Stop comparing repr()'s in TestEntryPoint

In Python 3, the default order of iterables can not determined,
so comparing the repr of objects that include tuples is not static
like it is under Python 2. Compare the attributes of EntryPoint
instead, making sure to sort .attrs and .extras.

Closes: #526

pkg_resources/tests/test_resources.py

@@ -382,7 +382,10 @@ class TestEntryPoints:
     def checkSubMap(self, m):
         assert len(m) == len(self.submap_expect)
         for key, ep in self.submap_expect.items():
-            assert repr(m.get(key)) == repr(ep)
+            assert m.get(key).name == ep.name
+            assert m.get(key).module_name == ep.module_name
+            assert sorted(m.get(key).attrs) == sorted(ep.attrs)
+            assert sorted(m.get(key).extras) == sorted(ep.extras)
 
     submap_expect = dict(
         feature1=EntryPoint('feature1', 'somemodule', ['somefunction']),