c# - 对继承类的最小起订量测试总是返回 null

Question

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

中定义的字符串“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 
    ...
}

Controller

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());
}

Answer 1

设置中的参数匹配器与被测对象中实际调用的匹配器不匹配，因此模拟在执行测试时调用时不会按预期运行。

主题正在调用

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

虽然模拟的依赖期望

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

使用 It.IsAny<T>() 配置模拟以完全匹配预期的内容或放松预期的匹配

[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);
}