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This method is helpful for *some* test environments, but as
the docs mention, 'unittest.py' aims to provide only
functionality common to all testing environments.

What usually happens is that each project has its own
'BaseTestCase' class that provides site-specific add-ons
(such as 'getPath()').

I will keep this patch and use it later in documentation to
illustrate the principle of customising a base TestCase
subclass for a specific test environment.