test_resources.py 文件源码

def test_marker_evaluation_with_extras(self):
        """Extras are also evaluated as markers at resolution time."""
        ad = pkg_resources.Environment([])
        ws = WorkingSet([])
        # Metadata needs to be native strings due to cStringIO behaviour in
        # 2.6, so use str().
        Foo = Distribution.from_filename(
            "/foo_dir/Foo-1.2.dist-info",
            metadata=Metadata(("METADATA", str("Provides-Extra: baz\n"
                               "Requires-Dist: quux; extra=='baz'")))
        )
        ad.add(Foo)
        assert list(ws.resolve(parse_requirements("Foo"), ad)) == [Foo]
        quux = Distribution.from_filename("/foo_dir/quux-1.0.dist-info")
        ad.add(quux)
        res = list(ws.resolve(parse_requirements("Foo[baz]"), ad))
        assert res == [Foo, quux]