C# xUnit-如何在类的真实对象上设置mock方法

这是我编写单元测试的代码：

        public override BaseSupportModel BuildData(long? parentId)
        {
          List<ParentModel> parents = ParentMapper.MinMap(GetAll<Parent>().AsEnumerable());
          supportModel.Lists.Add("parentList", parents );
          return supportModel;
        }

我需要设置

GetAll

方法，该方法由BuildData方法调用以返回测试数据

如何设置此方法以返回实际实例的测试数据

s.Setup(i => i.GetAll()).Returns(new List<Parent>().AsQueryable()); 

s.Setup（i=>i.GetAll（））.Returns（newlist（）.AsQueryable（））；

这段代码显然没有任何区别

有什么办法让它工作吗

    [Fact()]
    public void BuildDataTest()
    {
        //setup dependencies
        var services = new Microsoft.Extensions.DependencyInjection.ServiceCollection();
        ServiceCollection.Register(services);
        var serviceProvider = services.BuildServiceProvider();
        DependencyResolver.Init(serviceProvider);

        //create real object.
        var builder = new ExampleBuilder();

        // Trying to mock method which doesn't work
        var s = new Mock<IBasicManager<Parent>>();
        s.Setup(i => i.GetAll()).Returns(new List<Parent>().AsQueryable());
        
        var response = builder.BuildData(1);
        Assert.NotNull(response);

    }

s.Setup(i => i.GetAll()).Returns(new List<Parent>().AsQueryable());