752 lines
26 KiB
Python
752 lines
26 KiB
Python
#!/usr/bin/env python
|
|
|
|
"""Unit tests for the with statement specified in PEP 343."""
|
|
|
|
|
|
__author__ = "Mike Bland"
|
|
__email__ = "mbland at acm dot org"
|
|
|
|
import sys
|
|
import unittest
|
|
from collections import deque
|
|
from contextlib import GeneratorContextManager, contextmanager
|
|
from test.test_support import run_unittest
|
|
|
|
|
|
class MockContextManager(GeneratorContextManager):
|
|
def __init__(self, gen):
|
|
GeneratorContextManager.__init__(self, gen)
|
|
self.enter_called = False
|
|
self.exit_called = False
|
|
self.exit_args = None
|
|
|
|
def __enter__(self):
|
|
self.enter_called = True
|
|
return GeneratorContextManager.__enter__(self)
|
|
|
|
def __exit__(self, type, value, traceback):
|
|
self.exit_called = True
|
|
self.exit_args = (type, value, traceback)
|
|
return GeneratorContextManager.__exit__(self, type,
|
|
value, traceback)
|
|
|
|
|
|
def mock_contextmanager(func):
|
|
def helper(*args, **kwds):
|
|
return MockContextManager(func(*args, **kwds))
|
|
return helper
|
|
|
|
|
|
class MockResource(object):
|
|
def __init__(self):
|
|
self.yielded = False
|
|
self.stopped = False
|
|
|
|
|
|
@mock_contextmanager
|
|
def mock_contextmanager_generator():
|
|
mock = MockResource()
|
|
try:
|
|
mock.yielded = True
|
|
yield mock
|
|
finally:
|
|
mock.stopped = True
|
|
|
|
|
|
class Nested(object):
|
|
|
|
def __init__(self, *managers):
|
|
self.managers = managers
|
|
self.entered = None
|
|
|
|
def __enter__(self):
|
|
if self.entered is not None:
|
|
raise RuntimeError("Context is not reentrant")
|
|
self.entered = deque()
|
|
vars = []
|
|
try:
|
|
for mgr in self.managers:
|
|
vars.append(mgr.__enter__())
|
|
self.entered.appendleft(mgr)
|
|
except:
|
|
if not self.__exit__(*sys.exc_info()):
|
|
raise
|
|
return vars
|
|
|
|
def __exit__(self, *exc_info):
|
|
# Behave like nested with statements
|
|
# first in, last out
|
|
# New exceptions override old ones
|
|
ex = exc_info
|
|
for mgr in self.entered:
|
|
try:
|
|
if mgr.__exit__(*ex):
|
|
ex = (None, None, None)
|
|
except:
|
|
ex = sys.exc_info()
|
|
self.entered = None
|
|
if ex is not exc_info:
|
|
raise ex[0], ex[1], ex[2]
|
|
|
|
|
|
class MockNested(Nested):
|
|
def __init__(self, *managers):
|
|
Nested.__init__(self, *managers)
|
|
self.enter_called = False
|
|
self.exit_called = False
|
|
self.exit_args = None
|
|
|
|
def __enter__(self):
|
|
self.enter_called = True
|
|
return Nested.__enter__(self)
|
|
|
|
def __exit__(self, *exc_info):
|
|
self.exit_called = True
|
|
self.exit_args = exc_info
|
|
return Nested.__exit__(self, *exc_info)
|
|
|
|
|
|
class FailureTestCase(unittest.TestCase):
|
|
def testNameError(self):
|
|
def fooNotDeclared():
|
|
with foo: pass
|
|
self.assertRaises(NameError, fooNotDeclared)
|
|
|
|
def testEnterAttributeError(self):
|
|
class LacksEnter(object):
|
|
def __exit__(self, type, value, traceback):
|
|
pass
|
|
|
|
