[Findit] Add skeleton code for delta test script.

appengine/findit/crash/test/findit_for_chromecrash_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 chromium_deps
 from common.dependency import DependencyRoll
 from crash import detect_regression_range
 from crash import findit_for_chromecrash
 from crash import chromecrash_parser
 from crash import findit_for_crash
@@ skipping 106 matching lines @@
     expected_tag = {
           'found_suspects': False,
           'found_project': False,
           'found_components': False,
           'has_regression_range': False,
           'solution': 'core_algorithm',
     }
 
     self.assertEqual(expected_results, results)
     self.assertEqual(expected_tag, tag)
+
+  def testFieldsProperty(self):
+    culprit = findit_for_chromecrash.Culprit('proj', ['Blink>API'], [],
+                                             ['50.0.1234.0', '50.0.1234.1'])
+    self.assertEqual(culprit.fields,
+                     ('project', 'components', 'cls', 'regression_range'))