When fetching try jobs for a CL, include only the latest for each builder.

third_party/WebKit/Tools/Scripts/webkitpy/common/net/rietveld_unittest.py

 # Copyright 2016 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 json
 import logging
 import unittest
 import urllib2
 
-from webkitpy.common.net.rietveld import latest_try_jobs, TryJob, get_latest_try_job_results
+from webkitpy.common.net.rietveld import filter_latest_jobs
+from webkitpy.common.net.rietveld import get_latest_try_job_results
+from webkitpy.common.net.rietveld import latest_try_jobs
+from webkitpy.common.net.rietveld import TryJob
 from webkitpy.common.net.web_mock import MockWeb
 from webkitpy.common.system.outputcapture import OutputCapture
 
 
 _log = logging.getLogger(__name__)
 
 
 class RietveldTest(unittest.TestCase):
 
     def setUp(self):
@@ skipping 61 matching lines @@
     def test_latest_try_jobs_with_patchset(self):
         self.assertEqual(
             latest_try_jobs(11112222, ('bar-builder', 'other-builder'), self.web, patchset_number=2),
             [TryJob('bar-builder', 50)])
 
     def test_latest_try_jobs_no_relevant_builders(self):
         self.assertEqual(latest_try_jobs(11112222, ('foo', 'bar'), self.web), [])
 
     def test_get_latest_try_job_results(self):
         self.assertEqual(get_latest_try_job_results(11112222, self.web), {'foo-builder': 1, 'bar-builder': 0})
+
+    def test_filter_latest_jobs_empty(self):
+        self.assertEqual(filter_latest_jobs([]), [])
+
+    def test_filter_latest_jobs_higher_build_first(self):
+        self.assertEqual(
+            filter_latest_jobs([
+                TryJob('foo', 5),
+                TryJob('foo', 3),
+                TryJob('bar', 5),
+            ]),
+            [
+                TryJob('foo', 5),
+                TryJob('bar', 5),
+            ])
+
+    def test_filter_latest_jobs_higher_build_last(self):
+        self.assertEqual(
+            filter_latest_jobs([
+                TryJob('foo', 3),
+                TryJob('bar', 5),
+                TryJob('foo', 5),
+            ]),
+            [
+                TryJob('bar', 5),
+                TryJob('foo', 5),
+            ])