def fooLacksEnter():
|
|
foo = LacksEnter()
|
|
with foo: pass
|
|
self.assertRaises(AttributeError, fooLacksEnter)
|
|
|
|
def testExitAttributeError(self):
|
|
class LacksExit(object):
|
|
def __enter__(self):
|
|
pass
|
|
|
|
def fooLacksExit():
|
|
foo = LacksExit()
|
|
with foo: pass
|
|
self.assertRaises(AttributeError, fooLacksExit)
|
|
|
|
def assertRaisesSyntaxError(self, codestr):
|
|
def shouldRaiseSyntaxError(s):
|
|
compile(s, '', 'single')
|
|
self.assertRaises(SyntaxError, shouldRaiseSyntaxError, codestr)
|
|
|
|
def testAssignmentToNoneError(self):
|
|
self.assertRaisesSyntaxError('with mock as None:\n pass')
|
|
self.assertRaisesSyntaxError(
|
|
'with mock as (None):\n'
|
|
' pass')
|
|
|
|
def testAssignmentToEmptyTupleError(self):
|
|
self.assertRaisesSyntaxError(
|
|
'with mock as ():\n'
|
|
' pass')
|
|
|
|
def testAssignmentToTupleOnlyContainingNoneError(self):
|
|
self.assertRaisesSyntaxError('with mock as None,:\n pass')
|
|
self.assertRaisesSyntaxError(
|
|
'with mock as (None,):\n'
|
|
' pass')
|
|
|
|
def testAssignmentToTupleContainingNoneError(self):
|
|
self.assertRaisesSyntaxError(
|
|
'with mock as (foo, None, bar):\n'
|
|
' pass')
|
|
|
|
def testEnterThrows(self):
|
|
class EnterThrows(object):
|
|
def __enter__(self):
|
|
raise RuntimeError("Enter threw")
|
|
def __exit__(self, *args):
|
|
pass
|
|
|
|
def shouldThrow():
|
|
ct = EnterThrows()
|
|
self.foo = None
|
|
with ct as self.foo:
|
|
pass
|
|
self.assertRaises(RuntimeError, shouldThrow)
|
|
self.assertEqual(self.foo, None)
|
|
|
|
def testExitThrows(self):
|
|
class ExitThrows(object):
|
|
def __enter__(self):
|
|
return
|
|
def __exit__(self, *args):
|
|
raise RuntimeError(42)
|
|
def shouldThrow():
|
|
with ExitThrows():
|
|
pass
|
|
self.assertRaises(RuntimeError, shouldThrow)
|
|
|
|
class ContextmanagerAssertionMixin(object):
|
|
TEST_EXCEPTION = RuntimeError("test exception")
|
|
|
|
def assertInWithManagerInvariants(self, mock_manager):
|
|
self.assertTrue(mock_manager.enter_called)
|
|
self.assertFalse(mock_manager.exit_called)
|
|
self.assertEqual(mock_manager.exit_args, None)
|
|
|
|
def assertAfterWithManagerInvariants(self, mock_manager, exit_args):
|
|
self.assertTrue(mock_manager.enter_called)
|
|
self.assertTrue(mock_manager.exit_called)
|
|
self.assertEqual(mock_manager.exit_args, exit_args)
|
|
|
|
def assertAfterWithManagerInvariantsNoError(self, mock_manager):
|
|
self.assertAfterWithManagerInvariants(mock_manager,
|
|
(None, None, None))
|
|
|
|
def assertInWithGeneratorInvariants(self, mock_generator):
|
|
self.assertTrue(mock_generator.yielded)
|
|
self.assertFalse(mock_generator.stopped)
|
|
|
|
def assertAfterWithGeneratorInvariantsNoError(self, mock_generator):
|
|
self.assertTrue(mock_generator.yielded)
|
|
self.assertTrue(mock_generator.stopped)
|
|
|
|
def raiseTestException(self):
|
|
raise self.TEST_EXCEPTION
|
|
|
|
def assertAfterWithManagerInvariantsWithError(self, mock_manager,
|
|
exc_type=None):
|
|
