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c# - 继承类的 Moq 测试总是返回 null

问题描述

我在为实现存储库模式的控制器设置单元测试时遇到问题。我想检查控制器的返回值。在为存储库设置我的 Mock 时，继承的 IRepository 方法总是返回null. 我期待看到我在.ReturnsAsync("test")

存储库

public interface IRepository
{
    Task<T> Get<T>(string storedProcedure, object template);

    Task<T> Get<T>(string sql, CommandType commandType, object template);
}

public interface ITARRepository : IRepository
{
    // other methods 
    ...
}

控制器

private readonly ITARRepository Repository;

public async Task<IActionResult> GetTARTrackerResponse(long id)
{
    try
    {
        var result = await Repository.Get<string>("spName", new { @Params = id });

        return Ok(result);
    }
    catch (Exception e)
    {
        // logged
        ...

        return StatusCode((int)HttpStatusCode.InternalServerError);
    }
}

测试

[Fact]
public async Task Returns_OK_With_Tar_Tracker_Response()
{
    //arrange
    var mockRepo = new Mock<ITARRepository>();

    mockRepo
        .Setup(repo => repo.Get<string>("storedproc", new { test = 12345 }))
        .ReturnsAsync("test");

    var controller = new TARTrackerController(Logger, mockRepo.Object);

    //act
    var result = await controller.GetTARTrackerResponse(12345);
    var ObjectResult = result as ObjectResult;

    //assert
    Assert.IsType<OkObjectResult>(result);
    Assert.IsType<string>(ObjectResult.Value.GetType());
}

标签： c#unit-testinginheritancemoqxunit

解决方案

设置中的参数匹配器与被测主题中实际调用的内容不匹配，因此在执行测试时调用模拟不会按预期运行。

主题正在调用

var result = await Repository.Get<string>("spName", new { @Params = id });

虽然模拟依赖期望

.Setup(repo => repo.Get<string>("storedproc", new { test = 12345 }))

配置模拟以完全匹配预期或使用放松预期匹配It.IsAny<T>()

[Fact]
public async Task Returns_OK_With_Tar_Tracker_Response() {
    //arrange    
    string expected = "test";
    var mockRepo = new Mock<ITARRepository>();
    mockRepo
        .Setup(repo => repo.Get<string>(It.IsAny<string>(), It.IsAny<object>()))
        .ReturnsAsync(expected);

    var controller = new TARTrackerController(Logger, mockRepo.Object);

    //act
    var result = await controller.GetTARTrackerResponse(12345);    

    //assert
    OkObjectResult objectResult = Assert.IsType<OkObjectResult>(result);
    string actual = Assert.IsType<string>(objectResult.Value);
    Assert.Equal(expected, actual);
}

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