构建 ASP.NET Core Web API 单元测试时出错

如何解决构建 ASP.NET Core Web API 单元测试时出错

我正在尝试为我构建的 Web API 创建单元测试。我使用 Moq 和 xUnit.net 进行测试。我收到以下错误

CS1929 'ISetup' 不包含 'ReturnsAsync' 的定义和最佳扩展方法重载 'SequenceExtensions.ReturnsAsync(ISetupSequentialResult,ExtractGroupDto)' 需要类型为 'ISetupSequentialResult 的接收器'

谁能帮我纠正错误，或提供替代代码来解决这个问题？

以下是API代码：

public class ExtractGroupController : ControllerBase
{
    private readonly dsf_localContext _context;
    private readonly IMapper _mapper;

    public ExtractGroupController(dsf_localContext context,IMapper mapper)
    {
        _context = context;
        _mapper = mapper;
    }

    // GET: api/ExtractGroup/5
    [HttpGet("{id}")]
    public async Task<ActionResult<ExtractGroupDto>> GetExtractGroup(int id)
    {
        var extractGroup = await _context.ExtractGroups.FindAsync(id);

        if (extractGroup == null)
        {
            return NotFound();
        }

        return _mapper.Map<ExtractGroupDto>(extractGroup);
    }}

这是单元测试代码（我按照我自己项目的教程中的步骤操作）

public class ExtractGroupControllerTests
{
    private readonly ExtractGroupController _sut;
    private readonly Mock<dsf_localContext> _repoMock = new Mock<dsf_localContext>();
    private readonly Mock<IMapper> _mapperMock = new Mock<IMapper>();

    public ExtractGroupControllerTests()
    {
        _sut = new ExtractGroupController(_repoMock.Object,_mapperMock.Object);
    }
    [Fact]
    public async Task GetExtractGroup()
    {
        //Arrange
        int dataId = 1;
        var extractGroupDto = new ExtractGroupDto
        {
            CreatedBy = "XYZ",CreatedOn = DateTime.Now,ModifiedBy = "XYZ",ModifiedOn = DateTime.Now,ExtractGroupId = 1,ExtractGroupName = "test",ExtractGroupDescription = "test desc",ActiveFlag = "1"
        };
        _repoMock.Setup(x => x.ExtractGroups.FindAsync(dataId)).ReturnsAsync(extractGroupDto);
        //Act
        var result = await _sut.GetExtractGroup(dataId);
        //Assert
        Assert.Equal(dataId,result.Value.ExtractGroupId);
    }
}