self.assertTrue(mock_manager.enter_called)
|
|
self.assertTrue(mock_manager.exit_called)
|
|
if exc_type is None:
|
|
self.assertEqual(mock_manager.exit_args[1], self.TEST_EXCEPTION)
|
|
exc_type = type(self.TEST_EXCEPTION)
|
|
self.assertEqual(mock_manager.exit_args[0], exc_type)
|
|
# Test the __exit__ arguments. Issue #7853
|
|
self.assertIsInstance(mock_manager.exit_args[1], exc_type)
|
|
self.assertIsNot(mock_manager.exit_args[2], None)
|
|
|
|
def assertAfterWithGeneratorInvariantsWithError(self, mock_generator):
|
|
self.assertTrue(mock_generator.yielded)
|
|
self.assertTrue(mock_generator.stopped)
|
|
|
|
|
|
class NonexceptionalTestCase(unittest.TestCase, ContextmanagerAssertionMixin):
|
|
def testInlineGeneratorSyntax(self):
|
|
with mock_contextmanager_generator():
|
|
pass
|
|
|
|
def testUnboundGenerator(self):
|
|
mock = mock_contextmanager_generator()
|
|
with mock:
|
|
pass
|
|
self.assertAfterWithManagerInvariantsNoError(mock)
|
|
|
|
def testInlineGeneratorBoundSyntax(self):
|
|
with mock_contextmanager_generator() as foo:
|
|
self.assertInWithGeneratorInvariants(foo)
|
|
# FIXME: In the future, we'll try to keep the bound names from leaking
|
|
self.assertAfterWithGeneratorInvariantsNoError(foo)
|
|
|
|
def testInlineGeneratorBoundToExistingVariable(self):
|
|
foo = None
|
|
with mock_contextmanager_generator() as foo:
|
|
self.assertInWithGeneratorInvariants(foo)
|
|
self.assertAfterWithGeneratorInvariantsNoError(foo)
|
|
|
|
def testInlineGeneratorBoundToDottedVariable(self):
|
|
with mock_contextmanager_generator() as self.foo:
|
|
self.assertInWithGeneratorInvariants(self.foo)
|
|
self.assertAfterWithGeneratorInvariantsNoError(self.foo)
|
|
|
|
def testBoundGenerator(self):
|
|
mock = mock_contextmanager_generator()
|
|
with mock as foo:
|
|
self.assertInWithGeneratorInvariants(foo)
|
|
self.assertInWithManagerInvariants(mock)
|
|
self.assertAfterWithGeneratorInvariantsNoError(foo)
|
|
self.assertAfterWithManagerInvariantsNoError(mock)
|
|
|
|
def testNestedSingleStatements(self):
|
|
mock_a = mock_contextmanager_generator()
|
|
with mock_a as foo:
|
|
mock_b = mock_contextmanager_generator()
|
|
with mock_b as bar:
|
|
self.assertInWithManagerInvariants(mock_a)
|
|
self.assertInWithManagerInvariants(mock_b)
|
|
self.assertInWithGeneratorInvariants(foo)
|
|
self.assertInWithGeneratorInvariants(bar)
|
|
self.assertAfterWithManagerInvariantsNoError(mock_b)
|
|
self.assertAfterWithGeneratorInvariantsNoError(bar)
|
|
self.assertInWithManagerInvariants(mock_a)
|
|
self.assertInWithGeneratorInvariants(foo)
|
|
self.assertAfterWithManagerInvariantsNoError(mock_a)
|
|
self.assertAfterWithGeneratorInvariantsNoError(foo)
|
|
|
|
|
|
class NestedNonexceptionalTestCase(unittest.TestCase,
|
|
ContextmanagerAssertionMixin):
|
|
def testSingleArgInlineGeneratorSyntax(self):
|
|
with Nested(mock_contextmanager_generator()):
|
|
pass
|
|
|
|
def testSingleArgBoundToNonTuple(self):
|
|
m = mock_contextmanager_generator()
