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Tests for assertions provided by C{SynchronousTestCase} and C{TestCase},
provided by L{twisted.trial.unittest}.
L{TestFailureTests} demonstrates that L{SynchronousTestCase.fail} works, so that
is the only method on C{twisted.trial.unittest.SynchronousTestCase} that is
initially assumed to work. The test classes are arranged so that the methods
demonstrated to work earlier in the file are used by those later in the file
(even though the runner will probably not run the tests in this order).
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Tests for the most basic functionality of L{SynchronousTestCase}, for
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Tests for L{SynchronousTestCase}'s C{assertFalse} and C{failIf} assertion
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L{assertIs} passes if two objects are identical.
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