anchor.diff:          output.contains('-- iOS ${osMajorVersion}.${osMinorVersion} --');
   
       if (!versionCheck) {
  +      print(output);
         throw Exception(
             'Requested simulator version iOS ${osMajorVersion}.${osMinorVersion} '
             'is not available.');
  
positive.code: 
      final int indexOfPhone = listOfPhones.indexOf(phone);
      if (indexOfPhone == -1) {
        throw Exception('Simulator of $phone is not available for iOS version '
            '${osMajorVersion}.${osMinorVersion}');
      }
  
negative.code: 
      final String output = runtimeListResult.stdout as String;
      if (!output.contains(runtime)) {
        print(output);
        throw Exception('Mac does not have the requested $runtime '
            'available for simulators. Please use Xcode to install.');
      }
  
      // Check if the device is available.
  