public void DeleteRole_ShouldDeleteARole()
        {
            // arrange
            var controller     = new MembershipController();
            var roleIdToDelete = controller.GetRoles().Where(r => r.Name == "測試角色AAA").Select(r => r.Id).First();

            // act
            var result = controller.DeleteRole(roleIdToDelete) as OkNegotiatedContentResult <RoleViewModel>;

            // assert
            Assert.IsNotNull(result);
            Assert.IsNotNull(result.Content);
            Assert.IsTrue(result.Content.Id > 0);
        }