Use simple asserts. pytest handles this nicely. Removes broken _assertIn.

setuptools/tests/test_resources.py

@@ -575,13 +575,6 @@ class NamespaceTests(TestCase):
         pkg_resources._namespace_packages = self._ns_pkgs.copy()
         sys.path = self._prev_sys_path[:]
 
-    def _assertIn(self, member, container):
-        """ assertIn and assertTrue does not exist in Python2.3"""
-        if member not in container:
-            standardMsg = '%s not found in %s' % (safe_repr(member),
-                                                  safe_repr(container))
-            self.fail(self._formatMessage(msg, standardMsg))
-
     def test_two_levels_deep(self):
         """
         Test nested namespace packages
@@ -605,13 +598,13 @@ class NamespaceTests(TestCase):
             pkg2_init.write(ns_str)
             pkg2_init.close()
         import pkg1
-        self._assertIn("pkg1", pkg_resources._namespace_packages.keys())
+        assert "pkg1" in pkg_resources._namespace_packages
         try:
             import pkg1.pkg2
         except ImportError:
             self.fail("Setuptools tried to import the parent namespace package")
         # check the _namespace_packages dict
-        self._assertIn("pkg1.pkg2", pkg_resources._namespace_packages.keys())
+        assert "pkg1.pkg2" in pkg_resources._namespace_packages
         self.assertEqual(pkg_resources._namespace_packages["pkg1"], ["pkg1.pkg2"])
         # check the __path__ attribute contains both paths
         self.assertEqual(pkg1.pkg2.__path__, [