|
|
# This will bind all the arguments to nested() into a single list
|
|
# assigned to foo.
|
|
with Nested(m) as foo:
|
|
self.assertInWithManagerInvariants(m)
|
|
self.assertAfterWithManagerInvariantsNoError(m)
|
|
|
|
def testSingleArgBoundToSingleElementParenthesizedList(self):
|
|
m = mock_contextmanager_generator()
|
|
# This will bind all the arguments to nested() into a single list
|
|
# assigned to foo.
|
|
with Nested(m) as (foo):
|
|
self.assertInWithManagerInvariants(m)
|
|
self.assertAfterWithManagerInvariantsNoError(m)
|
|
|
|
def testSingleArgBoundToMultipleElementTupleError(self):
|
|
def shouldThrowValueError():
|
|
with Nested(mock_contextmanager_generator()) as (foo, bar):
|
|
pass
|
|
self.assertRaises(ValueError, shouldThrowValueError)
|
|
|
|
def testSingleArgUnbound(self):
|
|
mock_contextmanager = mock_contextmanager_generator()
|
|
mock_nested = MockNested(mock_contextmanager)
|
|
with mock_nested:
|
|
self.assertInWithManagerInvariants(mock_contextmanager)
|
|
self.assertInWithManagerInvariants(mock_nested)
|
|
self.assertAfterWithManagerInvariantsNoError(mock_contextmanager)
|
|
self.assertAfterWithManagerInvariantsNoError(mock_nested)
|
|
|
|
def testMultipleArgUnbound(self):
|
|
m = mock_contextmanager_generator()
|
|
n = mock_contextmanager_generator()
|
|
o = mock_contextmanager_generator()
|
|
mock_nested = MockNested(m, n, o)
|
|
with mock_nested:
|
|
self.assertInWithManagerInvariants(m)
|
|
self.assertInWithManagerInvariants(n)
|
|
self.assertInWithManagerInvariants(o)
|
|
self.assertInWithManagerInvariants(mock_nested)
|
|
self.assertAfterWithManagerInvariantsNoError(m)
|
|
self.assertAfterWithManagerInvariantsNoError(n)
|
|
self.assertAfterWithManagerInvariantsNoError(o)
|
|
self.assertAfterWithManagerInvariantsNoError(mock_nested)
|
|
|
|
def testMultipleArgBound(self):
|
|
mock_nested = MockNested(mock_contextmanager_generator(),
|
|
mock_contextmanager_generator(), mock_contextmanager_generator())
|
|
with mock_nested as (m, n, o):
|
|
self.assertInWithGeneratorInvariants(m)
|
|
self.assertInWithGeneratorInvariants(n)
|
|
self.assertInWithGeneratorInvariants(o)
|
|
self.assertInWithManagerInvariants(mock_nested)
|
|
self.assertAfterWithGeneratorInvariantsNoError(m)
|
|
self.assertAfterWithGeneratorInvariantsNoError(n)
|
|
self.assertAfterWithGeneratorInvariantsNoError(o)
|
|
self.assertAfterWithManagerInvariantsNoError(mock_nested)
|
|
|
|
|
|
class ExceptionalTestCase(unittest.TestCase, ContextmanagerAssertionMixin):
|
|
def testSingleResource(self):
|
|
cm = mock_contextmanager_generator()
|
|
def shouldThrow():
|
|
with cm as self.resource:
|
|
self.assertInWithManagerInvariants(cm)
|
|
self.assertInWithGeneratorInvariants(self.resource)
|
|
self.raiseTestException()
|
|
self.assertRaises(RuntimeError, shouldThrow)
|
|
self.assertAfterWithManagerInvariantsWithError(cm)
|
|
self.assertAfterWithGeneratorInvariantsWithError(self.resource)
|
|
|
|
@unittest.expectedFailure
|
|
def testExceptionNormalized(self):
|
|
cm = mock_contextmanager_generator()
|
|
def shouldThrow():
|
|
with cm as self.resource:
