Question

我正在尝试开发一个Xunit测试，以确定我的被测控制器是否返回了正确数量的对象。

Controller的getAreas功能如下：

[HttpGet()]
public IActionResult GetAreas()
{
    _logger.LogTrace("AreasController.GetAreas called.");

    try
    {
        // Create an IEnumerable of Area objects by calling the repository.
        var areasFromRepo = _areaRepository.GetAreas();

        var areas = _mapper.Map<IEnumerable<AreaDto>>(areasFromRepo);

        // Return a code 200 'OK' along with an IEnumerable of AreaDto objects mapped from the Area entities.
        return Ok(areas);

    }
    catch (Exception ex)
    {
        _logger.LogError($"Failed to get all Areas: {ex}");

        return StatusCode(500, "An unexpected error occurred. Please try again later.");
    }

}

我的测试类使用Moq来模拟Logger，Repository和AutoMapper。我创建了一个变量来保存我的模拟存储库返回的对象列表：

private List<Area> testAreas = new List<Area>()
{
    new Area
    {
        Id = new Guid("87d8f755-ef60-4cfa-9a4a-c94cff9f8a22"),
        Description = "Buffer Store",
        SortIndex = 1
    },
    new Area
    {
        Id = new Guid("19952c5a-b762-4937-a613-6151c8cd9332"),
        Description = "Fuelling Machine",
        SortIndex = 2
    },
    new Area
    {
        Id = new Guid("87c7e1d8-1ce7-4d8b-965d-5c44338461dd"),
        Description = "Ponds",
        SortIndex = 3
    }
};

我按如下方式创建了我的测试：

[Fact]
public void ReturnAreasForGetAreas()
{
    //Arrange
    var _mockAreaRepository = new Mock<IAreaRepository>();
    _mockAreaRepository
        .Setup(x => x.GetAreas())
        .Returns(testAreas);

    var _mockMapper = new Mock<IMapper>();

    var _mockLogger = new Mock<ILogger<AreasController>>();
    var _sut = new AreasController(_mockAreaRepository.Object, _mockLogger.Object, _mockMapper.Object);

    // Act
    var result = _sut.GetAreas();

    // Assert
    Assert.NotNull(result);
    var objectResult = Assert.IsType<OkObjectResult>(result);
    var model = Assert.IsAssignableFrom<IEnumerable<AreaDto>>(objectResult.Value);
    var modelCount = model.Count();
    Assert.Equal(3, modelCount);
}

最终Assert的测试失败，期待3时测试失败。

result不是null。 objectResult是OkObjectResult。 model是IEnumerable<AreaDto>，但它在集合中包含0个项目。

我看不出我在哪里错了。我是否必须配置模拟的Automapper映射？

Answer 1

我是否必须配置模拟的Automapper映射

是

设置mapper mock以在调用时返回所需的结果。现在它没有设置所以默认为空集合。

创建一个代表DTO的集合

private List<AreaDto> testAreaDTOs = new List<AreaDto>() { new AreaDto { Id = new Guid("87d8f755-ef60-4cfa-9a4a-c94cff9f8a22"), Description = "Buffer Store", SortIndex = 1 }, new AreaDto { Id = new Guid("19952c5a-b762-4937-a613-6151c8cd9332"), Description = "Fuelling Machine", SortIndex = 2 }, new AreaDto { Id = new Guid("87c7e1d8-1ce7-4d8b-965d-5c44338461dd"), Description = "Ponds", SortIndex = 3 } };

在调用模拟映射时，更新测试以使用该集合。

[Fact] public void ReturnAreasForGetAreas() { //Arrange var _mockAreaRepository = new Mock<IAreaRepository>(); _mockAreaRepository .Setup(x => x.GetAreas()) .Returns(testAreas); var _mockMapper = new Mock<IMapper>(); //Fake the mapper _mockMapper .Setup(_ => _.Map<IEnumerable<AreaDto>>(It.IsAny<IEnumerable<Area>>())) .Returns(testAreaDTOs); var _mockLogger = new Mock<ILogger<AreasController>>(); var _sut = new AreasController(_mockAreaRepository.Object, _mockLogger.Object, _mockMapper.Object); // Act var result = _sut.GetAreas(); // Assert Assert.NotNull(result); var objectResult = Assert.IsType<OkObjectResult>(result); var model = Assert.IsAssignableFrom<IEnumerable<AreaDto>>(objectResult.Value); var modelCount = model.Count(); Assert.Equal(3, modelCount); }

ASP.Net Web API 2控制器单元测试获取请求项目计数

1 个答案: