If :meth:`setUp` fails, meaning that :meth:`tearDown` is not called,

then any cleanup functions added will still be called.

.. method:: doCleanups()

:meth:`doCleanups` pops methods off the stack of cleanup

functions one at a time, so it can be called at any time.

.. class:: FunctionTestCase(testFunc, setUp=None, tearDown=None, description=None)

(for example when counting tests or comparing for equality)

so the tests returned must be the same for repeated iterations.

In earlier versions the :class:`TestSuite` accessed tests directly rather

than through iteration, so overriding :meth:`__iter__` wasn't sufficient

for providing tests.

Called once before any tests are executed.

.. method:: stopTestRun(test)

Called once before any tests are executed.

.. method:: addError(test, err)

Calling ``main`` actually returns an instance of the ``TestProgram`` class.

This stores the result of the tests run as the ``result`` attribute.

The ``exit`` parameter was added.