|
|
# Note this relies on the fact that 1 // 0 produces an exception
|
|
# that is not normalized immediately.
|
|
1 // 0
|
|
self.assertRaises(ZeroDivisionError, shouldThrow)
|
|
self.assertAfterWithManagerInvariantsWithError(cm, ZeroDivisionError)
|
|
|
|
def testNestedSingleStatements(self):
|
|
mock_a = mock_contextmanager_generator()
|
|
mock_b = mock_contextmanager_generator()
|
|
def shouldThrow():
|
|
with mock_a as self.foo:
|
|
with mock_b as self.bar:
|
|
self.assertInWithManagerInvariants(mock_a)
|
|
self.assertInWithManagerInvariants(mock_b)
|
|
self.assertInWithGeneratorInvariants(self.foo)
|
|
self.assertInWithGeneratorInvariants(self.bar)
|
|
self.raiseTestException()
|
|
self.assertRaises(RuntimeError, shouldThrow)
|
|
self.assertAfterWithManagerInvariantsWithError(mock_a)
|
|
self.assertAfterWithManagerInvariantsWithError(mock_b)
|
|
self.assertAfterWithGeneratorInvariantsWithError(self.foo)
|
|
self.assertAfterWithGeneratorInvariantsWithError(self.bar)
|
|
|
|
def testMultipleResourcesInSingleStatement(self):
|
|
cm_a = mock_contextmanager_generator()
|
|
cm_b = mock_contextmanager_generator()
|
|
mock_nested = MockNested(cm_a, cm_b)
|
|
def shouldThrow():
|
|
with mock_nested as (self.resource_a, self.resource_b):
|
|
self.assertInWithManagerInvariants(cm_a)
|
|
self.assertInWithManagerInvariants(cm_b)
|
|
self.assertInWithManagerInvariants(mock_nested)
|
|
self.assertInWithGeneratorInvariants(self.resource_a)
|
|
self.assertInWithGeneratorInvariants(self.resource_b)
|
|
self.raiseTestException()
|
|
self.assertRaises(RuntimeError, shouldThrow)
|
|
self.assertAfterWithManagerInvariantsWithError(cm_a)
|
|
self.assertAfterWithManagerInvariantsWithError(cm_b)
|
|
self.assertAfterWithManagerInvariantsWithError(mock_nested)
|
|
self.assertAfterWithGeneratorInvariantsWithError(self.resource_a)
|
|
self.assertAfterWithGeneratorInvariantsWithError(self.resource_b)
|
|
|
|
def testNestedExceptionBeforeInnerStatement(self):
|
|
mock_a = mock_contextmanager_generator()
|
|
mock_b = mock_contextmanager_generator()
|
|
self.bar = None
|
|
def shouldThrow():
|
|
with mock_a as self.foo:
|
|
self.assertInWithManagerInvariants(mock_a)
|
|
self.assertInWithGeneratorInvariants(self.foo)
|
|
self.raiseTestException()
|
|
with mock_b as self.bar:
|
|
pass
|
|
self.assertRaises(RuntimeError, shouldThrow)
|
|
self.assertAfterWithManagerInvariantsWithError(mock_a)
|
|
self.assertAfterWithGeneratorInvariantsWithError(self.foo)
