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Test case implementation
A test case that wraps a test function.
This is useful for slipping pre-existing test functions into the
unittest framework. Optionally, set-up and tidy-up functions can be
supplied. As with TestCase, the tidy-up ('tearDown') function will
always be called if the set-up ('setUp') function ran successfully.
Assertion failed.
with_traceback(...)
Exception.with_traceback(tb) --
set self.__traceback__ to tb and return self.
args = <attribute 'args' of 'BaseException' objects>
addClassCleanup(function, /, *args, **kwargs)
Same as addCleanup, except the cleanup items are called even if
setUpClass fails (unlike tearDownClass).
addCleanup(self, function, /, *args, **kwargs)
Add a function, with arguments, to be called when the test is
completed. Functions added are called on a LIFO basis and are
called after tearDown on test failure or success.
Cleanup items are called even if setUp fails (unlike tearDown).
addTypeEqualityFunc(self, typeobj, function)
Add a type specific assertEqual style function to compare a type.
This method is for use by TestCase subclasses that need to register
their own type equality functions to provide nicer error messages.
Args:
typeobj: The data type to call this function on when both values
are of the same type in assertEqual().
function: The callable taking two arguments and an optional
msg= argument that raises self.failureException with a
useful error message when the two arguments are not equal.
assertAlmostEqual(self, first, second, places=None, msg=None, delta=None)
Fail if the two objects are unequal as determined by their
difference rounded to the given number of decimal places
(default 7) and comparing to zero, or by comparing that the
difference between the two objects is more than the given
delta.
Note that decimal places (from zero) are usually not the same
as significant digits (measured from the most significant digit).
If the two objects compare equal then they will automatically
compare almost equal.
deprecated_func(*args, **kwargs)
assertCountEqual(self, first, second, msg=None)
Asserts that two iterables have the same elements, the same number of
times, without regard to order.
self.assertEqual(Counter(list(first)),
Counter(list(second)))
Example:
- [0, 1, 1] and [1, 0, 1] compare equal.
- [0, 0, 1] and [0, 1] compare unequal.
assertDictContainsSubset(self, subset, dictionary, msg=None) Checks whether dictionary is a superset of subset.
assertDictEqual(self, d1, d2, msg=None)
assertEqual(self, first, second, msg=None)
Fail if the two objects are unequal as determined by the '=='
operator.
deprecated_func(*args, **kwargs)
assertFalse(self, expr, msg=None) Check that the expression is false.
assertGreater(self, a, b, msg=None) Just like self.assertTrue(a > b), but with a nicer default message.
assertGreaterEqual(self, a, b, msg=None) Just like self.assertTrue(a >= b), but with a nicer default message.
assertIn(self, member, container, msg=None) Just like self.assertTrue(a in b), but with a nicer default message.
assertIs(self, expr1, expr2, msg=None) Just like self.assertTrue(a is b), but with a nicer default message.
assertIsInstance(self, obj, cls, msg=None)
Same as self.assertTrue(isinstance(obj, cls)), with a nicer
default message.
assertIsNone(self, obj, msg=None) Same as self.assertTrue(obj is None), with a nicer default message.
assertIsNot(self, expr1, expr2, msg=None) Just like self.assertTrue(a is not b), but with a nicer default message.
assertIsNotNone(self, obj, msg=None) Included for symmetry with assertIsNone.
assertLess(self, a, b, msg=None) Just like self.assertTrue(a < b), but with a nicer default message.
assertLessEqual(self, a, b, msg=None) Just like self.assertTrue(a <= b), but with a nicer default message.
assertListEqual(self, list1, list2, msg=None)
A list-specific equality assertion.
Args:
list1: The first list to compare.
list2: The second list to compare.
msg: Optional message to use on failure instead of a list of
differences.
assertLogs(self, logger=None, level=None)
Fail unless a log message of level *level* or higher is emitted
on *logger_name* or its children. If omitted, *level* defaults to
INFO and *logger* defaults to the root logger.
