test_resources.py 文件源码

def testCollection(self):
        # empty path should produce no distributions
        ad = pkg_resources.Environment([], platform=None, python=None)
        assert list(ad) == []
        assert ad['FooPkg'] == []
        ad.add(dist_from_fn("FooPkg-1.3_1.egg"))
        ad.add(dist_from_fn("FooPkg-1.4-py2.4-win32.egg"))
        ad.add(dist_from_fn("FooPkg-1.2-py2.4.egg"))

        # Name is in there now
        assert ad['FooPkg']
        # But only 1 package
        assert list(ad) == ['foopkg']

        # Distributions sort by version
        assert [dist.version for dist in ad['FooPkg']] == ['1.4', '1.3-1', '1.2']

        # Removing a distribution leaves sequence alone
        ad.remove(ad['FooPkg'][1])
        assert [dist.version for dist in ad['FooPkg']] == ['1.4', '1.2']

        # And inserting adds them in order
        ad.add(dist_from_fn("FooPkg-1.9.egg"))
        assert [dist.version for dist in ad['FooPkg']] == ['1.9', '1.4', '1.2']

        ws = WorkingSet([])
        foo12 = dist_from_fn("FooPkg-1.2-py2.4.egg")
        foo14 = dist_from_fn("FooPkg-1.4-py2.4-win32.egg")
        req, = parse_requirements("FooPkg>=1.3")

        # Nominal case: no distros on path, should yield all applicable
        assert ad.best_match(req, ws).version == '1.9'
        # If a matching distro is already installed, should return only that
        ws.add(foo14)
        assert ad.best_match(req, ws).version == '1.4'

        # If the first matching distro is unsuitable, it's a version conflict
        ws = WorkingSet([])
        ws.add(foo12)
        ws.add(foo14)
        with pytest.raises(VersionConflict):
            ad.best_match(req, ws)

        # If more than one match on the path, the first one takes precedence
        ws = WorkingSet([])
        ws.add(foo14)
        ws.add(foo12)
        ws.add(foo14)
        assert ad.best_match(req, ws).version == '1.4'