How do I mock AsNoTracking method?
In below example, DbContext has injected to the service class.It works fine if I remove AsNoTracking extension method from GetOrderedProducts method, but with AsNoTracking test fails because it returns null.
I've also tried to mock AsNoTracking to return proper value but it didn't work.
public interface IUnitOfWork
{
IDbSet<TEntity> Set<TEntity>() where TEntity : class;
int SaveAllChanges();
}
public class Entites : DbContext, IUnitOfWork
{
public virtual DbSet<Product> Products { get; set; } // This is virtual because Moq needs to override the behaviour
public new virtual IDbSet<TEntity> Set<TEntity>() where TEntity : class // This is virtual because Moq needs to override the behaviour
{
return base.Set<TEntity>();
}
public int SaveAllChanges()
{
return base.SaveChanges();
}
}
public class ProductService
{
private readonly IDbSet<Product> _products;
private readonly IUnitOfWork _uow;
public ProductService(IUnitOfWork uow)
{
_uow = uow;
_products = _uow.Set<Product>();
}
public IEnumerable<Product> GetOrderedProducts()
{
return _products.AsNoTracking().OrderBy(x => x.Name).ToList();
}
}
[TestFixture]
public class ProductServiceTest
{
private readonly ProductService _productService;
public ProductServiceTest()
{
IQueryable<Product> data = GetRoadNetworks().AsQueryable();
var mockSet = new Mock<DbSet<Product>>();
mockSet.As<IQueryable<Product>>().Setup(m => m.Provider).Returns(data.Provider);
mockSet.As<IQueryable<Product>>().Setup(m => m.Expression).Returns(data.Expression);
mockSet.As<IQueryable<Product>>().Setup(m => m.ElementType).Returns(data.ElementType);
mockSet.As<IQueryable<Product>>().Setup(m => m.GetEnumerator()).Returns(data.GetEnumerator());
var context = new Mock<Entites>();
context.Setup(c => c.Products).Returns(mockSet.Object);
context.Setup(m => m.Set<Product>()).Returns(mockSet.Object);
context.Setup(c => c.Products.AsNoTracking()).Returns(mockSet.Object);
_productService = new ProductService(context.Object);
}
private IEnumerable<Product> GetRoadNetworks()
{
return new List<Product>
{
new Product
{
Id = 1,
Name = "A"
},
new Product
{
Id = 2,
Name = "B"
},
new Product
{
Id = 1,
Name = "C"
}
};
}
[Test]
public void GetOrderedProductTest()
{
IEnumerable<Product> products = _productService.GetOrderedProducts();
List<string> names = products.Select(x => x.Name).ToList();
var expected = new List<string> {"A", "B", "C"};
CollectionAssert.AreEqual(names, expected);
}
}
The problem is AsNoTracking returns null in unit test
