twisted.trial.util : API documentation

A collection of utility functions and classes, used internally by Trial.

This code is for Trial's internal use. Do NOT use this code if you are writing tests. It is subject to change at the Trial maintainer's whim. There is nothing here in this module for you to use unless you are maintaining Trial.

Any non-Trial Twisted code that uses this module will be shot.

Maintainer: Jonathan Lange

Class	DirtyReactorAggregateError	Passed to `twisted.trial.itrial.IReporter.addError` when the reactor is left in an unclean state after a test.
Function	excInfoOrFailureToExcInfo	Coerce a Failure to an _exc_info, if err is a Failure.
Function	suppress	Sets up the .suppress tuple properly, pass options to this method as you would the stdlib warnings.filterwarnings()
Function	profiled	Undocumented
Function	getPythonContainers	Walk up the Python tree from method 'meth', finding its class, its module and all containing packages.
Function	acquireAttribute	Go through the list 'objects' sequentially until we find one which has attribute 'attr', then return the value of that attribute. If not found, return 'default' if set, otherwise, raise AttributeError.
Function	findObject	Get a fully-named package, module, module-global object or attribute. Forked from twisted.python.reflect.namedAny.
Class	_Janitor	The guy that cleans up after you.
Function	_runSequentially	Run the given callables one after the other. If a callable returns a Deferred, wait until it has finished before running the next callable.
Class	_NoTrialMarker	No trial marker file could be found.
Function	_removeSafely	Safely remove a path, recursively.
Class	_WorkingDirectoryBusy	A working directory was specified to the runner, but another test run is currently using that directory.
Function	_unusedTestDirectory	Find an unused directory named similarly to `base`.

def excInfoOrFailureToExcInfo(err): (source)

Coerce a Failure to an _exc_info, if err is a Failure.

Parameters	err	Either a tuple such as returned by `sys.exc_info` or a `Failure` object.
Returns	A tuple like the one returned by `sys.exc_info`. e.g. `exception_type, exception_object, traceback_object`.

def suppress(action='ignore', **kwarg): (source)

Sets up the .suppress tuple properly, pass options to this method as you would the stdlib warnings.filterwarnings()

So, to use this with a .suppress magic attribute you would do the following:

>>> from twisted.trial import unittest, util
>>> import warnings
>>>
>>> class TestFoo(unittest.TestCase):
...     def testFooBar(self):
...         warnings.warn("i am deprecated", DeprecationWarning)
...     testFooBar.suppress = [util.suppress(message='i am deprecated')]
...
>>>

Note that as with the todo and timeout attributes: the module level attribute acts as a default for the class attribute which acts as a default for the method attribute. The suppress attribute can be overridden at any level by specifying .suppress = []

def findObject(name): (source)

Get a fully-named package, module, module-global object or attribute. Forked from twisted.python.reflect.namedAny.

Returns a tuple of (bool, obj). If bool is True, the named object exists and is returned as obj. If bool is False, the named object does not exist and the value of obj is unspecified.

def _runSequentially(callables, stopOnFirstError=False): (source)

Run the given callables one after the other. If a callable returns a Deferred, wait until it has finished before running the next callable.

Parameters	callables	An iterable of callables that take no parameters.
	stopOnFirstError	If True, then stop running callables as soon as one raises an exception or fires an errback. False by default.
Returns	A `Deferred` that fires a list of `(flag, value)` tuples. Each tuple will be either `(SUCCESS, <return value>)` or `(FAILURE, <Failure>)`.

def _removeSafely(path): (source)

Safely remove a path, recursively.

If path does not contain a node named _trial_marker, a _NoTrialmarker exception is raised and the path is not removed.

def _unusedTestDirectory(base): (source)

Find an unused directory named similarly to base.

Once a directory is found, it will be locked and a marker dropped into it to identify it as a trial temporary directory.

Parameters	base	A template path for the discovery process. If this path exactly cannot be used, a path which varies only in a suffix of the basename will be used instead. (type: `FilePath` )
Returns	A two-tuple. The first element is a `FilePath` representing the directory which was found and created. The second element is a locked `FilesystemLock`. Another call to `_unusedTestDirectory` will not be able to reused the the same name until the lock is released, either explicitly or by this process exiting.

t.t.util : module documentation