This method must be used as a context manager, and will yield
a recording object with two attributes: `output` and `records`.
At the end of the context manager, the `output` attribute will
be a list of the matching formatted log messages and the
`records` attribute will be a list of the corresponding LogRecord
objects.
Example::
with self.assertLogs('foo', level='INFO') as cm:
logging.getLogger('foo').info('first message')
logging.getLogger('foo.bar').error('second message')
self.assertEqual(cm.output, ['INFO:foo:first message',
'ERROR:foo.bar:second message'])
assertMultiLineEqual(self, first, second, msg=None) Assert that two multi-line strings are equal.
assertNotAlmostEqual(self, first, second, places=None, msg=None, delta=None)
Fail if the two objects are equal as determined by their
difference rounded to the given number of decimal places
(default 7) and comparing to zero, or by comparing that the
difference between the two objects is less than the given delta.
Note that decimal places (from zero) are usually not the same
as significant digits (measured from the most significant digit).
Objects that are equal automatically fail.
deprecated_func(*args, **kwargs)
assertNotEqual(self, first, second, msg=None)
Fail if the two objects are equal as determined by the '!='
operator.
deprecated_func(*args, **kwargs)
assertNotIn(self, member, container, msg=None) Just like self.assertTrue(a not in b), but with a nicer default message.
assertNotIsInstance(self, obj, cls, msg=None) Included for symmetry with assertIsInstance.
assertNotRegex(self, text, unexpected_regex, msg=None) Fail the test if the text matches the regular expression.
deprecated_func(*args, **kwargs)
assertRaises(self, expected_exception, *args, **kwargs)
Fail unless an exception of class expected_exception is raised
by the callable when invoked with specified positional and
keyword arguments. If a different type of exception is
raised, it will not be caught, and the test case will be
deemed to have suffered an error, exactly as for an
unexpected exception.
If called with the callable and arguments omitted, will return a
context object used like this::
with self.assertRaises(SomeException):
do_something()
An optional keyword argument 'msg' can be provided when assertRaises
is used as a context object.
The context manager keeps a reference to the exception as
the 'exception' attribute. This allows you to inspect the
exception after the assertion::
with self.assertRaises(SomeException) as cm:
do_something()
the_exception = cm.exception
self.assertEqual(the_exception.error_code, 3)
assertRaisesRegex(self, expected_exception, expected_regex, *args, **kwargs)
Asserts that the message in a raised exception matches a regex.
Args:
expected_exception: Exception class expected to be raised.
expected_regex: Regex (re.Pattern object or string) expected
to be found in error message.
args: Function to be called and extra positional args.
kwargs: Extra kwargs.
msg: Optional message used in case of failure. Can only be used
when assertRaisesRegex is used as a context manager.
deprecated_func(*args, **kwargs)
assertRegex(self, text, expected_regex, msg=None) Fail the test unless the text matches the regular expression.
deprecated_func(*args, **kwargs)
assertSequenceEqual(self, seq1, seq2, msg=None, seq_type=None)
An equality assertion for ordered sequences (like lists and tuples).
For the purposes of this function, a valid ordered sequence type is one
which can be indexed, has a length, and has an equality operator.
Args:
seq1: The first sequence to compare.
seq2: The second sequence to compare.
seq_type: The expected datatype of the sequences, or None if no
datatype should be enforced.
msg: Optional message to use on failure instead of a list of
differences.
assertSetEqual(self, set1, set2, msg=None)
A set-specific equality assertion.
Args:
set1: The first set to compare.
set2: The second set to compare.
msg: Optional message to use on failure instead of a list of
differences.
assertSetEqual uses ducktyping to support different types of sets, and
is optimized for sets specifically (parameters must support a
difference method).
assertTrue(self, expr, msg=None) Check that the expression is true.
assertTupleEqual(self, tuple1, tuple2, msg=None)
A tuple-specific equality assertion.
