Add LogDog / annotation protobuf support.

recipe_engine/third_party/client-py/libs/logdog/tests/streamname_test.py

 #!/usr/bin/env python
 # Copyright 2016 The LUCI Authors. All rights reserved.
 # Use of this source code is governed under the Apache License, Version 2.0
 # that can be found in the LICENSE file.
 
 import os
 import sys
 import unittest
 import StringIO
 
@@ skipping 25 matching lines @@
         'foo/bar',
         'f123/four/five-_.:',
     ):
       raised = False
       try:
         streamname.validate_stream_name(name)
       except ValueError:
         raised = True
       self.assertFalse(raised, "Stream name '%s' raised ValueError" % (name,))
 
+  def testNormalize(self):
+    for name, normalized in (
+        ('', 'PFX'),
+        ('_invalid_start_char', 'PFX_invalid_start_char'),
+        ('valid_stream_name.1:2-3', 'valid_stream_name.1:2-3'),
+        ('some stream (with stuff)', 'some_stream__with_stuff_'),
+        ('_invalid/st!ream/name entry', 'PFX_invalid/st_ream/name_entry'),
+        ('     ', 'PFX_____'),
+    ):
+      self.assertEqual(streamname.normalize(name, prefix='PFX'), normalized)
+
+    # Assert that an empty stream name with no prefix will raise a ValueError.
+    self.assertRaises(ValueError, streamname.normalize, '')
+
+    # Assert that a stream name with an invalid starting character and no prefix
+    # will raise a ValueError.
+    self.assertRaises(ValueError, streamname.normalize, '_invalid_start_char')
+
 
 if __name__ == '__main__':
   unittest.main()