JUnit5

Question

是否有等同于 ExpectedException.expectCause() (JUnit4) 的 JUnit5？ https://junit.org/junit4/javadoc/4.12/org/junit/rules/ExpectedException.html#expectCause(org.hamcrest.Matcher)

Answer 1

这是一个例子：

public class ExpectedExceptionTest {

    @Test
    public void shouldThrow() {
        IOException exc = Assertions.assertThrows(IOException.class, this::throwing);
        Assertions.assertEquals("root cause", exc.getCause().getMessage());
    }

    private void throwing() throws IOException {
        throw new IOException(new IllegalStateException("root cause"));
    }
}

就我个人而言，我更喜欢 AssertJ，它具有很好的描述性 exception assertions。

Answer 2

我们将 ExpectedException.expectCause() 替换为：

ThrowableAssert.ThrowingCallable throwingCallable  = () -> someClass.methodWhichThrowAnException(someData);
assertThatThrownBy(throwingCallable).hasCauseInstanceOf(SomeException.class);

JUnit5 - ExpectedException.expectCause() 等效

JUnit5 - ExpectedException.expectCause() equivalent