我怎样才能获得相当于
Substitute.For<DbSet<MyClass>, IQueryable<MyClass>, IDbAsyncEnumerable>()
用 machine.fakes?我尝试使用
var myFake = An<DbSet<MyClass>>();
myFake.WhenToldTo(m => ((IQueryable<MyClass>)m).Provider).Return(whatever);
但我得到以下 NotImplementedException:
The member 'IQueryable.Provider' has not been implemented on type 'DbSet`1Proxy' which
inherits from 'DbSet`1'. Test doubles for 'DbSet`1' must provide implementations of
methods and properties that are used.
myFake.WhenToldTo(m => ((IQueryable)m).Provider).Return(whatever); 引发相同的异常。
这是一个用最少的代码重现问题的类。您需要为实体框架、Machine.Specifications、Machie.Specifications.Should、Machine.Fakes、Machine.Fakes.NSubstitute、NSubstitute(或任何其他 Mock Framework 插件)添加包
using System.Data.Entity;
using System.Linq;
using Machine.Fakes;
using Machine.Specifications;
namespace SpecsTests
{
public class TestClass
{}
[Subject("Test")]
internal class TestSpecifications
{
[Subject("Test")]
private class Test : WithFakes
{
private static int Count;
private static DbSet<TestClass> Subject;
private Establish context = () =>
{
var data = new [] { new TestClass() }.AsQueryable();
Subject = An<DbSet<TestClass>>();
Subject.WhenToldTo(m => ((IQueryable)m).Provider).Return( data.Provider);
};
private Because of = () => { Count = Subject.Count(); };
private It Should_return_expected_results = () =>
{
Count.ShouldEqual(1);
};
}
}
}