public void DeleteEntityReturnsCalled() { //Setup var mService = new Mock <ITeacherService>(); mService.Setup(mock => mock.DeleteEntity(It.IsAny <int>())); //Action var controller = new TeacherController(mService.Object); controller.DeleteEntityById(It.IsAny <int>()); //Assert mService.Verify(mock => mock.DeleteEntity(It.IsAny <int>()), Times.Once); }