Rewrite isolate_smoke_test.py to increase the coverage.

tools/isolate/data/isolate/child.py

-#!/usr/bin/env python
-# Copyright (c) 2012 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 os
-import sys
-
-
-def main():
-  print 'child: verify the test data files were mapped properly'
-  files = sorted(os.listdir('files1'))
-  tree = {
-    'test_file1.txt': 'Foo\n',
-    'test_file2.txt': 'Bar\n',
-  }
-
-  # For now, ignore .svn directory, which happens to be there with --mode=trace
-  # from a svn checkout.  The file shouldn't be there when --mode=run is used.
-  # TODO(maruel): Differentiate between the two modes and detect .svn
-  # directories in --mode=run.
-  if '.svn' in files:
-    files.remove('.svn')
-
-  if files != sorted(tree):
-    print '%s != %s' % (files, sorted(tree))
-    return 2
-  for k, v in tree.iteritems():
-    content = open(os.path.join('files1', k), 'rb').read()
-    if v != content:
-      print '%s: %r != %r' % (k, v, content)
-      return 3
-
-  if sys.argv[1] == '--ok':
-    return 0
-  elif sys.argv[1] == '--fail':
-    return 1
-  return 4
-
-
-if __name__ == '__main__':
-  sys.exit(main())