public void Verify_MapToEntityExtension_CallsMapToEntity() { // Arrange var mockMapper = new Mock <EpisodeStoryArcMapper>(); mockMapper.Setup(x => x.MapToEntity(It.IsAny <IEpisodeStoryArcModel>(), It.IsAny <int>())); var mockModel = EpisodeStoryArcsMockingSetup.DoMockingSetupForEpisodeStoryArcModel(1); EpisodeStoryArcMapperExtensions.OverrideMapper(mockMapper.Object); // Act mockModel.Object.MapToEntity(); // Assert mockMapper.Verify(x => x.MapToEntity(It.IsAny <IEpisodeStoryArcModel>(), It.IsAny <int>()), Times.Once); }