Fixed #25351 -- Added example for database test settings to docs.

Default: ``{}``

A dictionary of settings for test databases; for more details about the

creation and use of test databases, see :ref:`the-test-database`. The

following entries are available:

creation and use of test databases, see :ref:`the-test-database`.

Here's an example with a test database configuration::

    DATABASES = {

        'default': {

            'ENGINE': 'django.db.backends.postgresql',

            'USER': 'mydatabaseuser',

            'NAME': 'mydatabase',

            'TEST': {

                'NAME': 'mytestdatabase',

            },

        },

    }

The following keys in the ``TEST`` dictionary are available:

.. setting:: TEST_CHARSET