獲取對象空例外，而單元測試後方法的WebAPI

Question

MoviesController

/// <summary> 
/// Creates a New Movie in Movie Data Source 
/// </summary> 
/// <param name="movie">Movie</param> 
/// <returns>HttpResponseMessage</returns> 
public HttpResponseMessage Post(Movie movie) 
{ 
    try 
    { 
     int i = repository.InsertMovie(movie); 
     var response = Request.CreateResponse<Movie>(HttpStatusCode.Created, movie); 
     **string uri = Url.Link("DefaultApiWithMovieId", new { movieId = i });** 
     response.Headers.Location = new Uri(uri); 
     return response; 
    } 
    catch(Exception ex) 
    { 
     throw new HttpResponseException(HttpStatusCode.BadRequest); 
    } 
} 

WebApiConfig

config.Routes.MapHttpRoute(
       name: "DefaultApiWithMovieId", 
       routeTemplate: "api/{controller}/{movieId}", 
       defaults: new { movieId = RouteParameter.Optional } 
      ); 

      config.Routes.MapHttpRoute(
       name: "DefaultApi", 
       routeTemplate: "api/{controller}/{id}", 
       defaults: new { id = RouteParameter.Optional } 
      ); 

測試方法

[TestMethod] 
public void Post_Movie_Returns_StatusCode_Created() 
{ 

    MoviesController controller = new MoviesController(movieRepository.Object); 
    var config = new HttpConfiguration(); 
    var request = new HttpRequestMessage(HttpMethod.Post, "http://localhost/api/movies"); 
    var route = config.Routes.MapHttpRoute("DefaultApiWithMovieId", "api/{controller}/{movieId}"); 
    var routeData = new HttpRouteData(route, new HttpRouteValueDictionary { { "controller", "movies" } }); 
    //var controller = new ProductsController(repo); 
    controller.ControllerContext = new HttpControllerContext(config, routeData, request); 
    controller.Request = request; 
    controller.Request.Properties[HttpPropertyKeys.HttpConfigurationKey] = config; 
    Movie movie = new Movie() { Title = "SpiderMan", ReleaseYear = 09, Rating = 4, MovieId = 81, Genre = "Romance", Classification = "Good", Cast = { } }; 
    movieRepository.Setup(x => x.InsertMovie(It.IsAny<Movie>())).Returns(movie.MovieId); 
    var result = controller.Post(movie); 
    Assert.AreEqual(HttpStatusCode.Created, result.StatusCode); 

} 

在執行上面的測試用例時，在In Controller post方法中，在突出顯示的行處，我正在使用exeception 未將對象引用設置爲對象的實例。

Answer 1

您沒有將routeData發送到請求中。添加此行：

controller.Request.Properties[HttpPropertyKeys.HttpRouteDataKey] = routeData;