Args:
tuple1: The first tuple to compare.
tuple2: The second tuple to compare.
msg: Optional message to use on failure instead of a list of
differences.
assertWarns(self, expected_warning, *args, **kwargs)
Fail unless a warning of class warnClass is triggered
by the callable when invoked with specified positional and
keyword arguments. If a different type of warning is
triggered, it will not be handled: depending on the other
warning filtering rules in effect, it might be silenced, printed
out, or raised as an exception.
If called with the callable and arguments omitted, will return a
context object used like this::
with self.assertWarns(SomeWarning):
do_something()
An optional keyword argument 'msg' can be provided when assertWarns
is used as a context object.
The context manager keeps a reference to the first matching
warning as the 'warning' attribute; similarly, the 'filename'
and 'lineno' attributes give you information about the line
of Python code from which the warning was triggered.
This allows you to inspect the warning after the assertion::
with self.assertWarns(SomeWarning) as cm:
do_something()
the_warning = cm.warning
self.assertEqual(the_warning.some_attribute, 147)
assertWarnsRegex(self, expected_warning, expected_regex, *args, **kwargs)
Asserts that the message in a triggered warning matches a regexp.
Basic functioning is similar to assertWarns() with the addition
that only warnings whose messages also match the regular expression
are considered successful matches.
Args:
expected_warning: Warning class expected to be triggered.
expected_regex: Regex (re.Pattern object or string) expected
to be found in error message.
args: Function to be called and extra positional args.
kwargs: Extra kwargs.
msg: Optional message used in case of failure. Can only be used
when assertWarnsRegex is used as a context manager.
deprecated_func(*args, **kwargs)
countTestCases(self)
debug(self) Run the test without collecting errors in a TestResult
defaultTestResult(self)
doClassCleanups()
Execute all class cleanup functions. Normally called for you after
tearDownClass.
doCleanups(self)
Execute all cleanup functions. Normally called for you after
tearDown.
fail(self, msg=None) Fail immediately, with the given message.
deprecated_func(*args, **kwargs)
deprecated_func(*args, **kwargs)
deprecated_func(*args, **kwargs)
deprecated_func(*args, **kwargs)
deprecated_func(*args, **kwargs)
deprecated_func(*args, **kwargs)
deprecated_func(*args, **kwargs)
id(self)
run(self, result=None)
runTest(self)
setUp(self)
setUpClass() Hook method for setting up class fixture before running tests in the class.
shortDescription(self)
skipTest(self, reason) Skip this test.
subTest(self, msg=<object object at 0x7ff35fd269a0>, **params)
Return a context manager that will return the enclosed block
of code in a subtest identified by the optional message and
keyword parameters. A failure in the subtest marks the test
case as failed but resumes execution at the end of the enclosed
block, allowing further test code to be executed.
tearDown(self)
tearDownClass() Hook method for deconstructing the class fixture after running all tests in the class.
longMessage = True
maxDiff = 640
Raise this exception in a test to skip it.
Usually you can use TestCase.skipTest() or one of the skipping decorators
instead of raising this directly.
with_traceback(...)
Exception.with_traceback(tb) --
set self.__traceback__ to tb and return self.
args = <attribute 'args' of 'BaseException' objects>
A class whose instances are single test cases.
By default, the test code itself should be placed in a method named
'runTest'.
If the fixture may be used for many test cases, create as
many test methods as are needed. When instantiating such a TestCase
subclass, specify in the constructor arguments the name of the test method
that the instance is to execute.
Test authors should subclass TestCase for their own tests. Construction
and deconstruction of the test's environment ('fixture') can be
implemented by overriding the 'setUp' and 'tearDown' methods respectively.
If it is necessary to override the __init__ method, the base class
__init__ method must always be called. It is important that subclasses
should not change the signature of their __init__ method, since instances
of the classes are instantiated automatically by parts of the framework
in order to be run.
