[Predator] Add TouchCrashedFileMetaFeature.

appengine/findit/crash/loglinear/changelist_features/test/touch_crashed_file_meta_test.py

Index: appengine/findit/crash/loglinear/changelist_features/test/touch_crashed_file_meta_test.py
diff --git a/appengine/findit/crash/loglinear/changelist_features/test/touch_crashed_file_meta_test.py b/appengine/findit/crash/loglinear/changelist_features/test/touch_crashed_file_meta_test.py
new file mode 100644
index 0000000000000000000000000000000000000000..25470f7a02c10bf9336556b6157d6f14783975d7
--- /dev/null
+++ b/appengine/findit/crash/loglinear/changelist_features/test/touch_crashed_file_meta_test.py
@@ -0,0 +1,118 @@
+# 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 unittest
+
+from common.chrome_dependency_fetcher import ChromeDependencyFetcher
+from common.dependency import Dependency
+from common.dependency import DependencyRoll
+from crash import changelist_classifier as scorer_changelist_classifier
+from crash.crash_report import CrashReport
+from crash.crash_report_with_dependencies import CrashReportWithDependencies
+from crash.loglinear.changelist_features.touch_crashed_file_meta import (
+    TouchCrashedFileMetaFeature)
+from crash.loglinear.changelist_features.min_distance import ModifiedFrameInfo
+from crash.loglinear.changelist_features.min_distance import MinDistanceFeature
+from crash.loglinear.feature import ChangedFile
+from crash.suspect import AnalysisInfo
+from crash.suspect import Suspect
+from crash.suspect import StackInfo
+from crash.stacktrace import CallStack
+from crash.stacktrace import StackFrame
+from crash.stacktrace import Stacktrace
+from crash.test.predator_testcase import PredatorTestCase
+from libs.gitiles.blame import Blame
+from libs.gitiles.blame import Region
+from libs.gitiles.change_log import ChangeLog
+from libs.gitiles.change_log import FileChangeInfo
+from libs.gitiles.diff import ChangeType
+from libs.gitiles.gitiles_repository import GitilesRepository
+import libs.math.logarithms as lmath
+
+
+_DUMMY_CHANGELOG = ChangeLog.FromDict({
+    'author': {
+        'name': 'r@chromium.org',
+        'email': 'r@chromium.org',
+        'time': 'Thu Mar 31 21:24:43 2016',
+    },
+    'committer': {
+        'name': 'example@chromium.org',
+        'email': 'r@chromium.org',
+        'time': 'Thu Mar 31 21:28:39 2016',
+    },
+    'message': 'dummy',
+    'commit_position': 175900,
+    'touched_files': [
+        {
+            'change_type': 'add',
+            'new_path': 'a.cc',
+            'old_path': None,
+        },
+        {
+            'change_type': 'add',
+            'new_path': 'f.cc',
+            'old_path': None,
+        },
+    ],
+    'commit_url': 'https://repo.test/+/1',
+    'code_review_url': 'https://codereview.chromium.org/3281',
+    'revision': '1',
+    'reverted_revision': None
+})
+
+
+class TouchCrashedFileMetaFeatureTest(PredatorTestCase):
+  """Tests ``TouchCrashedFileMetaFeature``."""
+
+  def _GetDummyReport(self):
+    crash_stack = CallStack(0, [StackFrame(0, 'src/', 'func', 'a.cc',
+                                           'a.cc', [2], 'https://repo')])
+    return CrashReport('rev', 'sig', 'win',
+                       Stacktrace([crash_stack], crash_stack),
+                       ('rev0', 'rev9'))
+
+  def _GetMockSuspect(self):
+    """Returns a ``Suspect`` with the desired min_distance."""
+    return Suspect(_DUMMY_CHANGELOG, 'src/')
+
+  def testAreLogZerosWhenNoMatchedFile(self):
+    """Test that feature values are log(0)s when there is no matched file."""
+    self.mock(ChromeDependencyFetcher, 'GetDependency',
+              lambda *_: {'src':
+                          Dependency('src/dep', 'https://repo', '6')})
+
+    get_repository = GitilesRepository.Factory(self.GetMockHttpClient())
+    report = CrashReportWithDependencies(
+        self._GetDummyReport(), ChromeDependencyFetcher(get_repository))
+    suspect = self._GetMockSuspect()
+
+    feature_values = TouchCrashedFileMetaFeature(
+        get_repository)(report)(suspect).values()
+    for feature_value in feature_values:
+        self.assertEqual(lmath.LOG_ZERO, feature_value.value)
+
+  def testMinDistanceFeatureIsLogOne(self):
+    """Test that the feature returns log(1) when the min_distance is 0."""
+    suspect = self._GetMockSuspect()
+
+    self.mock(ChromeDependencyFetcher, 'GetDependency',
+              lambda *_: {'src/': Dependency('src/', 'https://repo', '6')})
+    self.mock(ChromeDependencyFetcher, 'GetDependencyRollsDict',
+              lambda *_: {'src/': DependencyRoll('src/', 'https://repo',
+                                                 '0', '4')})
+
+    get_repository = GitilesRepository.Factory(self.GetMockHttpClient())
+    report = CrashReportWithDependencies(
+        self._GetDummyReport(), ChromeDependencyFetcher(get_repository))
+
+    frame = StackFrame(0, 'src/', 'func', 'a.cc', 'a.cc', [2], 'https://repo')
+    self.mock(MinDistanceFeature,
+              'DistanceBetweenTouchedFileAndStacktrace',
+              lambda *_: ModifiedFrameInfo(0, frame))
+
+    feature_values = TouchCrashedFileMetaFeature(
+        get_repository)(report)(suspect)
+
+    self.assertEqual(lmath.LOG_ONE, feature_values['MinDistance'].value)