23.3.6 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 of tests that should be run together.
Some additional methods are available to add tests to TestSuite
Add a TestCase or TestSuite to the suite.
Add all the tests from an iterable of TestCase and
TestSuite instances to this test suite.
This is equivalent to iterating over tests, calling
addTest() for each element.
TestSuite shares the following methods with TestCase:
Run the tests associated with this suite, collecting the result into
the test result object passed as result. Note that unlike
TestCase.run(), TestSuite.run() requires the
result object to be passed in.
Run the tests associated with this suite without collecting the result.
This allows exceptions raised by the test to be propagated to the caller
and can be used to support running tests under a debugger.
Return the number of tests represented by this test object, including
all individual tests and sub-suites.
In the typical usage of a TestSuite object, the run()
method is invoked by a TestRunner rather than by the end-user
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