Workaround for tests in Python 3.4

related bug: http://bugs.python.org/issue21750

Author: bayandin

jsonschema/tests/test_cli.py

@@ -22,10 +22,16 @@ class TestParser(unittest.TestCase):
     FakeValidator = fake_validator()
 
     def setUp(self):
-        self.open = mock.mock_open(read_data='{}')
-        patch = mock.patch.object(cli, "open", self.open, create=True)
-        patch.start()
-        self.addCleanup(patch.stop)
+        mock_open = mock.mock_open()
+        patch_open = mock.patch.object(cli, "open", mock_open, create=True)
+        patch_open.start()
+        self.addCleanup(patch_open.stop)
+
+        mock_json_load = mock.Mock()
+        mock_json_load.return_value = {}
+        patch_json_load = mock.patch("json.load")
+        patch_json_load.start()
+        self.addCleanup(patch_json_load.stop)
 
     def test_find_validator_by_fully_qualified_object_name(self):
         arguments = cli.parse_args(