public @Test final void testRemoveGrantsNegative(){
  Role role=new Role(TEST_ROLE);
  thrown.expect(IllegalArgumentException.class);
  role.removeGrants(null);
}

public @ Test final void testRemoveGrantsNegative ( ) { Role role = new Role ( TEST_ROLE ) ; thrown . expect ( IllegalArgumentException . class ) ; role . removeGrants ( null ) ; }
removing null from the list of grants must fail .
