twisted.trial.unittest.SynchronousTestCase : API documentation

A unit test. The atom of the unit testing universe.

This class extends unittest.TestCase from the standard library. A number of convenient testing helpers are added, including logging and warning integration, monkey-patching support, and more.

To write a unit test, subclass SynchronousTestCase and define a method (say, 'test_foo') on the subclass. To run the test, instantiate your subclass with the name of the method, and call run on the instance, passing a TestResult object.

The trial script will automatically find any SynchronousTestCase subclasses defined in modules beginning with 'test_' and construct test cases for all methods beginning with 'test'.

If an error is logged during the test run, the test will fail with an error. See log.err.

Instance Variable	failureException	An exception class, defaulting to `FailTest`. If the test method raises this exception, it will be reported as a failure, rather than an exception. All of the assertion methods raise this if the assertion fails.
Instance Variable	skip	`None` or a string explaining why this test is to be skipped. If defined, the test will not be run. Instead, it will be reported to the result object as 'skipped' (if the `TestResult` supports skipping).
Instance Variable	todo	`None`, a string or a tuple of `(errors, reason)` where `errors` is either an exception class or an iterable of exception classes, and `reason` is a string. See `Todo` or `makeTodo` for more information.
Instance Variable	suppress	`None` or a list of tuples of `(args, kwargs)` to be passed to `warnings.filterwarnings`. Use these to suppress warnings raised in a test. Useful for testing deprecated code. See also `util.suppress`.
Method	__init__	Undocumented
Method	__eq__	Undocumented
Method	__ne__	Undocumented
Method	__hash__	Undocumented
Method	shortDescription	Undocumented
Method	getSkip	No summary
Method	getTodo	No summary
Method	runTest	If no `methodName` argument is passed to the constructor, `run` will treat this method as the thing with the actual test inside.
Method	run	Run the test case, storing the results in `result`.
Method	addCleanup	Add the given function to a list of functions to be called after the test has run, but before `tearDown`.
Method	patch	Monkey patch an object for the duration of the test.
Method	flushLoggedErrors	Remove stored errors received from the log.
Method	flushWarnings	Remove stored warnings from the list of captured warnings and return them.
Method	callDeprecated	Call a function that should have been deprecated at a specific version and in favor of a specific alternative, and assert that it was thusly deprecated.
Method	mktemp	Create a new path name which can be used for a new file or directory.
Method	_getSuppress	No summary
Method	_getSkipReason	Return the reason to use for skipping a test method.
Method	_run	Run a single method, either a test method or fixture.
Method	_runFixturesAndTest	Run `setUp`, a test method, test cleanups, and `tearDown`.
Method	_runCleanups	Synchronously run any cleanups which have been added.
Method	_installObserver	Undocumented
Method	_removeObserver	Undocumented

Inherited from _Assertions:

Method	fail	Absolutely fail the test. Do not pass go, do not collect $200.
Method	assertFalse	Fail the test if `condition` evaluates to True.
Method	assertTrue	Fail the test if `condition` evaluates to False.
Method	assertRaises	Fail the test unless calling the function `f` with the given `args` and `kwargs` raises `exception`. The failure will report the traceback and call stack of the unexpected exception.
Method	assertEqual	Fail the test if `first` and `second` are not equal.
Method	assertIs	Fail the test if `first` is not `second`. This is an obect-identity-equality test, not an object equality (i.e. `__eq__`) test.
Method	assertIsNot	Fail the test if `first` is `second`. This is an obect-identity-equality test, not an object equality (i.e. `__eq__`) test.
Method	assertNotEqual	Fail the test if `first` == `second`.
Method	assertIn	Fail the test if `containee` is not found in `container`.
Method	assertNotIn	Fail the test if `containee` is found in `container`.
Method	assertNotAlmostEqual	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.
Method	assertAlmostEqual	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.
Method	assertApproximates	Fail if `first` - `second` > `tolerance`
Method	assertSubstring	Fail if `substring` does not exist within `astring`.
Method	assertNotSubstring	Fail if `astring` contains `substring`.
Method	assertWarns	Fail if the given function doesn't generate the specified warning when called. It calls the function, checks the warning, and forwards the result of the function if everything is fine.
Method	assertIsInstance	Fail if `instance` is not an instance of the given class or of one of the given classes.
Method	assertNotIsInstance	Fail if `instance` is an instance of the given class or of one of the given classes.
Method	successResultOf	Return the current success result of `deferred` or raise `self.failureException`.
Method	failureResultOf	Return the current failure result of `deferred` or raise `self.failureException`.
Method	assertNoResult	Assert that `deferred` does not have a result at this point.

Return the skip reason set on this test, if any is set. Checks on the instance first, then the class, then the module, then packages. As soon as it finds something with a skip attribute, returns that. Returns None if it cannot find anything. See TestCase docstring for more details.

