Fix gn_helpers' parsing of bools.

build/gn_helpers_unittest.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 gn_helpers
 import unittest
 
 class UnitTest(unittest.TestCase):
   def test_ToGNString(self):
     self.assertEqual(
         gn_helpers.ToGNString([1, 'two', [ '"thr$\\', True, False, [] ]]),
         '[ 1, "two", [ "\\"thr\\$\\\\", true, false, [  ] ] ]')
 
   def test_UnescapeGNString(self):
     # Backslash followed by a \, $, or " means the folling character without
     # the special meaning. Backslash followed by everything else is a literal.
     self.assertEqual(
         gn_helpers.UnescapeGNString('\\as\\$\\\\asd\\"'),
         '\\as$\\asd"')
 
   def test_FromGNString(self):
     self.assertEqual(
         gn_helpers.FromGNString('[1, -20, true, false,["as\\"", []]]'),
         [ 1, -20, True, False, [ 'as"', [] ] ])
 
     with self.assertRaises(gn_helpers.GNException):
       parser = gn_helpers.GNValueParser('123 456')
       parser.Parse()
 
+  def test_ParseBool(self):
+    parser = gn_helpers.GNValueParser('true')
+    self.assertEqual(parser.Parse(), True)
+
+    parser = gn_helpers.GNValueParser('false')
+    self.assertEqual(parser.Parse(), False)
+
   def test_ParseNumber(self):
     parser = gn_helpers.GNValueParser('123')
     self.assertEqual(parser.ParseNumber(), 123)
 
     with self.assertRaises(gn_helpers.GNException):
       parser = gn_helpers.GNValueParser('')
       parser.ParseNumber()
     with self.assertRaises(gn_helpers.GNException):
       parser = gn_helpers.GNValueParser('a123')
       parser.ParseNumber()
@@ skipping 24 matching lines @@
       parser.ParseList()
     with self.assertRaises(gn_helpers.GNException):
       parser = gn_helpers.GNValueParser('[1, 2')  # Unterminated
       parser.ParseList()
     with self.assertRaises(gn_helpers.GNException):
       parser = gn_helpers.GNValueParser('[1 2]')  # No separating comma.
       parser.ParseList()
 
 if __name__ == '__main__':
   unittest.main()