[Predator] Add TouchCrashedDirectory feature.

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

Index: appengine/findit/crash/loglinear/changelist_features/test/touch_crashed_directory_test.py
diff --git a/appengine/findit/crash/loglinear/changelist_features/test/touch_crashed_directory_test.py b/appengine/findit/crash/loglinear/changelist_features/test/touch_crashed_directory_test.py
new file mode 100644
index 0000000000000000000000000000000000000000..0f2487a0bd3b3a2577c3a1ab45d87637ccb51b64
--- /dev/null
+++ b/appengine/findit/crash/loglinear/changelist_features/test/touch_crashed_directory_test.py
@@ -0,0 +1,90 @@
+# 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.crash_report import CrashReport
+from crash.loglinear.changelist_features.touch_crashed_directory import (
+    TouchCrashedDirectoryFeature)
+from crash.loglinear.changelist_features.min_distance import Distance
+from crash.loglinear.changelist_features.min_distance import MinDistanceFeature
+from crash.loglinear.feature import ChangedFile
+from crash.suspect import Suspect
+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,
+        },
+    ],
+    'commit_url': 'https://repo.test/+/1',
+    'code_review_url': 'https://codereview.chromium.org/3281',
+    'revision': '1',
+    'reverted_revision': None
+})
+
+
+class TouchCrashedDirectoryFeatureTest(PredatorTestCase):
+  """Tests ``TouchCrashedDirectoryFeature``."""
+
+  def setUp(self):
+    super(TouchCrashedDirectoryFeatureTest, self).setUp()
+    self._feature = TouchCrashedDirectoryFeature()
+
+  def testAreLogOneWhenThereIsMatchedDirectory(self):
+    """Test that feature values are log(0)s when there is no matched file."""
+    frame1 = StackFrame(0, 'src/', 'func', 'f.cc',
+                        'src/f.cc', [2, 3], 'h://repo')
+    stack = CallStack(0, frame_list=[frame1])
+    stack_trace = Stacktrace([stack], stack)
+    deps = {'src/': Dependency('src/', 'h://repo', '8')}
+    dep_rolls = {'src/': DependencyRoll('src/', 'h://repo', '2', '6')}
+    report = CrashReport('8', 'sig', 'linux', stack_trace,
+                         ('2', '6'), deps, dep_rolls)
+    suspect = Suspect(_DUMMY_CHANGELOG, 'src/')
+    feature_value = self._feature(report)(suspect)
+    self.assertEqual(lmath.LOG_ONE, feature_value.value)
+
+  def testMinDistanceFeatureIsLogZeroWhenNoMatchedDirectory(self):
+    """Test that the feature returns log(1) when the min_distance is 0."""
+    frame = StackFrame(0, 'src/', 'func', 'dir/f.cc',
+                        'src/dir/f.cc', [2, 3], 'h://repo')
+    stack = CallStack(0, frame_list=[frame])
+    stack_trace = Stacktrace([stack], stack)
+    deps = {'src/': Dependency('src/', 'h://repo', '8')}
+    dep_rolls = {'src/': DependencyRoll('src/', 'h://repo', '2', '6')}
+    report = CrashReport('8', 'sig', 'linux', stack_trace,
+                         ('2', '6'), deps, dep_rolls)
+    suspect = Suspect(_DUMMY_CHANGELOG, 'src/')
+    feature_value = self._feature(report)(suspect)
+    self.assertEqual(lmath.LOG_ZERO, feature_value.value)