Add a test for a deleted ref for the Github trigger

Fixes #1047

test/test_prepare_trigger.py

@@ -1,7 +1,7 @@
 import unittest
 import json
 
-from jsonschema import validate, ValidationError
+from jsonschema import validate
 from buildtrigger.customhandler import custom_trigger_payload
 from buildtrigger.basehandler import METADATA_SCHEMA
 from buildtrigger.bitbuckethandler import get_transformed_webhook_payload as bb_webhook
@@ -376,5 +376,29 @@ class TestPrepareTrigger(unittest.TestCase):
     self.assertSchema('gitlab_webhook', expected, gl_webhook, lookup_user=lookup_user)
 
 
+  def test_github_webhook_payload_deleted_commit(self):
+    expected = {
+      'commit': u'456806b662cb903a0febbaed8344f3ed42f27bab',
+      'commit_info': {
+        'author': {
+          'username': u'jakedt'
+        },
+        'committer': {
+          'username': u'jakedt'
+        },
+        'date': u'2015-12-08T18:07:03-05:00',
+        'message': (u'Merge pull request #1044 from jakedt/errerror\n\n' +
+                    'Assign the exception to a variable to log it'),
+        'url': u'https://github.com/coreos-inc/quay/commit/456806b662cb903a0febbaed8344f3ed42f27bab'
+      },
+      'git_url': u'git@github.com:coreos-inc/quay.git',
+      'ref': u'refs/heads/master',
+    }
+
+    def lookup_user(_):
+      return None
+
+    self.assertSchema('github_webhook_deletedcommit', expected, gh_webhook, lookup_user=lookup_user)
+
 if __name__ == '__main__':
-  unittest.main()
+  unittest.main()