Use a better xfail reason

Author: hackebrot

testing/test_skipping.py

@@ -145,15 +145,15 @@ def test_func():
     def test_xfail_xpassed(self, testdir):
         item = testdir.getitem("""
             import pytest
-            @pytest.mark.xfail(reason="nope")
+            @pytest.mark.xfail(reason="this is an xfail")
             def test_func():
                 assert 1
         """)
         reports = runtestprotocol(item, log=False)
         assert len(reports) == 3
         callreport = reports[1]
         assert callreport.passed
-        assert callreport.wasxfail == "nope"
+        assert callreport.wasxfail == "this is an xfail"
 
     def test_xfail_xpassed_strict(self, testdir):
         item = testdir.getitem("""