testtools : API documentation

Module	assertions	No module docstring; 1/1 functions documented
Module	compat	Compatibility support for python 2 and 3.
Module	content	Content - a MIME-like Content object.
Module	content_type	ContentType - a MIME Content Type.
Module	deferredruntest	Individual test case execution for tests that return Deferreds.
Module	distutilscmd	Extensions to the standard Python unittest library.
Module	helpers	No module docstring; 4/4 functions documented
Package	matchers	All the matchers.
Module	monkey	Helpers for monkey-patching Python code.
Module	run	python -m testtools.run testspec [testspec...]
Module	runtest	Individual test case execution.
Module	tags	Tag support.
Module	testcase	Test case related stuff.
Package	testresult	Test result objects.
Package	tests	Tests for testtools itself.
Module	testsuite	Test suites and related things.
Module	utils	Utilities for dealing with stuff in unittest.
Module	_compat2x	Compatibility helpers that are valid syntax in Python 2.x.
Module	_compat3x	Compatibility helpers that are valid syntax in Python 3.x.
Module	_spinner	Evil reactor-spinning logic for running Twisted tests.

From the __init__.py module:

Class	DecorateTestCaseResult	Decorate a TestCase and permit customisation of the result for runs.
Function	ErrorHolder	Construct an `ErrorHolder`.
Class	FixtureSuite	Undocumented
Class	PlaceHolder	A placeholder test.
Class	TestCommand	Command to run unit tests with testtools

def ErrorHolder(test_id, error, short_description=None, details=None):

Construct an ErrorHolder.

Parameters	test_id	The id of the test.
	error	The exc info tuple that will be used as the test's error. This is inserted into the details as 'traceback' - any existing key will be overridden.
	short_description	An optional short description of the test.
	details	Outcome details as accepted by addSuccess etc.

testtools package documentation