Fixed unit test error on combination of Python 2.7 and Windows

Author: tleonhardt

CHANGES.md

@@ -15,6 +15,7 @@ rerNews
     * Enhanced tab-completion of cmd2 command names to support case-insensitive completion
     * Added an example showing how to remove unused commands
     * Improved how transcript testing handles prompts with ANSI escape codes by stripping them
+    * Greatly improved implementation for how command output gets piped to a shell command
 
 0.7.5
 -----

tests/test_cmd2.py

@@ -589,7 +589,10 @@ def test_pipe_to_shell_error(base_app, capsys):
 
     expected_error = 'FileNotFoundError'
     if six.PY2:
-        expected_error = 'OSError'
+        if sys.platform.startswith('win'):
+            expected_error = 'WindowsError'
+        else:
+            expected_error = 'OSError'
     assert err.startswith("EXCEPTION of type '{}' occurred with message:".format(expected_error))