Return a Todo object if the test is marked todo. Checks on the instance first, then the class, then the module, then packages. As soon as it finds something with a todo attribute, returns that. Returns None if it cannot find anything. See TestCase docstring for more details.

If no methodName argument is passed to the constructor, run will treat this method as the thing with the actual test inside.

Run the test case, storing the results in result.

First runs setUp on self, then runs the test method (defined in the constructor), then runs tearDown. As with the standard library unittest.TestCase, the return value of these methods is disregarded. In particular, returning a Deferred has no special additional consequences.

Parameters result A TestResult object.

Add the given function to a list of functions to be called after the test has run, but before tearDown.

Functions will be run in reverse order of being added. This helps ensure that tear down complements set up.

As with all aspects of SynchronousTestCase, Deferreds are not supported in cleanup functions.

Monkey patch an object for the duration of the test.

The monkey patch will be reverted at the end of the test using the addCleanup mechanism.

The monkey.MonkeyPatcher is returned so that users can restore and re-apply the monkey patch within their tests.

Parameters	obj	The object to monkey patch.
	attribute	The name of the attribute to change.
	value	The value to set the attribute to.
Returns	A `monkey.MonkeyPatcher` object.

Remove stored errors received from the log.

TestCase stores each error logged during the run of the test and reports them as errors during the cleanup phase (after tearDown).

Parameters	*errorTypes	If unspecifed, flush all errors. Otherwise, only flush errors that match the given types.
Returns	A list of failures that have been removed.

Remove stored warnings from the list of captured warnings and return them.

Parameters	offendingFunctions	If `None`, all warnings issued during the currently running test will be flushed. Otherwise, only warnings which point to a function included in this list will be flushed. All warnings include a filename and source line number; if these parts of a warning point to a source line which is part of a function, then the warning points to that function. (type: `NoneType` or `list` of functions or methods.)
Returns	A `list`, each element of which is a `dict` giving information about one warning which was flushed by this call. The keys of each `dict` are: `'message'`: The string which was passed as the message parameter to `warnings.warn`. `'category'`: The warning subclass which was passed as the category parameter to `warnings.warn`. `'filename'`: The name of the file containing the definition of the code object which was `stacklevel` frames above the call to `warnings.warn`, where `stacklevel` is the value of the `stacklevel` parameter passed to `warnings.warn`. `'lineno'`: The source line associated with the active instruction of the code object object which was `stacklevel` frames above the call to `warnings.warn`, where `stacklevel` is the value of the `stacklevel` parameter passed to `warnings.warn`.
Raises	ValueError	If `offendingFunctions` is not `None` and includes an object which is not a `types.FunctionType` or `types.MethodType` instance.

Call a function that should have been deprecated at a specific version and in favor of a specific alternative, and assert that it was thusly deprecated.

Parameters	version	A 2-sequence of (since, replacement), where `since` is a the first `version` that `f` should have been deprecated since, and `replacement` is a suggested replacement for the deprecated functionality, as described by `twisted.python.deprecate.deprecated`. If there is no suggested replacement, this parameter may also be simply a `version` by itself.
	f	The deprecated function to call.
	args	The arguments to pass to `f`.
	kwargs	The keyword arguments to pass to `f`.
Returns	Whatever `f` returns.
Raises	Whatever `f` raises. If any exception is raised by `f`, though, no assertions will be made about emitted deprecations.
	FailTest	if no warnings were emitted by `f`, or if the `DeprecationWarning` emitted did not produce the canonical please-use-something-else message that is standard for Twisted deprecations according to the given version and replacement.

Create a new path name which can be used for a new file or directory.

The result is a relative path that is guaranteed to be unique within the current working directory. The parent of the path will exist, but the path will not.

For a temporary directory call os.mkdir on the path. For a temporary file just create the file (e.g. by opening the path for writing and then closing it).

Returns The newly created path (type: str)

Returns any warning suppressions set for this test. Checks on the instance first, then the class, then the module, then packages. As soon as it finds something with a suppress attribute, returns that. Returns any empty list (i.e. suppress no warnings) if it cannot find anything. See TestCase docstring for more details.

Return the reason to use for skipping a test method.

Parameters	method	The method which produced the skip.
	skip	A `SkipTest` instance raised by `method`.

Run a single method, either a test method or fixture.

Parameters	suppress	Any warnings to suppress, as defined by the `suppress` attribute on this method, test case, or the module it is defined in.
	todo	Any expected failure or failures, as defined by the `todo` attribute on this method, test case, or the module it is defined in.
	method	The method to run.
	result	The TestResult instance to which to report results.
Returns	`True` if the method fails and no further method/fixture calls should be made, `False` otherwise.

Run setUp, a test method, test cleanups, and tearDown.

Parameters result The TestResult instance to which to report results.

Synchronously run any cleanups which have been added.

t.t.u.SynchronousTestCase(_Assertions) : class documentation