Moq.Dapper QueryAsync不适用于模拟的事务对象

Question

我正在尝试测试使用QueryAsync（）的存储库方法，并且该方法在事务下。 所以我在嘲笑IDbConnection以及IDbTransaction。 但是当我运行测试用例时，它给出了一个错误

“无法将类型为'Castle.Proxies.IDbTransactionProxy'的对象转换为类型为'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运行它以重现相同的问题https://dotnetfiddle.net/40lMbh

Answer 1

根据异常消息，看起来QueryAsync扩展方法使用了DbTransaction

因此，请改用抽象的DbTransaction ，它会通过。

TestMoqDapperExecuteAsyncIDbConnectionWithTransaction（）

//...

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

//...

在提供的小提琴上对其进行了测试，并且可以正常工作。