[Findit] Enable project classifier and component classifier

appengine/findit/crash/test/classifier_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 import classifier
+from crash.callstack import CallStack
+from crash.callstack import StackFrame
+from crash.results import Result
+from crash.test.crash_testcase import CrashTestCase
+
+
+class DummyClassifier(classifier.Classifier):
+
+  def GetClassFromStackFrame(self, frame):
+    if frame.dep_path == 'src/':
+      return 'class_1'
+
+    return 'class_2'
+
+  def GetClassFromResult(self, result):  # pragma: no cover.
+    return 'class_3'
+
+  def Classify(self, results, crash_stack):
+    class_list = self._Classify(results, crash_stack, 4, 1)
+    if class_list:
+      return class_list[0]
+
+    return ''
+
+
+class ClassifierTest(CrashTestCase):
+
+  def testDefaultRankFunction(self):
+    self.assertEqual(classifier.DefaultRankFunction(
+        classifier.ClassOccurrenceInfo('c1', [0])),
+        (-1, 0))
+
+    self.assertEqual(classifier.DefaultRankFunction(
+        classifier.ClassOccurrenceInfo('c1', [0, 1])),
+        (-float('inf'), 0))
+
+  def testClassifyCrashStack(self):
+    dummy_classifier = DummyClassifier()
+
+    crash_stack = CallStack(0)
+    self.assertEqual(dummy_classifier.Classify([], crash_stack), '')
+
+    crash_stack.extend(
+        [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])])
+
+    self.assertEqual(dummy_classifier.Classify([], crash_stack), 'class_1')
+
+    crash_stack = CallStack(0)
+    crash_stack.extend(
+        [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 testClassifyResults(self):
+    dummy_classifier = DummyClassifier()
+
+    result = Result(self.GetDummyChangeLog(), 'src/')
+    result.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([result], CallStack(0)),
+                     'class_3')
+
+