[1.6.x] Fixed #21068 -- Added some docs for DiscoverRunner

.. currentmodule:: django.test.runner

.. versionadded:: 1.6

A test runner is a class defining a ``run_tests()`` method. Django ships

with a ``DiscoverRunner`` class that defines the default Django

testing behavior. This class defines the ``run_tests()`` entry point,

plus a selection of other methods that are used to by ``run_tests()`` to

set up, execute and tear down the test suite.

with a ``DiscoverRunner`` class that defines the default Django testing

behavior. This class defines the ``run_tests()`` entry point, plus a

selection of other methods that are used to by ``run_tests()`` to set up,

execute and tear down the test suite.

.. class:: DiscoverRunner(pattern='test*.py', top_level=None, verbosity=1, interactive=True, failfast=True, **kwargs)

Attributes

~~~~~~~~~~

.. attribute:: DiscoverRunner.test_loader

    This is the class that loads tests, whether from TestCases or modules or

    otherwise and bundles them into test suites for the runner to execute.

    By default it is set to ``unittest.defaultTestLoader``. You can override

    this attribute if your tests are going to be loaded in unusual ways.

.. attribute:: DiscoverRunner.option_list

    This is the tuple of ``optparse`` options which will be fed into the