When subclassing TestCase, you can set these attributes:
* failureException: determines which exception will be raised when
the instance's assertion methods fail; test methods raising this
exception will be deemed to have 'failed' rather than 'errored'.
* longMessage: determines whether long messages (including repr of
objects used in assert methods) will be printed on failure in *addition*
to any explicit message passed.
* maxDiff: sets the maximum length of a diff in failure messages
by assert methods using difflib. It is looked up as an instance
attribute so can be configured by individual tests if required.
Assertion failed.
with_traceback(...)
Exception.with_traceback(tb) --
set self.__traceback__ to tb and return self.
args = <attribute 'args' of 'BaseException' objects>
addClassCleanup(function, /, *args, **kwargs)
Same as addCleanup, except the cleanup items are called even if
setUpClass fails (unlike tearDownClass).
addCleanup(self, function, /, *args, **kwargs)
Add a function, with arguments, to be called when the test is
completed. Functions added are called on a LIFO basis and are
called after tearDown on test failure or success.
Cleanup items are called even if setUp fails (unlike tearDown).
addTypeEqualityFunc(self, typeobj, function)
Add a type specific assertEqual style function to compare a type.
This method is for use by TestCase subclasses that need to register
their own type equality functions to provide nicer error messages.
Args:
typeobj: The data type to call this function on when both values
are of the same type in assertEqual().
function: The callable taking two arguments and an optional
msg= argument that raises self.failureException with a
useful error message when the two arguments are not equal.
assertAlmostEqual(self, first, second, places=None, msg=None, delta=None)
Fail if the two objects are unequal as determined by their
difference rounded to the given number of decimal places
(default 7) and comparing to zero, or by comparing that the
difference between the two objects is more than the given
delta.
Note that decimal places (from zero) are usually not the same
as significant digits (measured from the most significant digit).
If the two objects compare equal then they will automatically
compare almost equal.
deprecated_func(*args, **kwargs)
assertCountEqual(self, first, second, msg=None)
Asserts that two iterables have the same elements, the same number of
times, without regard to order.
self.assertEqual(Counter(list(first)),
Counter(list(second)))
Example:
- [0, 1, 1] and [1, 0, 1] compare equal.
- [0, 0, 1] and [0, 1] compare unequal.
assertDictContainsSubset(self, subset, dictionary, msg=None) Checks whether dictionary is a superset of subset.
assertDictEqual(self, d1, d2, msg=None)
assertEqual(self, first, second, msg=None)
Fail if the two objects are unequal as determined by the '=='
operator.
deprecated_func(*args, **kwargs)
assertFalse(self, expr, msg=None) Check that the expression is false.
assertGreater(self, a, b, msg=None) Just like self.assertTrue(a > b), but with a nicer default message.
assertGreaterEqual(self, a, b, msg=None) Just like self.assertTrue(a >= b), but with a nicer default message.
assertIn(self, member, container, msg=None) Just like self.assertTrue(a in b), but with a nicer default message.
assertIs(self, expr1, expr2, msg=None) Just like self.assertTrue(a is b), but with a nicer default message.
assertIsInstance(self, obj, cls, msg=None)
Same as self.assertTrue(isinstance(obj, cls)), with a nicer
default message.
assertIsNone(self, obj, msg=None) Same as self.assertTrue(obj is None), with a nicer default message.
assertIsNot(self, expr1, expr2, msg=None) Just like self.assertTrue(a is not b), but with a nicer default message.
assertIsNotNone(self, obj, msg=None) Included for symmetry with assertIsNone.
assertLess(self, a, b, msg=None) Just like self.assertTrue(a < b), but with a nicer default message.
assertLessEqual(self, a, b, msg=None) Just like self.assertTrue(a <= b), but with a nicer default message.
assertListEqual(self, list1, list2, msg=None)
A list-specific equality assertion.
