public function test_handleBadAnswer()
 {
     $this->exerciseRepository->expects($this->once())->method('handleBadAnswer')->with($this->exercise->id, $this->user->id);
     $this->exercise->handleBadAnswer($this->user->id);
 }
 /**
  * @param Exercise $exercise
  */
 public function handleBadAnswer(Exercise $exercise)
 {
     $this->authorizeForUser($this->user(), 'learn', $exercise->lesson);
     $exercise->handleBadAnswer($this->user()->id);
 }