public void UpdateFriendById_WhenUpdatedWithExistingId_ReturnsOkResult()
{
var friend = new FriendUpdateInputModel()
{
FirstName = "Lárus",
};
var okResult = _controller.UpdateFriendById(1, friend);
var result = Assert.IsType <OkObjectResult>(okResult);
Assert.Equal(200, result.StatusCode);
}