[Findit] Capture and store latest buildbucket response with each query

appengine/findit/waterfall/test/monitor_try_job_pipeline_test.py

Index: appengine/findit/waterfall/test/monitor_try_job_pipeline_test.py
diff --git a/appengine/findit/waterfall/test/monitor_try_job_pipeline_test.py b/appengine/findit/waterfall/test/monitor_try_job_pipeline_test.py
index ddca402d90ea2d9a3e0961223c26aa61b4a99f07..e9711cc4af3fd7eb777d0e176d20cb0812ecd62d 100644
--- a/appengine/findit/waterfall/test/monitor_try_job_pipeline_test.py
+++ b/appengine/findit/waterfall/test/monitor_try_job_pipeline_test.py
@@ -133,6 +133,32 @@ class MonitorTryJobPipelineTest(wf_testcase.WaterfallTestCase):
         monitor_try_job_pipeline._MicrosecondsToDatetime(1454367574000000))
     self.assertIsNone(monitor_try_job_pipeline._MicrosecondsToDatetime(None))
 
+  def testDictsAreEqual(self):
+    self.assertTrue(monitor_try_job_pipeline._DictsAreEqual(None, None))
+    self.assertTrue(monitor_try_job_pipeline._DictsAreEqual({}, {}))
+    self.assertTrue(monitor_try_job_pipeline._DictsAreEqual({'a': 1}, {'a': 1}))
+    self.assertTrue(monitor_try_job_pipeline._DictsAreEqual(
+        {'a': 1},
+        {'a': 1, 'b': 2},
+        exclude_keys=['b']))
+    self.assertTrue(monitor_try_job_pipeline._DictsAreEqual(
+        {'a': 1, 'b': 1},
+        {'a': 1, 'b': 2},
+        exclude_keys=['b']))
+    self.assertTrue(monitor_try_job_pipeline._DictsAreEqual(
+        {'a': 1},
+        {},
+        exclude_keys=['a']))
+    self.assertFalse(monitor_try_job_pipeline._DictsAreEqual(
+        {'a': 1},
+        {'a': 2}))
+    self.assertFalse(monitor_try_job_pipeline._DictsAreEqual(
+        {'a': 1, 'b': 2},
+        {'a': 1}))
+    self.assertFalse(monitor_try_job_pipeline._DictsAreEqual(
+        {'a': 1},
+        {'a': 1, 'b': 2}))
+
   def testUpdateTryJobMetadataForBuildError(self):
     error_data = {
         'reason': 'BUILD_NOT_FOUND',