anchor.diff:  
       // Adjust default timeout based on mode, compiler, and sometimes runtime.
       if (configuration['timeout'] == -1) {
  -      var isReload = configuration['hot_reload'] ||
  -                     configuration['hot_reload_rollback'];
  +      var isReload =
  +          configuration['hot_reload'] || configuration['hot_reload_rollback'];
         int compilerMulitiplier =
             new CompilerConfiguration(configuration).computeTimeoutMultiplier();
         int runtimeMultiplier = new RuntimeConfiguration(configuration)
  
positive.code:    dartkp: Compiler the Dart source into Kernel and then Kernel into AOT
     snapshot before running the test.''',
            ['-c', '--compiler'],
            ['none', 'precompiler', 'dart2js', 'dart2analyzer', 'dart2app',
             'dart2appjit', 'dartk', 'dartkp'],
            'none'),
        // TODO(antonm): fix the option drt.
        new _TestOptionSpecification(
  
negative.code:     if (selectors.containsKey('observatory_ui')) {
        if (selectors.length == 1) {
          configuration['packages'] = TestUtils.dartDirUri
              .resolve('runtime/observatory/.packages')
              .toFilePath();
        } else {
          // Make a new configuration whose selectors map only contains
          // observatory_ui, and remove the key from the original selectors.
          // The only mutable value in the map is the selectors, so a
          // shallow copy is safe.
          var observatoryConfiguration = new Map.from(configuration);
          observatoryConfiguration['selectors'] = {
            'observatory_ui': selectors['observatory_ui']
          };
          selectors.remove('observatory_ui');
  
          // Set the packages flag.
          observatoryConfiguration['packages'] = TestUtils.dartDirUri
              .resolve('runtime/observatory/.packages')
              .toFilePath();
  
          // Return the expansions of both configurations. Neither will reach
          // this line in the recursive call to _expandConfigurations.
  