Why JUnit Testing exception always fail? [duplicate]

Question

I'm using JUnit 4.11.

Eclipse Version: Luna Service Release 2 (4.4.2)

I need do the exception test. The code maybe like this:

// 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());
    }
}

But the test always fail, where am i wrong?

Answer 1

When you provide an expected exception to the Test annotation, the test will only succeed if the exception expected is thrown from the test method. However, you catch the exception before it propagates out of the method.

It looks like you want to test the exception message too, so re-throw the exception e to satisfy the test. Depending on whether it's checked, you may need a throws clause on the method.