1
我試圖通過使用Moq模擬數據來測試更新函數。我正在使用實體框架6.Mocked DbSet不返回對象
我可以打印出DbSet的計數，這是預期金額。然而，當它試圖選擇一個對象，它拋出一個異常，NullReferenceException: Object reference not set to an instance of an object.
這裏是我的測試類設置的嘲笑DbSets和DbContext
[TestFixture]
public class ProductControllerTest
{
private ProductController controller;
private IProductRepository productRepo;
private IUnitOfWork unitOfWork;
private IBrandRepository brandRepo;
private ICategoryRepository categoryRepo;
private ISegmentRepository segmentRepo;
private ITypeRepository typeRepo;
private IEnumerable<Product> productList;
[SetUp]
public void Init()
{
IEnumerable<Brand> brandList = new List<Brand>{
new Brand{
Id = 1,
Name = "Unknown"
},
new Brand{
Id = 2,
Name = "Clorox"
},
new Brand{
Id = 3,
Name = "Glad"
}
};
var brandData = brandList.AsQueryable();
productList = new List<Product>{
new Product{
Id = "0000000001",
ParentAsin = "0000000010",
Title = "Mocked Product #1",
ReleaseDate = DateTime.Now,
BrandId = 1,
CategoryId = 1,
SegmentId = 1,
TypeId = 1,
Brand = brandList.ElementAt(0)
},
new Product{
Id = "0000000002",
ParentAsin = "0000000010",
Title = "Mocked Product #2",
ReleaseDate = DateTime.Now,
BrandId = 1,
CategoryId = 1,
SegmentId = 1,
TypeId = 1,
Brand = brandList.ElementAt(0)
},
new Product{
Id = "0000000003",
ParentAsin = "0000000010",
Title = "Mocked Product #3",
ReleaseDate = DateTime.Now,
BrandId = 2,
CategoryId = 3,
SegmentId = 3,
TypeId = 2,
Brand = brandList.ElementAt(1)
}
};
var productData = productList.AsQueryable();
brandList.ElementAt(1).Products.Add(productList.ElementAt<Product>(2));
var mockProductSet = new Mock<DbSet<Product>>();
mockProductSet.As<IQueryable<Product>>().Setup(m => m.Provider).Returns(productData.Provider);
mockProductSet.As<IQueryable<Product>>().Setup(m => m.Expression).Returns(productData.Expression);
mockProductSet.As<IQueryable<Product>>().Setup(m => m.ElementType).Returns(productData.ElementType);
mockProductSet.As<IQueryable<Product>>().Setup(m => m.GetEnumerator()).Returns(productData.GetEnumerator());
var mockBrandSet = new Mock<DbSet<Brand>>();
mockBrandSet.As<IQueryable<Brand>>().Setup(m => m.Provider).Returns(brandData.Provider);
mockBrandSet.As<IQueryable<Brand>>().Setup(m => m.Expression).Returns(brandData.Expression);
mockBrandSet.As<IQueryable<Brand>>().Setup(m => m.ElementType).Returns(brandData.ElementType);
mockBrandSet.As<IQueryable<Brand>>().Setup(m => m.GetEnumerator()).Returns(brandData.GetEnumerator());
var mockContext = new Mock<ApplicationDbContext>() { CallBase = true };
mockContext.Setup(m => m.Set<Product>()).Returns(mockProductSet.Object);
mockContext.Setup(m => m.Set<Brand>()).Returns(mockBrandSet.Object);
unitOfWork = new UnitOfWork(mockContext.Object);
brandRepo = new BrandRepository(mockContext.Object);
productRepo = new ProductRepository(mockContext.Object);
controller = new ProductController(productRepo, unitOfWork, brandRepo, categoryRepo, segmentRepo, typeRepo);
}
[Test]
public void TestReturnEditedModel()
{
Product product = productList.ElementAt<Product>(1);
product.BrandId = 3;
product.CategoryId = 2;
product.SegmentId = 2;
product.TypeId = 3;
controller.Edit(product, "Return value");
Product result = productRepo.Get(product.Id);
Assert.AreEqual(product.Id, result.Id);
Assert.AreEqual(3, result.BrandId);
Assert.AreEqual(2, result.CategoryId);
Assert.AreEqual(2, result.SegmentId);
Assert.AreEqual(3, result.TypeId);
}
}
我只提供了失敗的考驗。
這裏是被稱爲
[HttpPost]
public ActionResult Edit([Bind(Include = "Id,Title,ParentAsin,ReleaseDate,BrandId,CategoryId,SegmentId,TypeId")]Product model, string returnAction)
{
if(!ModelState.IsValid)
{
Dictionary<string, int> selectedIds = new Dictionary<string, int>();
selectedIds.Add("BrandId", model.BrandId);
selectedIds.Add("CategoryId", model.CategoryId);
selectedIds.Add("SegmentId", model.SegmentId);
selectedIds.Add("TypeId", model.TypeId);
PopulateAllDropDownLists(selectedIds);
return View(model);
}
model.Brand = _brandRepo.Get(model.BrandId);
model.Category = _categoryRepo.Get(model.CategoryId);
model.Segment = _segmentRepo.Get(model.SegmentId);
model.Type = _typeRepo.Get(model.TypeId);
_repository.Update(model);
_unitOfWork.SaveChanges();
return RedirectToAction(returnAction);
}
_brandRepo是IBrandRepository類型的和所有的實施方式和繼承後，功能Get()處於通用庫類的控制器功能。
這是Get函數被調用。
public virtual TEntity Get(TId id)
{
return this.DbSet.Single(x => (object)x.Id == (object)id);
}
返回行是什麼引發錯誤。
由於這是一個測試，我嘲笑的數據，我知道傳入的Id是正確的。它以int開始，而Id的Brand也是int，但是爲了使其具有這種通用性，屬性的類型爲TId是所有模型實現的接口TEntity的通用類型。
這裏是TEntity
public interface IEntity<TId>
{
/// <summary>
/// Gets or sets the unique identifier.
/// </summary>
/// <value>The unique identifier.</value>
TId Id { get; set; }
}
我不知道這是否是一個嘲諷的問題或使用泛型類型的問題。有人可以幫助這個。
你能用較小的單元測試重現這個嗎？你的例子中有很多。 – 2014-09-23 20:53:46
@RyanGates我拿出了測試設置的代碼，我仍然能夠重新創建錯誤。當我查詢嘲笑的'DbSet' –
DFord
2014-09-23 21:09:53