cleaning up

changelog/3632.feature.rst

@@ -1 +1 @@
-Provide richer comparison on ``AssertionError`` for objects created using `dataclasses <https://docs.python.org/3/library/dataclasses.html>`_ (Python 3.7+) or `attrs package <http://www.attrs.org/en/stable/>`_.
+Richer comparison information on ``AssertionError`` for objects created using `attrs <http://www.attrs.org/en/stable/>`_ or `dataclasses <https://docs.python.org/3/library/dataclasses.html>`_ (Python 3.7+).

testing/test_assertion.py

@@ -585,6 +585,7 @@ class TestAssert_reprcompare_dataclass(object):
         assert "Omitting" not in lines[1]
         assert lines[2] == "['field_a']"
 
+    @pytest.mark.skipif(sys.version_info < (3, 7), reason="Dataclasses in Python3.7+")
     def test_dataclasses_with_attribute_comparison_off(self):
         from dataclasses import dataclass, field
 
@@ -603,6 +604,7 @@ class TestAssert_reprcompare_dataclass(object):
         for line in lines[2:]:
             assert "field_b" not in line
 
+    @pytest.mark.skipif(sys.version_info < (3, 7), reason="Dataclasses in Python3.7+")
     def test_comparing_different_data_classes(self):
         from dataclasses import dataclass