Cleaning the Database and Mocking the Controller

//...
public class QuestionControllerTest {
   private QuestionController controller;
   @Before
   public void create() {
      controller = new QuestionController();
      controller.deleteAll();
   }
   
   @After
   public void cleanup() {
      controller.deleteAll();
   }
   @Test
   public void findsPersistedQuestionById() {
      int id = controller.addBooleanQuestion("question text");
      
      Question question = controller.find(id);
      
      assertThat(question.getText(), equalTo("question text"));
   }
   
   @Test
   public void questionAnswersDateAdded() {
      Instant now = new Date().toInstant();
      controller.setClock(Clock.fixed(now, ZoneId.of("America/Denver")));
      int id = controller.addBooleanQuestion("text");
      
      Question question = controller.find(id);
      
      assertThat(question.getCreateTimestamp(), equalTo(now));
   }
   
   @Test
   public void answersMultiplePersistedQuestions() {
      controller.addBooleanQuestion("q1");
      controller.addBooleanQuestion("q2");
      controller.addPercentileQuestion("q3", new String[] { "a1", "a2"});
      
      List<Question> questions = controller.getAll();
      
      assertThat(questions.stream()
            .map(Question::getText)
            .collect(Collectors.toList()), 
         equalTo(Arrays.asList("q1", "q2", "q3")));
   }
   @Test
   public void findsMatchingEntries() {
      controller.addBooleanQuestion("alpha 1");
      controller.addBooleanQuestion("alpha 2");
      controller.addBooleanQuestion("beta 1");
      List<Question> questions = controller.findWithMatchingText("alpha");
      
      assertThat(questions.stream()
            .map(Question::getText)
            .collect(Collectors.toList()),
         equalTo(Arrays.asList("alpha 1", "alpha 2")));
   }
}