|
|
|
|
# The inner statement stuff should never have been touched
|
|
self.assertEqual(self.bar, None)
|
|
self.assertFalse(mock_b.enter_called)
|
|
self.assertFalse(mock_b.exit_called)
|
|
self.assertEqual(mock_b.exit_args, None)
|
|
|
|
def testNestedExceptionAfterInnerStatement(self):
|
|
mock_a = mock_contextmanager_generator()
|
|
mock_b = mock_contextmanager_generator()
|
|
def shouldThrow():
|
|
with mock_a as self.foo:
|
|
with mock_b as self.bar:
|
|
self.assertInWithManagerInvariants(mock_a)
|
|
self.assertInWithManagerInvariants(mock_b)
|
|
self.assertInWithGeneratorInvariants(self.foo)
|
|
self.assertInWithGeneratorInvariants(self.bar)
|
|
self.raiseTestException()
|
|
self.assertRaises(RuntimeError, shouldThrow)
|
|
self.assertAfterWithManagerInvariantsWithError(mock_a)
|
|
self.assertAfterWithManagerInvariantsNoError(mock_b)
|
|
self.assertAfterWithGeneratorInvariantsWithError(self.foo)
|
|
self.assertAfterWithGeneratorInvariantsNoError(self.bar)
|
|
|
|
def testRaisedStopIteration1(self):
|
|
# From bug 1462485
|
|
@contextmanager
|
|
def cm():
|
|
yield
|
|
|
|
def shouldThrow():
|
|
with cm():
|
|
raise StopIteration("from with")
|
|
|
|
self.assertRaises(StopIteration, shouldThrow)
|
|
|
|
def testRaisedStopIteration2(self):
|
|
# From bug 1462485
|
|
class cm(object):
|
|
def __enter__(self):
|
|
pass
|
|
def __exit__(self, type, value, traceback):
|
|
pass
|
|
|
|
def shouldThrow():
|
|
with cm():
|
|
raise StopIteration("from with")
|
|
|
|
self.assertRaises(StopIteration, shouldThrow)
|
|
|
|
def testRaisedStopIteration3(self):
|
|
# Another variant where the exception hasn't been instantiated
|
|
# From bug 1705170
|
|
@contextmanager
|
|
def cm():
|
|
yield
|
|
|
|
def shouldThrow():
|
|
with cm():
|
|
raise iter([]).next()
|
|
|
|
self.assertRaises(StopIteration, shouldThrow)
|
|
|
|
def testRaisedGeneratorExit1(self):
|
|
# From bug 1462485
|
|
@contextmanager
|
|
def cm():
|
|
yield
|
|
|
|
def shouldThrow():
|
|
with cm():
|
|
raise GeneratorExit("from with")
|
|
|
|
self.assertRaises(GeneratorExit, shouldThrow)
|
|
|
|
def testRaisedGeneratorExit2(self):
|
|
# From bug 1462485
|
|
class cm (object):
|
|
def __enter__(self):
|
|
pass
|
|
def __exit__(self, type, value, traceback):
|
|
pass
|
|
|
|
def shouldThrow():
|
|
with cm():
|
|
raise GeneratorExit("from with")
|
|
|
|
self.assertRaises(GeneratorExit, shouldThrow)
|
|
|
|
def testErrorsInBool(self):
