当方法在jUnit中抛出异常时

Question

对于在jUnit测试中抛出异常的方法,您如何处理？如您所见,该类中的addAnswer方法Question可能会抛出异常.在shouldFailifTwoAnswerAreCorrect方法中,我想检查是否抛出了异常,但是在shouldAddAnswersToQuestion

我应该MultipleAnswersAreCorrectException从私有addAnswerToQuestion方法中添加throws 并尝试/ catch shouldAddAnswersToQuestion或者在该方法中抛出它吗？

当方法在测试中抛出异常时,你会怎么做？

public class QuestionTest {

    private Question question;

    @Before
    public void setUp() throws Exception {
        question = new Question("How many wheels are there on a car?", "car.png");
    }

    @Test
    public void shouldAddAnswersToQuestion() {

        addAnswerToQuestion(new Answer("It is 3", false));
        addAnswerToQuestion(new Answer("It is 4", true));
        addAnswerToQuestion(new Answer("It is 5", false));
        addAnswerToQuestion(new Answer("It is 6", false));

        assertEquals(4, question.getAnswers().size());
    }

    @Test(expected = MultipleAnswersAreCorrectException.class)
    public void shouldFailIfTwoAnswersAreCorrect() {

        addAnswerToQuestion(new Answer("It is 3", false));
        addAnswerToQuestion(new Answer("It is 4", true));
        addAnswerToQuestion(new Answer("It is 5", true));
        addAnswerToQuestion(new Answer("It is 6", false));
    }

    private void addAnswerToQuestion(Answer answer) {
        question.addAnswer(answer);
    }
}

问题类中的方法

public void addAnswer(Answer answer) throws MultipleAnswersAreCorrectException {

    boolean correctAnswerAdded = false;

    for (Answer element : answers) {
        if (element.getCorrect()) {
            correctAnswerAdded = true;
        }
    }

    if (correctAnswerAdded) {
        throw new MultipleAnswersAreCorrectException();
    } else {
        answers.add(answer);    
    }
}

Answer 1

你必须添加throws声明addAnswerToQuestion然后尝试/捕获异常或使用expected属性或@Test:

@Test(expected=IOException.class)
public void test() {
    // test that should throw IOException to succeed.
}