Merge pull request #1 from msabramo/patch-2

Make test_missing_argument expect error

Author: svisser

tests/functional/test_show.py

@@ -64,7 +64,7 @@ def test_missing_argument(script):
     """
     Test show command with no arguments.
     """
-    result = script.pip('show')
+    result = script.pip('show', expect_error=True)
     assert 'ERROR: Please provide a package name or names.' in result.stdout