public void TestServiceShouldCallRepoMethodOnce()
{
//Given
var mockRepo = new Mock <IWatchRepository>();
var service = new WatchService(mockRepo.Object);
//When
mockRepo.Setup(mr => mr.RemoveMachineSubscriptionFromWatch(It.IsAny <MachineWatch>()));
service.DeleteMachineSubscriptionFromWatch(new MachineWatch());
//Then
mockRepo.Verify(mr => mr.RemoveMachineSubscriptionFromWatch(It.IsAny <MachineWatch>()), Times.Once);
}