[Predator] Move ``SingleFeatureScore`` to LLM.

appengine/findit/crash/loglinear/test/feature_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.
 
 import unittest
 
 from crash.loglinear import feature
+from crash.loglinear.test.loglinear_testcase import LoglinearTestCase
 import libs.math.logarithms as lmath
 
 _MAXIMUM = 50.
 
 
 class ChangelistFeatureTest(unittest.TestCase):
 
   def testLinearlyScaledIsZero(self):
     """Test that ``LinearlyScaled`` takes 0 to 1."""
     self.assertEqual(1., feature.LinearlyScaled(0., _MAXIMUM))
@@ skipping 13 matching lines @@
 
   def testLogLinearlyScaledMiddling(self):
     """Test that ``LogLinearlyScaled`` works on middling values."""
     self.assertEqual(
         lmath.log((_MAXIMUM - 42.) / _MAXIMUM),
         feature.LogLinearlyScaled(42., _MAXIMUM))
 
   def testLogLinearlyScaledIsOverMax(self):
     """Test that ``LogLinearlyScaled`` takes values over the max to log(0)."""
     self.assertEqual(lmath.LOG_ZERO, feature.LogLinearlyScaled(42., 10.))
+
+
+class FeatureFunctionTest(LoglinearTestCase):
+
+  def testFeatureFunction(self):
+    """Test that ``FeatureFunction`` obeys the equality its docstring says."""
+    for x in self._X:
+      for y in self._Y(x):
+        for f in self._feature_list:
+          self.assertEqual(f(x)(y), self._feature_function(x)(y)[f.name])