Args:
list1: The first list to compare.
list2: The second list to compare.
msg: Optional message to use on failure instead of a list of
differences.
assertLogs(self, logger=None, level=None)
Fail unless a log message of level *level* or higher is emitted
on *logger_name* or its children. If omitted, *level* defaults to
INFO and *logger* defaults to the root logger.
This method must be used as a context manager, and will yield
a recording object with two attributes: `output` and `records`.
At the end of the context manager, the `output` attribute will
be a list of the matching formatted log messages and the
`records` attribute will be a list of the corresponding LogRecord
objects.
Example::
with self.assertLogs('foo', level='INFO') as cm:
logging.getLogger('foo').info('first message')
logging.getLogger('foo.bar').error('second message')
self.assertEqual(cm.output, ['INFO:foo:first message',
'ERROR:foo.bar:second message'])
assertMultiLineEqual(self, first, second, msg=None) Assert that two multi-line strings are equal.
assertNotAlmostEqual(self, first, second, places=None, msg=None, delta=None)
Fail if the two objects are equal as determined by their
difference rounded to the given number of decimal places
(default 7) and comparing to zero, or by comparing that the
difference between the two objects is less than the given delta.
Note that decimal places (from zero) are usually not the same
as significant digits (measured from the most significant digit).
Objects that are equal automatically fail.
deprecated_func(*args, **kwargs)
assertNotEqual(self, first, second, msg=None)
Fail if the two objects are equal as determined by the '!='
operator.
deprecated_func(*args, **kwargs)
assertNotIn(self, member, container, msg=None) Just like self.assertTrue(a not in b), but with a nicer default message.
assertNotIsInstance(self, obj, cls, msg=None) Included for symmetry with assertIsInstance.
assertNotRegex(self, text, unexpected_regex, msg=None) Fail the test if the text matches the regular expression.
deprecated_func(*args, **kwargs)
assertRaises(self, expected_exception, *args, **kwargs)
Fail unless an exception of class expected_exception is raised
by the callable when invoked with specified positional and
keyword arguments. If a different type of exception is
raised, it will not be caught, and the test case will be
deemed to have suffered an error, exactly as for an
unexpected exception.
If called with the callable and arguments omitted, will return a
context object used like this::
with self.assertRaises(SomeException):
do_something()
An optional keyword argument 'msg' can be provided when assertRaises
is used as a context object.
The context manager keeps a reference to the exception as
the 'exception' attribute. This allows you to inspect the
exception after the assertion::
with self.assertRaises(SomeException) as cm:
do_something()
the_exception = cm.exception
self.assertEqual(the_exception.error_code, 3)
assertRaisesRegex(self, expected_exception, expected_regex, *args, **kwargs)
Asserts that the message in a raised exception matches a regex.
Args:
expected_exception: Exception class expected to be raised.
expected_regex: Regex (re.Pattern object or string) expected
to be found in error message.
args: Function to be called and extra positional args.
kwargs: Extra kwargs.
msg: Optional message used in case of failure. Can only be used
when assertRaisesRegex is used as a context manager.
deprecated_func(*args, **kwargs)
assertRegex(self, text, expected_regex, msg=None) Fail the test unless the text matches the regular expression.
deprecated_func(*args, **kwargs)
assertSequenceEqual(self, seq1, seq2, msg=None, seq_type=None)
An equality assertion for ordered sequences (like lists and tuples).
For the purposes of this function, a valid ordered sequence type is one
which can be indexed, has a length, and has an equality operator.
Args:
seq1: The first sequence to compare.
seq2: The second sequence to compare.
seq_type: The expected datatype of the sequences, or None if no
datatype should be enforced.
msg: Optional message to use on failure instead of a list of
differences.
assertSetEqual(self, set1, set2, msg=None)
A set-specific equality assertion.
Args:
set1: The first set to compare.
set2: The second set to compare.
msg: Optional message to use on failure instead of a list of
differences.
assertSetEqual uses ducktyping to support different types of sets, and
is optimized for sets specifically (parameters must support a
difference method).
assertTrue(self, expr, msg=None) Check that the expression is true.
assertTupleEqual(self, tuple1, tuple2, msg=None)
A tuple-specific equality assertion.
