test_resources.py 文件源码

def test_two_levels_deep(self, symlinked_tmpdir):
        """
        Test nested namespace packages
        Create namespace packages in the following tree :
            site-packages-1/pkg1/pkg2
            site-packages-2/pkg1/pkg2
        Check both are in the _namespace_packages dict and that their __path__
        is correct
        """
        real_tmpdir = symlinked_tmpdir.realpath()
        tmpdir = symlinked_tmpdir
        sys.path.append(str(tmpdir / 'site-pkgs2'))
        site_dirs = tmpdir / 'site-pkgs', tmpdir / 'site-pkgs2'
        for site in site_dirs:
            pkg1 = site / 'pkg1'
            pkg2 = pkg1 / 'pkg2'
            pkg2.ensure_dir()
            (pkg1 / '__init__.py').write_text(self.ns_str, encoding='utf-8')
            (pkg2 / '__init__.py').write_text(self.ns_str, encoding='utf-8')
        import pkg1
        assert "pkg1" in pkg_resources._namespace_packages
        # attempt to import pkg2 from site-pkgs2
        import pkg1.pkg2
        # check the _namespace_packages dict
        assert "pkg1.pkg2" in pkg_resources._namespace_packages
        assert pkg_resources._namespace_packages["pkg1"] == ["pkg1.pkg2"]
        # check the __path__ attribute contains both paths
        expected = [
            str(real_tmpdir / "site-pkgs" / "pkg1" / "pkg2"),
            str(real_tmpdir / "site-pkgs2" / "pkg1" / "pkg2"),
        ]
        assert pkg1.pkg2.__path__ == expected