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

Variable DEFAULT_TIMEOUT_DURATION The default timeout which will be applied to asynchronous (ie, Deferred-returning) test methods, in seconds.
Class DirtyReactorAggregateError Passed to twisted.trial.itrial.IReporter.addError when the reactor is left in an unclean state after a test.
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 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
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.
Function _listToPhrase Produce a string containing each thing in things, separated by a delimiter, with the last couple being separated by finalDelimiter
DEFAULT_TIMEOUT_DURATION =
The default timeout which will be applied to asynchronous (ie, Deferred-returning) test methods, in seconds.
def acquireAttribute(objects, attr, default=_DEFAULT):

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.

def excInfoOrFailureToExcInfo(err):

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

ParameterserrEither a tuple such as returned by sys.exc_info or a Failure object.
ReturnsA tuple like the one returned by sys.exc_info. e.g. exception_type, exception_object, traceback_object.
def suppress(action='ignore', **kwarg):

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 profiled(f, outputFile):
Undocumented
@defer.inlineCallbacks
def _runSequentially(callables, stopOnFirstError=False):

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

ParameterscallablesAn iterable of callables that take no parameters.
stopOnFirstErrorIf True, then stop running callables as soon as one raises an exception or fires an errback. False by default.
ReturnsA Deferred that fires a list of (flag, value) tuples. Each tuple will be either (SUCCESS, <return value>) or (FAILURE, <Failure>).
def _removeSafely(path):

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):

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.

ParametersbaseA 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)
ReturnsA 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 same name until the lock is released, either explicitly or by this process exiting.
def _listToPhrase(things, finalDelimiter, delimiter=', '):

Produce a string containing each thing in things, separated by a delimiter, with the last couple being separated by finalDelimiter

ParametersthingsThe elements of the resulting phrase (type: list or tuple)
finalDelimiterWhat to put between the last two things (typically 'and' or 'or') (type: str)
delimiterThe separator to use between each thing, not including the last two. Should typically include a trailing space. (type: str)
ReturnsThe resulting phrase (type: str)
API Documentation for twisted, generated by pydoctor at 2020-03-25 17:34:30.