text: #!/usr/bin/env python
  # 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.
  
  """Runs Dart example tests"""
  
  # This script runs tests of example Dart Mojo apps.
  # It looks for files named *_test.dart under subdirectories of
  # //examples/dart in the EXAMPLES list, below. These tests are
  # passed a command line argument --mojo-shell /path/to/mojo_shell that they
  # can use to run the example.
  
  import argparse
  import os
  import subprocess
  import sys
  
  SCRIPT_DIR = os.path.dirname(os.path.abspath(__file__))
  SRC_DIR = os.path.dirname(os.path.dirname(SCRIPT_DIR))
  
  DART_SDK = os.path.join(SRC_DIR, 'third_party', 'dart-sdk', 'dart-sdk', 'bin')
  DART = os.path.join(DART_SDK, 'dart')
  
  # Add subdirectories of //examples/dart here.
  EXAMPLES = ['hello_world', 'wget']
  
  def FindTests(example):
    tests = []
    for root, _, files in os.walk(os.path.join(SCRIPT_DIR, example)):
      for f in files:
        if f.endswith('_test.dart'):
          tests.append(os.path.join(root, f))
    return tests
  
  def RunTests(tests, build_dir, package_root):
    for test in tests:
      test_path = os.path.join(SCRIPT_DIR, test)
      subprocess.check_call(
          [DART, '-p', package_root, '--checked', test_path,
           '--mojo-shell', os.path.join(build_dir, 'mojo_shell'),])
  
  def main(build_dir, package_root):
    for example in EXAMPLES:
      tests = FindTests(example)
      RunTests(tests, build_dir, package_root)
  
  if __name__ == '__main__':
    parser = argparse.ArgumentParser(description="Run Dart example tests")
    parser.add_argument('-b', '--build-dir',
                        dest='build_dir',
                        metavar='<build-directory>',
                        type=str,
                        required=True,
                        help='The build output directory. E.g. out/Debug')
    args = parser.parse_args()
    package_root = os.path.join(
        SRC_DIR, args.build_dir, 'gen', 'dart-pkg', 'packages')
    sys.exit(main(args.build_dir, package_root))
  