如何设置MS Fakes对象的返回值?

Question

我用OData V4 Client Code Generator生成了一个 OData 客户端代码。如果没有 MS Fakes，生成的代码将无法进行单元测试，因此我从中生成了一个假程序集。现在我有一个如何实际设置方法的返回值的问题。

生成的代码中的"core"类称为System：

[global::Microsoft.OData.Client.OriginalNameAttribute("System")]
public partial class System : global::Microsoft.OData.Client.DataServiceContext
{
/// <summary>
/// Initialize a new System object.
/// </summary>
[global::System.CodeDom.Compiler.GeneratedCodeAttribute("Microsoft.OData.Client.Design.T4", "2.4.0")]
public System(global::System.Uri serviceRoot) : 
base(serviceRoot, global::Microsoft.OData.Client.ODataProtocolVersion.V4)
{
this.ResolveName = new global::System.Func<global::System.Type, string>(this.ResolveNameFromType);
this.ResolveType = new global::System.Func<string, global::System.Type>(this.ResolveTypeFromName);
this.OnContextCreated();
this.Format.LoadServiceModel = GeneratedEdmModel.GetInstance;
this.Format.UseJson();
}
[global::System.CodeDom.Compiler.GeneratedCodeAttribute("Microsoft.OData.Client.Design.T4", "2.4.0")]
[global::Microsoft.OData.Client.OriginalNameAttribute("salesorders")]
public global::Microsoft.OData.Client.DataServiceQuery<Salesorder> Salesorders
{
get
{
if ((this._Salesorders == null))
{
this._Salesorders = base.CreateQuery<Salesorder>("salesorders");
}
return this._Salesorders;
}
}
[global::System.CodeDom.Compiler.GeneratedCodeAttribute("Microsoft.OData.Client.Design.T4", "2.4.0")]
private global::Microsoft.OData.Client.DataServiceQuery<Salesorder> _Salesorders;
... continues from here and contains all the strongly typed classes...
}

现在，如您所见，属性Salesorders是DataServiceQuery<Salesorder>它将 Linq 表达式作为参数。

我尝试手动设置查询，但它不起作用，而且在测试用例中指定实际查询似乎有点多余。基本上，我所需要的只是返回列表(或可枚举)的方法，就像我可以使用 Moq 时所做的那样。

编辑：我找到了一篇关于将Fakes与较旧的CRM代码生成器一起使用的旧文章，但在这种情况下它对我没有多大帮助(https://zhongchenzhou.wordpress.com/2012/07/10/dynamics-crm-2011-unit-test-part-2-microsoft-fakes-with-linq-query)

_client = new ODataClient.Microsoft.Dynamics.CRM.Fakes.StubSystem(new System.Uri(...
_dao = new DataAccess.DataAccess(_client);
using (ShimsContext.Create())
{
var query = from a in _client.Salesorders select a;
ODataClient.Microsoft.Dynamics.CRM.Fakes.ShimSystem.AllInstances.SalesordersGet = (c) =>
{
return new Microsoft.OData.Client.DataServiceQuery<Salesorder>( // how?
};
// This fails                _dao.GetSalesordersByAccountAndContactId(Guid.NewGuid().ToString(), Guid.NewGuid().ToString());
}

Answer 1

using (ShimsContext.Create())
{
var client = new ODataClient.Microsoft.Dynamics.CRM.Fakes.ShimSystem();
IDataAccess dao = new DataAccess.DataAccess(client);
var salesorders = new List<Salesorder>
{
new Salesorder()
};
IQueryable<Salesorder> queryableData = salesorders.AsQueryable();
var queryShim = new Microsoft.OData.Client.Fakes.ShimDataServiceQuery<Salesorder>();
queryShim.ExpressionGet = () => queryableData.Expression;
queryShim.ElementTypeGet = () => queryableData.ElementType;
queryShim.ProviderGet = () => queryableData.Provider;
queryShim.GetEnumerator = () => queryableData.GetEnumerator();
DataClient.Microsoft.Dynamics.CRM.Fakes.ShimSystem.SalesordersGet = () => queryShim;
}