public VideoRecordingFailsWithoutCamera(
     VideoRecording aVideoRecording,
     VideoCamera aCamera,
     Microphone aMicrophone)
 {
     videoRecording = aVideoRecording;
     camera = aCamera;
     microphone = aMicrophone;
 }
 public VideoRecordingSucceedsWithCameraAndMicrophone(
     VideoRecording aVideoRecording,
     VideoCamera aCamera,
     Microphone aMicrophone)
 {
     videoRecording = aVideoRecording;
     camera = aCamera;
     microphone = aMicrophone;
 }