Index: pip-19.1.1+git.1557777841.63878672/tests/unit/test_wheel.py
===================================================================
--- pip-19.1.1+git.1557777841.63878672.orig/tests/unit/test_wheel.py
+++ pip-19.1.1+git.1557777841.63878672/tests/unit/test_wheel.py
@@ -378,7 +378,7 @@ def test_check_compatibility():
     # test raises with correct error
     with pytest.raises(UnsupportedWheel) as e:
         wheel.check_compatibility(higher_v, name)
-    assert 'is not compatible' in str(e)
+    assert 'is not compatible' in str(e.value)
 
     # Should only log.warning - minor version is greater
     higher_v = (vc[0], vc[1] + 1)