public void DeleteRole_Success_Test()
{
//get all the roles from the db
List <Role> previousRoles = rolesBL.GetAllRoles().ToList <Role>();
//successfully delete role
Role r = rolesBL.GetRole(13);
rolesBL.DeleteRole(r.RoleID);
List <Role> expectedRoles = new List <Role>();
expectedRoles.AddRange(previousRoles); //add the previous Roles to the list
expectedRoles.RemoveAll(x => x.RoleID == r.RoleID);
List <Role> actualRoles = rolesBL.GetAllRoles().ToList <Role>();
//check if expected roles with the actual roles are equal
AreListsEqual(expectedRoles, actualRoles);
}