fix Wadsworth's Constant edge case and add test

modules/test/test_wadsworth.py

@@ -0,0 +1,21 @@
+"""
+test_nsfw.py - some things just aren't safe for work, the test cases
+author: mutantmonkey <mutantmonkey@mutantmonkey.in>
+"""
+
+import re
+import unittest
+from mock import MagicMock, Mock
+from modules.wadsworth import wadsworth
+
+
+class TestWadsworth(unittest.TestCase):
+    def setUp(self):
+        self.phenny = MagicMock()
+
+    def test_wadsworth(self):
+        input = Mock(group=lambda x: "Apply Wadsworth's Constant to a string")
+        wadsworth(self.phenny, input)
+
+        self.phenny.say.assert_called_once_with(
+                "Constant to a string")

modules/wadsworth.py

@@ -1,13 +1,16 @@
 #!/usr/bin/python3
 """
-wadsworth.py - Use Wadsworth's Constant on a string.
+wadsworth.py - Apply Wadsworth's Constant to some text.
 https://gist.github.com/1257195
 author: mutantmonkey <mutantmonkey@mutantmonkey.in>
 """
 
 def wadsworth(phenny, input):
-    """.wadsworth - Use Wadsworth's Constant on a string."""
+    """.wadsworth - Apply Wadsworth's Constant to some text."""
     text = input.group(2)
+    if not text:
+        return phenny.say(".wadsworth <text> - apply Wadsworth's Constant")
+
     text = text[text.find(' ', int(round(0.3 * len(text)))) + 1:]
     phenny.say(text)
 wadsworth.commands = ['wadsworth']