Android JUnit测试中的运行时异常

import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.ExpectedException;

import static org.junit.Assert.assertEquals;

public class MyTest {
    @Rule
    public ExpectedException thrown = ExpectedException.none();

    @Test
    public void testRuntimeException() {
        MyObject obj = new MyObject();
        thrown.expect(RuntimeException.class);
        thrown.expectMessage("This is a runtime exception");
        obj.doSomething();
    }
}