[tests/config] Add tests for helptexts

Ensure that each theme is listed in the helptext and that there is a
helptext entry for every module.

bumblebee/config.py

@@ -4,6 +4,7 @@ This module provides configuration information (loaded modules,
 module parameters, etc.) to all other components
 """
 
+import sys
 import argparse
 import textwrap
 import importlib
@@ -26,7 +27,7 @@ class print_usage(argparse.Action):
             self.print_themes()
         else:
             parser.print_help()
-        parser.exit()
+        sys.exit(0)
 
     def print_themes(self):
         print(textwrap.fill(", ".join(bumblebee.theme.themes()),

tests/test_config.py

@@ -1,7 +1,15 @@
 # pylint: disable=C0103,C0111
+
 import unittest
+import mock
+try:
+    from StringIO import StringIO
+except ImportError:
+    from io import StringIO
 
 from bumblebee.config import Config
+from bumblebee.theme import themes
+from bumblebee.engine import all_modules
 
 class TestConfig(unittest.TestCase):
     def setUp(self):
@@ -25,4 +33,20 @@ class TestConfig(unittest.TestCase):
             "name": x.split(":")[1],
         } for x in self.someAliasModules])
 
+    @mock.patch("sys.stdout", new_callable=StringIO)
+    @mock.patch("sys.exit")
+    def test_list_themes(self, exit, stdout):
+        cfg = Config(["-l", "themes"])
+        result = stdout.getvalue()
+        for theme in themes():
+            self.assertTrue(theme in result)
+
+    @mock.patch("sys.stdout", new_callable=StringIO)
+    @mock.patch("sys.exit")
+    def test_list_modules(self, exit, stdout):
+        cfg = Config(["-l", "modules"])
+        result = stdout.getvalue()
+        for module in all_modules():
+            self.assertTrue(module["name"] in result)
+
 # vim: tabstop=8 expandtab shiftwidth=4 softtabstop=4