|
|
# issue4589: __exit__ return code may raise an exception
|
|
# when looking at its truth value.
|
|
|
|
class cm(object):
|
|
def __init__(self, bool_conversion):
|
|
class Bool:
|
|
def __nonzero__(self):
|
|
return bool_conversion()
|
|
self.exit_result = Bool()
|
|
def __enter__(self):
|
|
return 3
|
|
def __exit__(self, a, b, c):
|
|
return self.exit_result
|
|
|
|
def trueAsBool():
|
|
with cm(lambda: True):
|
|
self.fail("Should NOT see this")
|
|
trueAsBool()
|
|
|
|
def falseAsBool():
|
|
with cm(lambda: False):
|
|
self.fail("Should raise")
|
|
self.assertRaises(AssertionError, falseAsBool)
|
|
|
|
def failAsBool():
|
|
with cm(lambda: 1 // 0):
|
|
self.fail("Should NOT see this")
|
|
self.assertRaises(ZeroDivisionError, failAsBool)
|
|
|
|
|
|
class NonLocalFlowControlTestCase(unittest.TestCase):
|
|
|
|
def testWithBreak(self):
|
|
counter = 0
|
|
while True:
|
|
counter += 1
|
|
with mock_contextmanager_generator():
|
|
counter += 10
|
|
break
|
|
counter += 100 # Not reached
|
|
self.assertEqual(counter, 11)
|
|
|
|
def testWithContinue(self):
|
|
counter = 0
|
|
while True:
|
|
counter += 1
|
|
if counter > 2:
|
|
break
|
|
with mock_contextmanager_generator():
|
|
counter += 10
|
|
continue
|
|
counter += 100 # Not reached
|
|
self.assertEqual(counter, 12)
|
|
|
|
def testWithReturn(self):
|
|
def foo():
|
|
counter = 0
|
|
while True:
|
|
counter += 1
|
|
with mock_contextmanager_generator():
|
|
counter += 10
|
|
return counter
|
|
counter += 100 # Not reached
|
|
self.assertEqual(foo(), 11)
|
|
|
|
def testWithYield(self):
|
|
def gen():
|
|
with mock_contextmanager_generator():
|
|
yield 12
|
|
yield 13
|
|
x = list(gen())
|
|
self.assertEqual(x, [12, 13])
|
|
|
|
def testWithRaise(self):
|
|
counter = 0
|
|
try:
|
|
counter += 1
|
|
with mock_contextmanager_generator():
|
|
counter += 10
|
|
raise RuntimeError
|
|
counter += 100 # Not reached
|
|
except RuntimeError:
|
|
self.assertEqual(counter, 11)
|
|
else:
|
|
self.fail("Didn't raise RuntimeError")
|
|
|
|
|
|
class AssignmentTargetTestCase(unittest.TestCase):
|
|
|
|
def testSingleComplexTarget(self):
|
|
targets = {1: [0, 1, 2]}
|
|
with mock_contextmanager_generator() as targets[1][0]:
|
|
self.assertEqual(targets.keys(), [1])
|
|
self.assertEqual(targets[1][0].__class__, MockResource)
|
|
with mock_contextmanager_generator() as targets.values()[0][1]:
|
|
self.assertEqual(targets.keys(), [1])
|
|
self.assertEqual(targets[1][1].__class__, MockResource)
|
|
with mock_contextmanager_generator() as targets[2]:
|
|
keys = targets.keys()
|
|
keys.sort()
|
|
self.assertEqual(keys, [1, 2])
|
|
class C: pass
|
|
blah = C()
|
|
with mock_contextmanager_generator() as blah.foo:
|
|
self.assertEqual(hasattr(blah, "foo"), True)
|
|
|
|
def testMultipleComplexTargets(self):
|
|
class C:
|
|
def __enter__(self): return 1, 2, 3
|
|
def __exit__(self, t, v, tb): pass
|
|
targets = {1: [0, 1, 2]}
|
|
with C() as (targets[1][0], targets[1][1], targets[1][2]):
|
|
self.assertEqual(targets, {1: [1, 2, 3]})
|
|
with C() as (targets.values()[0][2], targets.values()[0][1], targets.values()[0][0]):
|
|
self.assertEqual(targets, {1: [3, 2, 1]})
|
|
with C() as (targets[1], targets[2], targets[3]):
|
|
self.assertEqual(targets, {1: 1, 2: 2, 3: 3})
