test_easy_install.py 文件源码

def test_setup_requires_overrides_version_conflict(self):
        """
        Regression test for issue #323.

        Ensures that a distribution's setup_requires requirements can still be
        installed and used locally even if a conflicting version of that
        requirement is already on the path.
        """

        pr_state = pkg_resources.__getstate__()
        fake_dist = PRDistribution('does-not-matter', project_name='foobar',
                                   version='0.0')
        working_set.add(fake_dist)

        try:
            with tempdir_context() as temp_dir:
                test_pkg = create_setup_requires_package(temp_dir)
                test_setup_py = os.path.join(test_pkg, 'setup.py')
                with quiet_context() as (stdout, stderr):
                    with reset_setup_stop_context():
                        try:
                            # Don't even need to install the package, just
                            # running the setup.py at all is sufficient
                            run_setup(test_setup_py, ['--name'])
                        except VersionConflict:
                            self.fail('Installing setup.py requirements '
                                'caused a VersionConflict')

                lines = stdout.readlines()
                self.assertTrue(len(lines) > 0)
                self.assertTrue(lines[-1].strip(), 'test_pkg')
        finally:
            pkg_resources.__setstate__(pr_state)