[Findit] Initial code of findit for crash. Add scorers to apply heuristic rules.

appengine/findit/crash/scorers/test/top_frame_index_test.py

Index: appengine/findit/crash/scorers/test/top_frame_index_test.py
diff --git a/appengine/findit/crash/scorers/test/top_frame_index_test.py b/appengine/findit/crash/scorers/test/top_frame_index_test.py
new file mode 100644
index 0000000000000000000000000000000000000000..b87557951eb02b19ee8c92b2de45125f95cbfa52
--- /dev/null
+++ b/appengine/findit/crash/scorers/test/top_frame_index_test.py
@@ -0,0 +1,30 @@
+# 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.
+
+from crash.callstack import StackFrame
+from crash.results import MatchResult
+from crash.scorers.test.scorer_test_suite import ScorerTestSuite
+from crash.scorers.top_frame_index import TopFrameIndex
+
+
+class TopFrameIndexTest(ScorerTestSuite):
+
+  def testGetMetric(self):
+    result = MatchResult(self._GetDummyChangeLog(), 'src/', '')
+    self.assertEqual(TopFrameIndex().GetMetric(result), None)
+
+    result.file_to_stack_infos = {
+        'a.cc': [(StackFrame(0, 'src/', '', 'func', 'a.cc', [7]), 0)]
+    }
+    self.assertEqual(TopFrameIndex().GetMetric(result), 0)
+
+  def testScore(self):
+    self.assertEqual(TopFrameIndex().Score(0), 1)
+    self.assertEqual(TopFrameIndex().Score(30), 0)
+
+  def testReason(self):
+    self.assertEqual(TopFrameIndex().Reason(0, 1),
+                     'Top frame changed is frame #0')
+    self.assertEqual(TopFrameIndex().Reason(30, 0),
+                     '')