TestNG: How to test for mandatory exceptions?

Question

I\'d like to write a TestNG test to make sure an exception is thrown under a specific condition, and fail the test if the exception is not thrown. Is there an easy way to do

Answer 1

if you are using java 7 and testng this can be used for java 8 you can also use lambda expressions

class A implements ThrowingRunnable{


            @Override
            public void run() throws AuthenticationFailedException{
                spy.processAuthenticationResponse(mockRequest, mockResponse, authenticationContext);
            }
        }
        assertThrows(AuthenticationFailedException.class,new A());