[Findit] Add a sub-pipeline to analyze failures caused by DEPS rolls.

appengine/findit/common/test/dependency_test.py

 # Copyright 2014 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 unittest
 
 from common.dependency import Dependency
+from common.dependency import DependencyRoll
 
 
 class DependencyTest(unittest.TestCase):
   def testParentChild(self):
     parent = Dependency(
         'a/', 'https://cr.googlesource.com/cr/a.git', '12a', 'DEPS')
     child = Dependency(
         'a/b/', 'https://cr.googlesource.com/cr/b.git', '12b', 'DEPS')
 
     child.SetParent(parent)
     self.assertTrue(child.parent == parent)
     self.assertIn(child.path, parent.children)
     self.assertTrue(child == parent.children[child.path])
 
   def testToDict(self):
     root_dep = Dependency(
         'a/', 'https://cr.googlesource.com/cr/a.git', '12a', 'DEPS')
     sub_dep = Dependency(
         'a/b/', 'https://cr.googlesource.com/cr/b.git', '12b', 'DEPS')
-    expected_dep_tree_json = {
+    expected_dep_tree_dict = {
         'path': 'a/',
         'repo_url': 'https://cr.googlesource.com/cr/a.git',
         'revision': '12a',
         'deps_file': 'DEPS',
         'children': {
             'a/b/': {
               'path': 'a/b/',
               'repo_url': 'https://cr.googlesource.com/cr/b.git',
               'revision': '12b',
               'deps_file': 'DEPS',
               'children': {
               }
             }
         }
     }
 
     sub_dep.SetParent(root_dep)
-    self.assertEqual(expected_dep_tree_json, root_dep.ToDict())
+    self.assertEqual(expected_dep_tree_dict, root_dep.ToDict())
+
+
+class DependencyRollTest(unittest.TestCase):
+  def testToDict(self):
+    dep_roll = DependencyRoll(
+        'third_party/dep/', 'https://cr.googlesource.com/cr/dep.git',
+        'rev1', 'rev2')
+    expected_dep_roll_dict = {
+        'path': 'third_party/dep/',
+        'repo_url': 'https://cr.googlesource.com/cr/dep.git',
+        'old_revision': 'rev1',
+        'new_revision': 'rev2',
+    }
+
+    self.assertEqual(expected_dep_roll_dict, dep_roll.ToDict())