Add presubmit check and automatic update script for ExtensionPermission enum.

tools/strict_enum_value_checker/strict_enum_value_checker_test.py

 #!/usr/bin/env python
 # Copyright 2014 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 difflib
 import os
 import re
 import unittest
 
-import PRESUBMIT
+from strict_enum_value_checker import StrictEnumValueChecker
 
 class MockLogging(object):
   def __init__(self):
     self.lines = []
 
   def info(self, message):
     self.lines.append(message)
 
   def debug(self, message):
     self.lines.append(message)
@@ skipping 46 matching lines @@
   def NewContents(self):
     return self._new_contents
 
   def LocalPath(self):
     return self._local_path
 
   def IsDirectory(self):
     return False
 
   def GenerateScmDiff(self):
-    result = ""
+    result = ''
     for line in difflib.unified_diff(self._old_contents, self._new_contents,
                                      self._local_path, self._local_path):
       result += line
     return result
 
   # NOTE: This method is a copy of ChangeContents method of AffectedFile in
   # presubmit_support.py
   def ChangedContents(self):
-    """Returns a list of tuples (line number, line text) of all new lines.
+    '''Returns a list of tuples (line number, line text) of all new lines.
 
      This relies on the scm diff output describing each changed code section
      with a line of the form
 
      ^@@ <old line num>,<old size> <new line num>,<new size> @@$
-    """
+    '''
     if self._cached_changed_contents is not None:
       return self._cached_changed_contents[:]
     self._cached_changed_contents = []
     line_num = 0
 
     if self.IsDirectory():
       return []
 
     for line in self.GenerateScmDiff().splitlines():
       m = re.match(r'^@@ [0-9\,\+\-]+ \+([0-9]+)\,[0-9]+ @@', line)
       if m:
         line_num = int(m.groups(1)[0])
         continue
       if line.startswith('+') and not line.startswith('++'):
         self._cached_changed_contents.append((line_num, line[1:]))
       if not line.startswith('-'):
         line_num += 1
     return self._cached_changed_contents[:]
 
 
 class MockChange(object):
   def __init__(self, changed_files):
     self._changed_files = changed_files
 
   def LocalPaths(self):
     return self._changed_files
 
 
-class HistogramValueCheckerTest(unittest.TestCase):
-  TEST_FILE_PATTERN = "PRESUBMIT_test_new_file_%s.txt"
+class StrictEnumValueCheckerTest(unittest.TestCase):
+  TEST_FILE_PATTERN = 'changed_file_%s.h'
+  MOCK_FILE_LOCAL_PATH = 'mock_enum.h'
+  START_MARKER = 'enum MockEnum {'
+  END_MARKER = '  mBoundary'
 
   def _ReadTextFileContents(self, path):
-    """Given a path, returns a list of strings corresponding to the text lines
+    '''Given a path, returns a list of strings corresponding to the text lines
     in the file. Reads files in text format.
 
-    """
+    '''
     fo = open(path, 'r')
     try:
       contents = fo.readlines()
     finally:
       fo.close()
     return contents
 
   def _ReadInputFile(self):
-    return self._ReadTextFileContents("PRESUBMIT_test_old_file.txt")
+    return self._ReadTextFileContents('mock_enum.h')
 
   def _PrepareTest(self, new_file_path):
     old_contents = self._ReadInputFile()
     if not new_file_path:
       new_contents = []
     else:
       new_contents = self._ReadTextFileContents(new_file_path)
     input_api = MockInputApi()
-    mock_file = MockFile(PRESUBMIT.HistogramValueChecker.LOCAL_PATH,
+    mock_file = MockFile(self.MOCK_FILE_LOCAL_PATH,
                          old_contents,
                          new_contents)
     input_api.files.append(mock_file)
     output_api = MockOutputApi()
     return input_api, output_api
 
   def _RunTest(self, new_file_path):
     input_api, output_api = self._PrepareTest(new_file_path)
-    checker = PRESUBMIT.HistogramValueChecker(input_api, output_api)
+    checker = StrictEnumValueChecker(input_api, output_api, self.START_MARKER,
+                                     self.END_MARKER, self.MOCK_FILE_LOCAL_PATH)
     results = checker.Run()
     return results
 
   def testDeleteFile(self):
     results = self._RunTest(new_file_path=None)
     # TODO(rpaquay) How to check it's the expected warning?'
     self.assertEquals(1, len(results),
-                      "We hould get a single warning about file deletion.")
+                      'We should get a single warning about file deletion.')
 
