public void Verify_MapToSearchModelExtension_CallsMapToModel() { // Arrange var mockMapper = new Mock <StoryArcWriterMapper>(); mockMapper.Setup(x => x.MapToSearchModel(It.IsAny <IStoryArcWriterModel>())); var mockModel = StoryArcWritersMockingSetup.DoMockingSetupForStoryArcWriterModel(1); StoryArcWriterMapperExtensions.OverrideMapper(mockMapper.Object); // Act mockModel.Object.MapToSearchModel(); // Assert mockMapper.Verify(x => x.MapToSearchModel(It.IsAny <IStoryArcWriterModel>()), Times.Once); }