test_resources.py 文件源码

def testCollection(self):
        # empty path should produce no distributions
        ad = pkg_resources.Environment([], platform=None, python=None)
        self.assertEqual(list(ad), [])
        self.assertEqual(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
        self.assertTrue(ad['FooPkg'])
        # But only 1 package
        self.assertEqual(list(ad), ['foopkg'])

        # Distributions sort by version
        self.assertEqual(
            [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])
        self.assertEqual(
            [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"))
        self.assertEqual(
            [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
        self.assertEqual(ad.best_match(req,ws).version, '1.9')
        # If a matching distro is already installed, should return only that
        ws.add(foo14)
        self.assertEqual(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)
        self.assertRaises(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)
        self.assertEqual(ad.best_match(req,ws).version, '1.4')