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gh-62432: unittest runner: Exit code 5 if no tests were run (#102051)

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As discussed in https://discuss.python.org/t/unittest-fail-if-zero-tests-were-discovered/21498/7

It is common for test runner misconfiguration to fail to find any tests,
This should be an error.

Fixes: #62432
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Stefano Rivera 2023-04-26 18:28:46 -07:00 • committed by GitHub
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commit 76632b836c
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Doc/library/unittest.rst
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@ -2281,7 +2281,8 @@ Loading and running tests
The *testRunner* argument can either be a test runner class or an already
created instance of it. By default ``main`` calls :func:`sys.exit` with
an exit code indicating success or failure of the tests run.
an exit code indicating success (0) or failure (1) of the tests run.
An exit code of 5 indicates that no tests were run.
The *testLoader* argument has to be a :class:`TestLoader` instance,
and defaults to :data:`defaultTestLoader`.