|
|
class B: pass
|
|
blah = B()
|
|
with C() as (blah.one, blah.two, blah.three):
|
|
self.assertEqual(blah.one, 1)
|
|
self.assertEqual(blah.two, 2)
|
|
self.assertEqual(blah.three, 3)
|
|
|
|
|
|
class ExitSwallowsExceptionTestCase(unittest.TestCase):
|
|
|
|
def testExitTrueSwallowsException(self):
|
|
class AfricanSwallow:
|
|
def __enter__(self): pass
|
|
def __exit__(self, t, v, tb): return True
|
|
try:
|
|
with AfricanSwallow():
|
|
1 // 0
|
|
except ZeroDivisionError:
|
|
self.fail("ZeroDivisionError should have been swallowed")
|
|
|
|
def testExitFalseDoesntSwallowException(self):
|
|
class EuropeanSwallow:
|
|
def __enter__(self): pass
|
|
def __exit__(self, t, v, tb): return False
|
|
try:
|
|
with EuropeanSwallow():
|
|
1 // 0
|
|
except ZeroDivisionError:
|
|
pass
|
|
else:
|
|
self.fail("ZeroDivisionError should have been raised")
|
|
|
|
|
|
class NestedWith(unittest.TestCase):
|
|
|
|
class Dummy(object):
|
|
def __init__(self, value=None, gobble=False):
|
|
if value is None:
|
|
value = self
|
|
self.value = value
|
|
self.gobble = gobble
|
|
self.enter_called = False
|
|
self.exit_called = False
|
|
|
|
def __enter__(self):
|
|
self.enter_called = True
|
|
return self.value
|
|
|
|
def __exit__(self, *exc_info):
|
|
self.exit_called = True
|
|
self.exc_info = exc_info
|
|
if self.gobble:
|
|
return True
|
|
|
|
class InitRaises(object):
|
|
def __init__(self): raise RuntimeError()
|
|
|
|
class EnterRaises(object):
|
|
def __enter__(self): raise RuntimeError()
|
|
def __exit__(self, *exc_info): pass
|
|
|
|
class ExitRaises(object):
|
|
def __enter__(self): pass
|
|
def __exit__(self, *exc_info): raise RuntimeError()
|
|
|
|
def testNoExceptions(self):
|
|
with self.Dummy() as a, self.Dummy() as b:
|
|
self.assertTrue(a.enter_called)
|
|
self.assertTrue(b.enter_called)
|
|
self.assertTrue(a.exit_called)
|
|
self.assertTrue(b.exit_called)
|
|
|
|
def testExceptionInExprList(self):
|
|
try:
|
|
with self.Dummy() as a, self.InitRaises():
|
|
pass
|
|
except:
|
|
pass
|
|
self.assertTrue(a.enter_called)
|
|
self.assertTrue(a.exit_called)
|
|
|
|
def testExceptionInEnter(self):
|
|
try:
|
|
with self.Dummy() as a, self.EnterRaises():
|
|
self.fail('body of bad with executed')
|
|
except RuntimeError:
|
|
pass
|
|
else:
|
|
self.fail('RuntimeError not reraised')
|
|
self.assertTrue(a.enter_called)
|
|
self.assertTrue(a.exit_called)
|
|
|
|
def testExceptionInExit(self):
|
|
body_executed = False
|
|
with self.Dummy(gobble=True) as a, self.ExitRaises():
|
|
body_executed = True
|
|
self.assertTrue(a.enter_called)
|
|
self.assertTrue(a.exit_called)
|
|
self.assertTrue(body_executed)
|
|
self.assertNotEqual(a.exc_info[0], None)
|
|
|
|
def testEnterReturnsTuple(self):
|
|
with self.Dummy(value=(1,2)) as (a1, a2), \
|
|
self.Dummy(value=(10, 20)) as (b1, b2):
|
|
self.assertEquals(1, a1)
|
|
self.assertEquals(2, a2)
|
|
self.assertEquals(10, b1)
|
|
self.assertEquals(20, b2)
|
|
|
|
def test_main():
|
|
run_unittest(FailureTestCase, NonexceptionalTestCase,
|
|
NestedNonexceptionalTestCase, ExceptionalTestCase,
|
|
NonLocalFlowControlTestCase,
|
|
AssignmentTargetTestCase,
|
|
ExitSwallowsExceptionTestCase,
|
|
NestedWith)
|
|
|
|
|
|
if __name__ == '__main__':
|
|
test_main()
|