Add support to change the status header for gatekeeper-ng.

app_test.py

 #!/usr/bin/env python
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import ast
 import datetime
 import hashlib
 import hmac
 import json
@@ skipping 510 matching lines @@
     _, html_content, _ = template.genMessageContent(self.build_data)
 
     with open(os.path.join(self.test_dir, 'expected.html')) as f:
       expected_html = ' '.join(f.read().splitlines())
 
     saw = str(BeautifulSoup(html_content)).split()
     expected = str(BeautifulSoup(expected_html)).split()
 
     self.assertEqual(saw, expected)
 
+  def test_html_format_status(self):
+    import gatekeeper_mailer
+    status_header = ('Perf alert for "%(steps)s" on "%(builder_name)s"')
+    template = gatekeeper_mailer.MailTemplate(self.build_data['waterfall_url'],
+                                              self.build_data['build_url'],
+                                              self.build_data['project_name'],
+                                              'test@chromium.org',
+                                              status_header=status_header)
+
+    _, html_content, _ = template.genMessageContent(self.build_data)
+
+    with open(os.path.join(self.test_dir, 'expected_status.html')) as f:
+      expected_html = ' '.join(f.read().splitlines())
+
+    saw = str(BeautifulSoup(html_content)).split()
+    expected = str(BeautifulSoup(expected_html)).split()
+
+    self.assertEqual(saw, expected)
+
   def test_hmac_validation(self):
     from mailer import Email
     message = self.input_json['message']
     url = 'http://invalid.chromium.org'
     secret = 'pajamas'
 
     test_json = self._hash_message(time.time(), message, url, secret)
     # pylint: disable=W0212
     self.assertTrue(Email._validate_message(test_json, url, secret))
 
@@ skipping 10 matching lines @@
     ]
 
     for test_json in tests:
       # pylint: disable=W0212
       self.assertFalse(Email._validate_message(test_json, url, secret))
 
     test_json = self._hash_message(time.time(), message, url, secret)
     test_json['message'] = test_json['message'] + 'hey'
     # pylint: disable=W0212
     self.assertFalse(Email._validate_message(test_json, url, secret))