
try:
with ExitStack() as stack:
stack.push(suppress_exc)
1/0
except IndexError as exc:
self.fail("Expected no exception, got IndexError")
def test_exit_exception_chaining_suppress(self):
with ExitStack() as stack:
stack.push(lambda *exc: True)
stack.push(lambda *exc: 1/0)
stack.push(lambda *exc: {}[1])
def test_excessive_nesting(self):
# The original implementation would die with RecursionError here
with ExitStack() as stack:
for i in range(10000):
stack.callback(int)
def test_instance_bypass(self):
class Example(object): pass
cm = Example()
cm.__exit__ = object()
stack = ExitStack()
self.assertRaises(AttributeError, stack.enter_context, cm)
stack.push(cm)
self.assertIs(tuple(stack._exit_callbacks)[-1], cm)
if __name__ == '__main__':
unittest.main()