在Java中，如何使用JUnit验证抛出的异常？

在Java中，如何使用JUnit验证抛出的异常？

在JUnit
4中，可以使用ExpectedException规则轻松完成此 *** 作。

这是来自javadocs的示例：

// These tests all pass.public static class HasExpectedException {    @Rule    public ExpectedException thrown = ExpectedException.none();    @Test    public void throwsNothing() {        // no exception expected, none thrown: passes.    }    @Test    public void throwsNullPointerException() {        thrown.expect(NullPointerException.class);        throw new NullPointerException();    }    @Test    public void throwsNullPointerExceptionWithMessage() {        thrown.expect(NullPointerException.class);        thrown.expectMessage("happened?");        thrown.expectMessage(startsWith("What"));        throw new NullPointerException("What happened?");    }}