[Predator] Switch from scorer-based classifier to loglinear classifier.

appengine/findit/crash/test/occurrence_test.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.
 
 from common import constants
 from common.pipeline_wrapper import pipeline_handlers
 from crash.occurrence import Occurrence
 from crash.occurrence import DefaultOccurrenceRanking
 from crash.occurrence import RankByOccurrence
 from crash.stacktrace import StackFrame
 from crash.stacktrace import CallStack
 from crash.suspect import Suspect
 from crash.test.predator_testcase import PredatorTestCase
 
 
 class DummyClassifier(object):
 
   def GetClassFromStackFrame(self, frame):
     if frame.dep_path == 'src/':
       return 'class_1'
 
+    if frame.dep_path == 'dummy/':
+      return None
+
     return 'class_2'
 
   def GetClassFromSuspect(self, _result):  # pragma: no cover.
     return 'class_3'
 
   def Classify(self, results, crash_stack):
     top_n_frames = 4
     if results:
       classes = map(self.GetClassFromSuspect, results[:top_n_frames])
     else:
@@ skipping 17 matching lines @@
 
   def testClassifyCrashStack(self):
     dummy_classifier = DummyClassifier()
 
     crash_stack = CallStack(0)
     self.assertEqual(dummy_classifier.Classify([], crash_stack), '')
 
     crash_stack = CallStack(0, frame_list=[
         StackFrame(0, 'src/', 'a::c(p* &d)', 'f0.cc', 'src/f0.cc', [177]),
         StackFrame(1, 'src/', 'a::d(a* c)', 'f1.cc', 'src/f1.cc', [227]),
-        StackFrame(2, 'src/dummy', 'a::e(int)', 'f2.cc', 'src/f2.cc', [87])])
+        StackFrame(2, 'src/dummy', 'a::e(int)', 'f2.cc', 'src/f2.cc', [87]),
+        StackFrame(3, 'dummy/', 'a::g(int)', 'f3.cc', 'src/f3.cc', [87])])
 
     self.assertEqual(dummy_classifier.Classify([], crash_stack), 'class_1')
 
     crash_stack = CallStack(0, frame_list=[
         StackFrame(0, 'src/', 'a::c(p* &d)', 'f0.cc', 'src/f0.cc', [177]),
         StackFrame(1, 'src/dummy', 'a::d(a* c)', 'f1.cc', 'src/f1.cc', [227]),
         StackFrame(2, 'src/dummy', 'a::e(int)', 'f2.cc', 'src/f2.cc', [87])])
 
     self.assertEqual(dummy_classifier.Classify([], crash_stack), 'class_2')
 
   def testClassifySuspects(self):
     dummy_classifier = DummyClassifier()
 
     suspect = Suspect(self.GetDummyChangeLog(), 'src/')
     suspect.file_to_stack_infos = {
         'f0.cc': [(StackFrame(
             0, 'src/', 'a::c(p* &d)', 'f0.cc', 'src/f0.cc', [177]), 0)]
     }
 
     self.assertEqual(dummy_classifier.Classify([suspect], CallStack(0)),
                      'class_3')