Eclipse版本：Luna Service Release 2(4.4.2)

我需要做异常测试.代码可能是这样的：

// src code
public void myMethod throws MyException {
    ...
    throw new MyException(msg);
    ...
}
 
// test code
@Test (expected = MyException.class)
public void testMyMethod() {
    try {
        myMethod();
        fail();
    } catch (MyException e) {
        assertEquals(expectedStr,e.getMessage());
    }
}

但测试总是失败,我错在哪里？