   def testSimpleValidEdit(self):
-    results = self._RunTest(self.TEST_FILE_PATTERN % "1")
+    results = self._RunTest(self.TEST_FILE_PATTERN % '1')
     # TODO(rpaquay) How to check it's the expected warning?'
     self.assertEquals(0, len(results),
-                      "We should get no warning for simple edits.")
+                      'We should get no warning for simple edits.')
 
   def testSingleDeletionOfEntry(self):
-    results = self._RunTest(self.TEST_FILE_PATTERN % "2")
+    results = self._RunTest(self.TEST_FILE_PATTERN % '2')
     # TODO(rpaquay) How to check it's the expected warning?'
     self.assertEquals(1, len(results),
-                      "We should get a warning for an entry deletion.")
+                      'We should get a warning for an entry deletion.')
 
   def testSingleRenameOfEntry(self):
-    results = self._RunTest(self.TEST_FILE_PATTERN % "3")
+    results = self._RunTest(self.TEST_FILE_PATTERN % '3')
     # TODO(rpaquay) How to check it's the expected warning?'
     self.assertEquals(1, len(results),
-                      "We should get a warning for an entry rename, even "
-                      "though it is not optimal.")
+                      'We should get a warning for an entry rename, even '
+                      'though it is not optimal.')
 
   def testMissingEnumStartOfEntry(self):
-    results = self._RunTest(self.TEST_FILE_PATTERN % "4")
+    results = self._RunTest(self.TEST_FILE_PATTERN % '4')
     # TODO(rpaquay) How to check it's the expected warning?'
     self.assertEquals(1, len(results),
-                      "We should get a warning for a missing enum marker.")
+                      'We should get a warning for a missing enum marker.')
 
   def testMissingEnumEndOfEntry(self):
-    results = self._RunTest(self.TEST_FILE_PATTERN % "5")
+    results = self._RunTest(self.TEST_FILE_PATTERN % '5')
     # TODO(rpaquay) How to check it's the expected warning?'
     self.assertEquals(1, len(results),
-                      "We should get a warning for a missing enum marker.")
+                      'We should get a warning for a missing enum marker.')
 
   def testInvertedEnumMarkersOfEntry(self):
-    results = self._RunTest(self.TEST_FILE_PATTERN % "6")
+    results = self._RunTest(self.TEST_FILE_PATTERN % '6')
     # TODO(rpaquay) How to check it's the expected warning?'
     self.assertEquals(1, len(results),
-                      "We should get a warning for inverted enum markers.")
+                      'We should get a warning for inverted enum markers.')
 
   def testMultipleInvalidEdits(self):
-    results = self._RunTest(self.TEST_FILE_PATTERN % "7")
+    results = self._RunTest(self.TEST_FILE_PATTERN % '7')
     # TODO(rpaquay) How to check it's the expected warning?'
     self.assertEquals(3, len(results),
-                      "We should get 3 warnings (one per edit).")
+                      'We should get 3 warnings (one per edit).')
 
   def testSingleInvalidInserts(self):
-    results = self._RunTest(self.TEST_FILE_PATTERN % "8")
+    results = self._RunTest(self.TEST_FILE_PATTERN % '8')
     # TODO(rpaquay) How to check it's the expected warning?'
     self.assertEquals(1, len(results),
-                      "We should get a warning for a single invalid "
-                      "insertion inside the enum.")
+                      'We should get a warning for a single invalid '
+                      'insertion inside the enum.')
 
   def testMulitpleValidInserts(self):
-    results = self._RunTest(self.TEST_FILE_PATTERN % "9")
+    results = self._RunTest(self.TEST_FILE_PATTERN % '9')
     # TODO(rpaquay) How to check it's the expected warning?'
     self.assertEquals(0, len(results),
-                      "We should not get a warning mulitple valid edits")
+                      'We should not get a warning mulitple valid edits')
 
   def testSingleValidDeleteOutsideOfEnum(self):
-    results = self._RunTest(self.TEST_FILE_PATTERN % "10")
+    results = self._RunTest(self.TEST_FILE_PATTERN % '10')
     # TODO(rpaquay) How to check it's the expected warning?'
     self.assertEquals(0, len(results),
-                      "We should not get a warning for a deletion outside of "
-                      "the enum")
+                      'We should not get a warning for a deletion outside of '
+                      'the enum')
 
-  def testCommentIsNotEnumEndMarker(self):
-    results = self._RunTest(self.TEST_FILE_PATTERN % "11")
-    self.assertEquals(1, len(results),
-                      "We should get a warning if '// Last Entry' is not the "
-                      "enum end marker")
 
 if __name__ == '__main__':
   unittest.main()