Moq.Dapper QueryAsync不適用於模擬的事務對象

Question

我正在嘗試測試使用QueryAsync（）的存儲庫方法，並且該方法在事務下。 所以我在嘲笑IDbConnection以及IDbTransaction。 但是當我運行測試用例時，它給出了一個錯誤

“無法將類型為'Castle.Proxies.IDbTransactionProxy'的對象轉換為類型為'System.Data.Common.DbTransaction'”

using System;
using Dapper;
using Moq;
using Moq.Dapper;
using System.Data;
using System.Data.Common;
using System.Linq;
using System.Collections.Generic;

public class Program
{
public class ComplexType
{
    public string StringProperty { get; set; }
    public int IntegerProperty { get; set; }
}


private static void TestMoqDapperExecuteAsyncIDbConnectionWithoutTransaction()
{
        var connection = new Mock<IDbConnection>();

        connection.SetupDapperAsync(c => c.QueryAsync<int>(It.IsAny<string>(), It.IsAny<object>(), It.IsAny<IDbTransaction>(), It.IsAny<int>(), It.IsAny<CommandType>()))
                  .ReturnsAsync(new List<int>
        {
            5
        });

        var result = connection.Object
                               .QueryAsync<int>("")
                               .GetAwaiter()
                               .GetResult();

    Console.WriteLine(string.Format(" Test without transaction {0}", result.Count() != 0 ? "PASSED" : "FAILED"));
}

private static void TestMoqDapperExecuteAsyncIDbConnectionWithTransaction()
{
        var connection = new Mock<IDbConnection>();
        var tran= new Mock<IDbTransaction>();

        connection.SetupDapperAsync(c => c.QueryAsync<int>(It.IsAny<string>(), It.IsAny<object>(), It.IsAny<IDbTransaction>(), It.IsAny<int>(), It.IsAny<CommandType>()))
                  .ReturnsAsync(new List<int>
        {
            5
        });

        var result = connection.Object
                               .QueryAsync<int>("",null,tran.Object)
                               .GetAwaiter()
                               .GetResult();

    Console.WriteLine(string.Format("Test  with transaction {0}", result.Count() != 0 ? "PASSED" : "FAILED"));
}

public static void Main()
{   
    TestMoqDapperExecuteAsyncIDbConnectionWithoutTransaction();
    TestMoqDapperExecuteAsyncIDbConnectionWithTransaction();
}

}

您也可以在小提琴上運行它以重現相同的問題https://dotnetfiddle.net/40lMbh

Answer 1

根據異常消息，看起來QueryAsync擴展方法使用了DbTransaction

因此，請改用抽象的DbTransaction ，它會通過。

TestMoqDapperExecuteAsyncIDbConnectionWithTransaction（）

//...

var tran = new Mock<DbTransaction>(); //<--Note abstract class instead of interface

//...

在提供的小提琴上對其進行了測試，並且可以正常工作。