Compare text with equality, not "is" identity.

tests/comparators/test_utils.py

@@ -59,7 +59,7 @@ def test_skip_unless_tools_exist_missing():
 
 def skip_unless_tool_is_at_least():
     func = skip_unless_tool_is_at_least
-    assert func("/missing", 1, 1).name is "skip"
+    assert func("/missing", 1, 1).name == "skip"
     # pytest.skipif().args[0] contains the evaluated statement
     assert func("cat", 1, 1).args[0] is False
     assert func("cat", 1, "1.2d.45+b8").args[0] is True