Allow loading test data fixtures before running tests

[eikke@…]

When using doctests as testing framework within a Django application it can be annoying no initial data is available in the database. One could use the initial_data fixture to preload some data, but this is not ideal in a production environment, as you don't want any test data in your production database, whilst you might still want to ship some initial_data which should also be loaded when initializing the application.

This results in a need to define fixtures to be loaded in the test database before the tests are started. Attached patch provides this functionality: it allows to set a TEST_FIXTURES tuple in settings.py, which will be loaded into the test database once it is created.

Eg:
TEST_FIXTURES = ('test_data', )

[eikke@…]

Implement TEST_FIXTURES functionality

[Russell Keith-Magee]

I acknowledge that doctests cannot use fixtures as easily as unit tests can; however, the solution isn't to create a global test fixture. Test fixtures are (or should be) very specific to tests, not a generic item with global applicability.

The solution to this problem is to simplify the process of defining fixtures on a per-doctest basis, not define a global test fixture. In the interim, doctest fixtures aren't *that* hard to set up manually using calls to management.call_command.