SubClasses 
This is the base class for all test cases. Test are performed using an assertion method. If the
assertion is correct, the test passes, otherwise it fails. Most assertions take an expected
result, a received result, and a message (to describe the failure) as parameters.				
Unit tests are used to check a small unit of functionality, such as if a
method returns an expected result for a known input, or whether an adapter
can successfully open a connection.

Available assertions are (see `assert<assertion-name>` methods for details): Equal, False,
Identical, NoPattern, NotEqual, Null, Pattern, Tags, True.

If an assertion is expected to produce an exception, the `expectException` method should be
called before it.

Subclasses