How to test assert throws exception in Android

Question

is there a more elegant way to do an assert throws exception in Android then this?

public void testGetNonExistingKey() {   
        try {
            alarm.getValue("NotExistingValue");
            fail( );
        } catch (ElementNotFoundException e) {

        }
}

Something like this does not work?!

    @Test(expected=ElementNotFoundException .class)

Thanks, Mark

Answer 1

Are you using a junit4 test runner? The @Test annotation won't work if you're running a junit3 test runner. Check the version that you're using.

Secondly, the recommended way to check for exceptions in your code is to use a Rule (introduced in junit 4.7).

@Rule
public ExpectedException exception = ExpectedException.none();

@Test
public void throwsIllegalArgumentExceptionIfIconIsNull() {
    // do something

    exception.expect(IllegalArgumentException.class);
    exception.expectMessage("Icon is null, not a file, or doesn't exist.");
    new DigitalAssetManager(null, null);
}

You can continue to use the @Test(expected=IOException.class), but the above has the advantage that if an exception is thrown before the exception.expect is called, then the test will fail.