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

Part of twisted.trial.unittest View Source View In Hierarchy

Known subclasses: twisted.trial.unittest._SubTestCase

Implements interfaces: twisted.trial.itrial.ITestCase

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

This class extends unittest.TestCase from the standard library. The main feature is the ability to return Deferreds from tests and fixture methods and to have the suite wait for those Deferreds to fire.

To write a unit test, subclass TestCase 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 TestCase 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 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.
Instance Variable timeout A real number of seconds. If set, the test will raise an error if it takes longer than timeout seconds. If not set, util.DEFAULT_TIMEOUT_DURATION is used.
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.
Method __init__ Construct an asynchronous test case for methodName.
Method __eq__ Undocumented
Method __ne__ Undocumented
Method shortDescription Return a short description of the test.
Method __call__ Run the test. Should always do exactly the same thing as run().
Method deferSetUp Undocumented
Method deferTestMethod Undocumented
Method deferTearDown Undocumented
Method deferRunCleanups Run any scheduled cleanups and report errors (if any to the result object.
Method flushLoggedErrors Remove stored errors received from the log.
Method flushWarnings Remove stored warnings from the list of captured warnings and return them.
Method addCleanup Add the given function to a list of functions to be called after the test has run, but before tearDown.
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 patch Monkey patch an object for the duration of the test.
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 getSkip No summary
Method getTodo No summary
Method getTimeout No summary
Method getSuppress No summary
Method visit Visit this test case. Call visitor with self as a parameter.
Method mktemp Returns a unique name that may be used as either a temporary directory or filename.
Method _run Undocumented
Method _ebDeferSetUp Undocumented
Method _cbDeferTestMethod Undocumented
Method _ebDeferTestMethod Undocumented
Method _ebDeferTearDown Undocumented
Method _cbDeferRunCleanups Undocumented
Method _cleanUp Undocumented
Method _classCleanUp Undocumented
Method _makeReactorMethod Create a method which wraps the reactor method name. The new method issues a deprecation warning and calls the original.
Method _deprecateReactor Deprecate iterate, crash and stop on reactor. That is, each method is wrapped in a function that issues a deprecation warning, then calls the original.
Method _undeprecateReactor Restore the deprecated reactor methods. Undoes what _deprecateReactor did.
Method _installObserver Undocumented
Method _removeObserver Undocumented
Method _runCleanups Run the cleanups added with addCleanup in order.
Method _getReason Undocumented
Method _wait Take a Deferred that only ever callbacks. Block until it happens.

Inherited from _Assertions:

Method fail Absolutely fail the test. Do not pass go, do not collect $200.
Method failIf Fail the test if condition evaluates to True.
Method failUnless Fail the test if condition evaluates to False.
Method failUnlessRaises 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 failUnlessIdentical Fail the test if first is not second. This is an obect-identity-equality test, not an object equality (i.e. __eq__) test.
Method failIfIdentical Fail the test if first is second. This is an obect-identity-equality test, not an object equality (i.e. __eq__) test.
Method failIfEqual Fail the test if first == second.
Method failUnlessIn Fail the test if containee is not found in container.
Method failIfIn Fail the test if containee is found in container.
Method failIfAlmostEqual 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 failUnlessAlmostEqual 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 failUnlessApproximates Fail if first - second > tolerance
Method failUnlessFailure Fail if deferred does not errback with one of expectedFailures. Returns the original Deferred with callbacks added. You will need to return this Deferred from your test case.
Method failUnlessSubstring Fail if substring does not exist within astring.
Method failIfSubstring Fail if astring contains substring.
Method failUnlessWarns 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 failUnlessIsInstance Fail if instance is not an instance of the given class or of one of the given classes.
Method failIfIsInstance Fail if instance is not an instance of the given class or of one of the given classes.
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.
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).
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.
timeout =
A real number of seconds. If set, the test will raise an error if it takes longer than timeout seconds. If not set, util.DEFAULT_TIMEOUT_DURATION is used.
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.
def __init__(self, methodName='runTest'): (source)
Construct an asynchronous test case for methodName.
ParametersmethodNameThe name of a method on self. This method should be a unit test. That is, it should be a short method that calls some of the assert* methods. If methodName is unspecified, runTest will be used as the test method. This is mostly useful for testing Trial.
def __eq__(self, other): (source)
Undocumented
def __ne__(self, other): (source)
Undocumented
def _run(self, methodName, result): (source)
Undocumented
def shortDescription(self): (source)
Return a short description of the test.
def __call__(self, *args, **kwargs): (source)
Run the test. Should always do exactly the same thing as run().
def deferSetUp(self, ignored, result): (source)
Undocumented
def _ebDeferSetUp(self, failure, result): (source)
Undocumented
def deferTestMethod(self, ignored, result): (source)
Undocumented
def _cbDeferTestMethod(self, ignored, result): (source)
Undocumented
def _ebDeferTestMethod(self, f, result): (source)
Undocumented
def deferTearDown(self, ignored, result): (source)
Undocumented
def _ebDeferTearDown(self, failure, result): (source)
Undocumented
def deferRunCleanups(self, ignored, result): (source)
Run any scheduled cleanups and report errors (if any to the result object.
def _cbDeferRunCleanups(self, cleanupResults, result): (source)
Undocumented
def _cleanUp(self, result): (source)
Undocumented
def _classCleanUp(self, result): (source)
Undocumented
def _makeReactorMethod(self, name): (source)
Create a method which wraps the reactor method name. The new method issues a deprecation warning and calls the original.
def _deprecateReactor(self, reactor): (source)
Deprecate iterate, crash and stop on reactor. That is, each method is wrapped in a function that issues a deprecation warning, then calls the original.
ParametersreactorThe Twisted reactor.
def _undeprecateReactor(self, reactor): (source)
Restore the deprecated reactor methods. Undoes what _deprecateReactor did.
ParametersreactorThe Twisted reactor.
def _installObserver(self): (source)
Undocumented
def _removeObserver(self): (source)
Undocumented
def flushLoggedErrors(self, *errorTypes): (source)
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*errorTypesIf unspecifed, flush all errors. Otherwise, only flush errors that match the given types.
ReturnsA list of failures that have been removed.
def flushWarnings(self, offendingFunctions=None): (source)
Remove stored warnings from the list of captured warnings and return them.
ParametersoffendingFunctionsIf 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.)
ReturnsA 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.
RaisesValueErrorIf offendingFunctions is not None and includes an object which is not a FunctionType or MethodType instance.
def addCleanup(self, f, *args, **kwargs): (source)
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.

The function f may return a Deferred. If so, TestCase will wait until the Deferred has fired before proceeding to the next function.

def callDeprecated(self, version, f, *args, **kwargs): (source)
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.
ParametersversionA 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.
fThe deprecated function to call.
argsThe arguments to pass to f.
kwargsThe keyword arguments to pass to f.
ReturnsWhatever f returns.
RaisesWhatever f raises. If any exception is raised by f, though, no assertions will be made about emitted deprecations.
FailTestif 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.
def _runCleanups(self): (source)
Run the cleanups added with addCleanup in order.
ReturnsA Deferred that fires when all cleanups are run.
def patch(self, obj, attribute, value): (source)
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 MonkeyPatcher is returned so that users can restore and re-apply the monkey patch within their tests.

ParametersobjThe object to monkey patch.
attributeThe name of the attribute to change.
valueThe value to set the attribute to.
ReturnsA monkey.MonkeyPatcher object.
def runTest(self): (source)
If no methodName argument is passed to the constructor, run will treat this method as the thing with the actual test inside.
def run(self, result): (source)
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. Any of these may return Deferreds. After they complete, does some reactor cleanup.

ParametersresultA TestResult object.
def _getReason(self, f): (source)
Undocumented
def getSkip(self): (source)
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.
def getTodo(self): (source)
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.
def getTimeout(self): (source)
Returns the timeout value set on this test. Checks on the instance first, then the class, then the module, then packages. As soon as it finds something with a timeout attribute, returns that. Returns util.DEFAULT_TIMEOUT_DURATION if it cannot find anything. See TestCase docstring for more details.
def getSuppress(self): (source)
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.
def visit(self, visitor): (source)
Visit this test case. Call visitor with self as a parameter.

Deprecated in Twisted 8.0.

ParametersvisitorA callable which expects a single parameter: a test case.
ReturnsNone
def mktemp(self): (source)
Returns a unique name that may be used as either a temporary directory or filename.
Noteyou must call os.mkdir on the value returned from this method if you wish to use it as a directory!
def _wait(self, d, running=_wait_is_running): (source)
Take a Deferred that only ever callbacks. Block until it happens.
API Documentation for Twisted, generated by pydoctor at 2012-06-04 17:20:01.