Args:
tuple1: The first tuple to compare.
tuple2: The second tuple to compare.
msg: Optional message to use on failure instead of a list of
differences.
assertWarns(self, expected_warning, *args, **kwargs)
Fail unless a warning of class warnClass is triggered
by the callable when invoked with specified positional and
keyword arguments. If a different type of warning is
triggered, it will not be handled: depending on the other
warning filtering rules in effect, it might be silenced, printed
out, or raised as an exception.
If called with the callable and arguments omitted, will return a
context object used like this::
with self.assertWarns(SomeWarning):
do_something()
An optional keyword argument 'msg' can be provided when assertWarns
is used as a context object.
The context manager keeps a reference to the first matching
warning as the 'warning' attribute; similarly, the 'filename'
and 'lineno' attributes give you information about the line
of Python code from which the warning was triggered.
This allows you to inspect the warning after the assertion::
with self.assertWarns(SomeWarning) as cm:
do_something()
the_warning = cm.warning
self.assertEqual(the_warning.some_attribute, 147)
assertWarnsRegex(self, expected_warning, expected_regex, *args, **kwargs)
Asserts that the message in a triggered warning matches a regexp.
Basic functioning is similar to assertWarns() with the addition
that only warnings whose messages also match the regular expression
are considered successful matches.
Args:
expected_warning: Warning class expected to be triggered.
expected_regex: Regex (re.Pattern object or string) expected
to be found in error message.
args: Function to be called and extra positional args.
kwargs: Extra kwargs.
msg: Optional message used in case of failure. Can only be used
when assertWarnsRegex is used as a context manager.
deprecated_func(*args, **kwargs)
countTestCases(self)
debug(self) Run the test without collecting errors in a TestResult
defaultTestResult(self)
doClassCleanups()
Execute all class cleanup functions. Normally called for you after
tearDownClass.
doCleanups(self)
Execute all cleanup functions. Normally called for you after
tearDown.
fail(self, msg=None) Fail immediately, with the given message.
deprecated_func(*args, **kwargs)
deprecated_func(*args, **kwargs)
deprecated_func(*args, **kwargs)
deprecated_func(*args, **kwargs)
deprecated_func(*args, **kwargs)
deprecated_func(*args, **kwargs)
deprecated_func(*args, **kwargs)
id(self)
run(self, result=None)
setUp(self) Hook method for setting up the test fixture before exercising it.
setUpClass() Hook method for setting up class fixture before running tests in the class.
shortDescription(self)
Returns a one-line description of the test, or None if no
description has been provided.
The default implementation of this method returns the first line of
the specified test method's docstring.
skipTest(self, reason) Skip this test.
subTest(self, msg=<object object at 0x7ff35fd269a0>, **params)
Return a context manager that will return the enclosed block
of code in a subtest identified by the optional message and
keyword parameters. A failure in the subtest marks the test
case as failed but resumes execution at the end of the enclosed
block, allowing further test code to be executed.
tearDown(self) Hook method for deconstructing the test fixture after testing it.
tearDownClass() Hook method for deconstructing the class fixture after running all tests in the class.
longMessage = True
maxDiff = 640
addModuleCleanup(function, /, *args, **kwargs)
Same as addCleanup, except the cleanup items are called even if
setUpModule fails (unlike tearDownModule).
doModuleCleanups()
Execute all module cleanup functions. Normally called for you after
tearDownModule.
expectedFailure(test_item)
safe_repr(obj, short=False)
skip(reason)
Unconditionally skip a test.
skipIf(condition, reason)
Skip a test if the condition is true.
skipUnless(condition, reason)
Skip a test unless the condition is true.
strclass(cls)
DIFF_OMITTED = '\nDiff is %s characters long. Set self.maxDiff to None to see it.'