Question

If a method throwing an exception, how to write a test case to verify that method is actually throwing the expected exception?

Answer 1

You can try and catch the desired exception and do something like assertTrue(true):

@Test
testIfThrowsException(){
    try{
        funcThatShouldThrowException(arg1, agr2, agr3);
        assertTrue("Exception wasn't thrown", false);
    }
    catch(DesiredException de){
        assertTrue(true);
    }
}