public async Task UpdateDone_RedirectsToIndex_WhenTodoItemIsUpdated()
{
this._todoItemServiceMock
.Setup(service => service.UpdateDoneAsync(It.IsAny <Guid>(), It.IsAny <ApplicationUser>()))
.ReturnsAsync(true);
var result = await _todosController.UpdateDone(Guid.NewGuid());
Assert.IsType <RedirectToActionResult>(result);
Assert.Equal("Index", (result as RedirectToActionResult).ActionName);
}