test_resources.py 文件源码

def test_marker_evaluation_with_extras_loop(self):
        ad = pkg_resources.Environment([])
        ws = WorkingSet([])
        a = Distribution.from_filename(
            "/foo_dir/a-0.2.dist-info",
            metadata=Metadata(("METADATA", "Requires-Dist: c[a]"))
        )
        b = Distribution.from_filename(
            "/foo_dir/b-0.3.dist-info",
            metadata=Metadata(("METADATA", "Requires-Dist: c[b]"))
        )
        c = Distribution.from_filename(
            "/foo_dir/c-1.0.dist-info",
            metadata=Metadata(("METADATA", "Provides-Extra: a\n"
                               "Requires-Dist: b;extra=='a'\n"
                               "Provides-Extra: b\n"
                               "Requires-Dist: foo;extra=='b'"))
        )
        foo = Distribution.from_filename("/foo_dir/foo-0.1.dist-info")
        for dist in (a, b, c, foo):
            ad.add(dist)
        res = list(ws.resolve(parse_requirements("a"), ad))
        assert res == [a, c, b, foo]