diff --git a/tests/test_languages.py b/tests/test_languages.py
index 211bd7c..e7a1cc9 100644
--- a/tests/test_languages.py
+++ b/tests/test_languages.py
@@ -6,6 +6,8 @@ from wakatime.packages import requests
 
 import time
 from wakatime.compat import u
+from wakatime.exceptions import NotYetImplemented
+from wakatime.languages import TokenParser
 from wakatime.packages.requests.models import Response
 from . import utils
 
@@ -20,6 +22,16 @@ class LanguagesTestCase(utils.TestCase):
         ['wakatime.session_cache.SessionCache.get', requests.session],
     ]
 
+    def test_token_parser(self):
+        with utils.mock.patch('wakatime.languages.TokenParser._extract_tokens') as mock_extract_tokens:
+
+            with self.assertRaises(NotYetImplemented):
+                source_file = 'tests/samples/codefiles/see.h'
+                parser = TokenParser(source_file)
+                parser.parse()
+
+            mock_extract_tokens.assert_called_once_with()
+
     def test_language_detected_for_header_file(self):
         response = Response()
         response.status_code = 500
diff --git a/wakatime/exceptions.py b/wakatime/exceptions.py
new file mode 100644
index 0000000..e99ba90
--- /dev/null
+++ b/wakatime/exceptions.py
@@ -0,0 +1,14 @@
+# -*- coding: utf-8 -*-
+"""
+    wakatime.exceptions
+    ~~~~~~~~~~~~~~~~~~~
+
+    Custom exceptions.
+
+    :copyright: (c) 2015 Alan Hamlett.
+    :license: BSD, see LICENSE for more details.
+"""
+
+
+class NotYetImplemented(Exception):
+    """This method needs to be implemented."""
diff --git a/wakatime/languages/__init__.py b/wakatime/languages/__init__.py
index 130d947..5cbe9f5 100644
--- a/wakatime/languages/__init__.py
+++ b/wakatime/languages/__init__.py
@@ -15,6 +15,7 @@ import sys
 import traceback
 
 from ..compat import u, open, import_module
+from ..exceptions import NotYetImplemented
 
 
 log = logging.getLogger('WakaTime')
@@ -39,7 +40,7 @@ class TokenParser(object):
         """
         if not tokens and not self.tokens:
             self.tokens = self._extract_tokens()
-        raise Exception('Not yet implemented.')
+        raise NotYetImplemented()
 
     def append(self, dep, truncate=False, separator=None, truncate_to=None,
                strip_whitespace=True):