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5.2.5 TestSuite Objects

`TestSuite` objects behave much like `TestCase` objects, except they do not actually implement a test. Instead, they are used to aggregate tests into groups that should be run together. Some additional methods are available to add tests to `TestSuite` instances:

`addTest`(test)
  Add a `TestCase` or `TestSuite` to the set of tests that make up the suite.

`addTests`(tests)
  Add all the tests from a sequence of `TestCase` and `TestSuite` instances to this test suite.