public void RemoveActivity_Succeeds()
{
int activityId = 1;
_activityRepository.Setup(a => a.GetById(activityId)).Returns(_dummyDBContext.Activity1);
ActionResult <Activity> actionResult = _controller.Remove(activityId);
OkObjectResult okObjectResult = actionResult.Result as OkObjectResult;
Activity activity = okObjectResult.Value as Activity;
Assert.Equal("Testatelier", activity.Name);
Assert.NotNull(activity);
_activityRepository.Verify(a => a.Remove(It.IsAny <Activity>()), Times.Once());
_activityRepository.Verify(a => a.SaveChanges(), Times.Once());
}