Method test_unload_tests

Lib/test/test_regrtest.py:2213–2230

(self)

                                  stats=len(tests), parallel=True)

    def test_unload_tests(self):
        # Test that unloading test modules does not break tests
        # that import from other tests.
        # The test execution order matters for this test.
        # Both test_regrtest_a and test_regrtest_c which are executed before
        # and after test_regrtest_b import a submodule from the test_regrtest_b
        # package and use it in testing. test_regrtest_b itself does not import
        # that submodule.
        # Previously test_regrtest_c failed because test_regrtest_b.util in
        # sys.modules was left after test_regrtest_a (making the import
        # statement no-op), but new test_regrtest_b without the util attribute
        # was imported for test_regrtest_b.
        testdir = os.path.join(os.path.dirname(__file__),
                               'regrtestdata', 'import_from_tests')
        tests = [f'test_regrtest_{name}' for name in ('a', 'b', 'c')]
        args = ['-Wd', '-E', '-bb', '-m', 'test', '--testdir=%s' % testdir, *tests]
        output = self.run_python(args)
        self.check_executed_tests(output, tests, stats=3)

    def check_add_python_opts(self, option):
        # --fast-ci and --slow-ci add "-u -W default -bb -E" options to Python