needed to specify 'reason=' for xfail to work

pizzathief · pizzathief · commit d04ab5ca4f49 · 2016-01-21T12:09:06.000+11:00
diff --git a/lib/matplotlib/tests/test_backend_ps.py b/lib/matplotlib/tests/test_backend_ps.py
@@ -16,11 +16,11 @@
 
 needs_ghostscript = pytest.mark.xfail(
     matplotlib.checkdep_ghostscript()[0] is None,
-    "This test needs a ghostscript installation")
+    reason="This test needs a ghostscript installation")
 
 needs_tex = pytest.mark.xfail(
     not matplotlib.checkdep_tex(),
-    "This test needs a TeX installation")
+    reason="This test needs a TeX installation")
 
 
 def _test_savefig_to_stringio(format='ps', use_log=False):
