public async Task AddRoleAsync_Failed_ReturnsFailedResult()
        {
            var sut    = new RoleManagerService(TestRoleManager.GetFailedManager());
            var result = await sut.AddRoleAsync(string.Empty);

            result.Succeeded.Should().BeFalse();
        }
        public async Task AddRoleAsync_Successful_ReturnsSuccessResult()
        {
            var sut    = new RoleManagerService(TestRoleManager.GetSuccessfulManager());
            var result = await sut.AddRoleAsync(string.Empty);

            result.Succeeded.Should().BeTrue();
        }