如何模拟 return 类型是 'async Task<(IList<ModelClass>, PaginationModel)>'？

Question

我的模拟设置如下

public class LicensePathControllerTest
{
  private MockRepository mockRepository;
}
public LicensePathControllerTest()
{
 this.mockRepository = new MockRepository(MockBehavior.Strict);
 this.mockIJobLicensePathService = 
 this.mockRepository.Create<IJobLicensePathService>();
 this.mockLog = this.mockRepository.Create<ILog>();
}
private LicensePathController CreateLicensePathController()
{
  return new LicensePathController(
this.mockIJobLicensePathService.Object,this.mockLog.Object);
}

我的方法是

public async Task<IActionResult> GetLicensePath([FromBody] PathSearch pathSearch)
{
    var (paths, pagination) = await _pathService.GetJobPathByFilters(pathSearch); //need to mock this line.
    return ok(new OkResponse<IList<JobLicensePath>>(licensePaths, pagination.PageNumber, pagination.PageSize, pagination.TotalPages, pagination.TotalCount));
}

我的服务class方法也返回

public async Task<(IList<JobLicensePath>, PaginationModel)> GetJobPathByFilters(PathSearch pathSearch)
{
    //...
    IEnumerable<JobLicensePath> objJobLicensePath = null;
    objJobLicensePath = await _baseRepository.GetAsync<JobLicensePath>(filter: expression, null, null, skip: skipVal, take: take, false);
    return (objJobPath.ToList(), new PaginationModel(pageNumber, pageSize, totalCount));
}

我正在尝试模拟以下几个试验，但都没有设置。

第一次尝试

mockIJobLicensePathService
   .Setup(x => x.GetJobPathByFilters(It.IsAny<PathSearch>()))
   .Returns(Task.FromResult(It.IsAny<Task(IList<JobLicensePath>, PaginationModel)>()));

The type arguments for method 'Task.FromResult(TResult)' cannot be inferred from the usage. Try specifying the type arguments explicitly.

第二次尝试

mockIJobLicensePathService
    .Setup(x => x.GetJobPathByFilters(It.IsAny<PathSearch>()))
    .Returns(Task.FromResult(It.IsAny<IList<JobLicensePath>, PaginationModel>()>));

Using the generic method 'It.IsAny()' requires 1 type arguments

mockIJobLicensePathService
   .Setup(x => x.GetJobPathByFilters(It.IsAny<PathSearch>()))
   .Returns(Task.FromResult(It.IsAny<IList<JobLicensePath>>(), It.IsAny<PaginationModel>()));

No overload for method 'FromResult' takes 2 arguments

Answer 1

It.IsAny用于检查方法的参数。 你可以这样模拟它：

// arrange
(IList<JobLicensePath>, PaginationModel) result = (new List<JobLicensePath>(), new PaginationModel());
var mock = new Mock<IPathService>();
mock
    .Setup(s => s.GetJobPathByFilters(It.IsAny<PathSearch>()))
    .Returns(Task.FromResult(result));

Answer 2

您应该使用 Moq 的 ReturnsAsync 方法，如下所示。

// arrange

// Create the dummy object or use the existing one if already exists as part of your mock setup.
IList<JobLicensePath> jobLicensePath = new List<JobLicensePath>();
PaginationModel paginationModel = new PaginationModel();


mockIJobLicensePathService
      .Setup(x => x.GetJobPathByFilters(It.IsAny<PathSearch>()))
      .ReturnsAsync((jobLicensePath, paginationModel));

Answer 3

It class 的方法，如 Is 或 IsAny，只能在 Setup 方法内部使用。

它们帮助您指定您的模拟应该何时“触发”。

如果您的方法 returns 带有 Task 那么您有多种选择

ReturnAsync

var expectedJobLicensePaths = ...;
var expectedPaginationModel = ...;

mockIJobLicensePathService
   .Setup(x => x.GetJobPathByFilters(It.IsAny<PathSearch>()))
   .ReturnsAsync((expectedJobLicensePaths, expectedPaginationModel));

Result + Return

从 4.16 开始，您可以 rewrite the above setup to this

var expectedJobLicensePaths = ...;
var expectedPaginationModel = ...;

mockIJobLicensePathService
   .Setup(x => x.GetJobPathByFilters(It.IsAny<PathSearch>()).Result)
   .Returns((expectedJobLicensePaths, expectedPaginationModel));