Junit5：期望嵌套异常

如何解决Junit5：期望嵌套异常

JUnit 5 如何允许检查嵌套异常？我正在寻找可以在 @org.junit.Rule 的帮助下在 JUnit 4 中完成的工作，如以下代码段所示：

class MyTest {

    @Rule
    public ExpectedException expectedException = ExpectedException.none();

    @Test
    public void checkFornestedException() {

        // a JPA exception will be thrown,with a nested LazyInitializationException
        expectedException.expectCause(isA(LazyInitializationException.class));

        Sample s = sampleRepository.findOne(id);

        // not touching results triggers exception
        sampleRepository.delete(s);
    }
}

根据评论编辑：

在 JUnit 5 中 Assertions.assertThrows(LazyInitializationException.class) 不起作用，因为 LazyInitializationException 是 JpaSystemException 的嵌套异常（原因）。

只能对外部异常进行检查，这不是我们想要的：

// assertThrows does not allow to check for nested LazyInitializationException
Assertions.assertThrows(JpaSystemException.class,() -> {

    Sample s = sampleRepository.getone(id);

    // not touching results triggers exception
    sampleRepository.delete(s);
});

解决方法

感谢 johanneslink，解决方案其实很简单：

// assertThrows returns the thrown exception (a JpaSystemException)
Exception e = Assertions.assertThrows(JpaSystemException.class,() -> {

    Sample s = sampleRepository.getOne(id);

    // not touching results triggers exception
    sampleRepository.delete(s);
});

// Now the cause of the thrown exception can be checked
assertTrue(e.getCause() instanceof LazyInitializationException);