c# – 如何模拟返回Task>的方法？

我正在尝试对返回任务>的方法进行单元测试：

void Main()
{
    var mockRepo = new Mock<IRepository>();
    mockRepo.Setup(x => x.GetAll()).Returns(new List<MyModel>() { new MyModel { Name = "Test" } });  // works

    mockRepo.Setup(x => x.GetAllAsync()).Returns(Task.Fromresult(new List<MyModel>() { new MyModel { Name = "Test" } }));  // error

    var result = mockRepo.Object.GetAll();
    result.Dump();
}

public interface IRepository
{
    Task<IList<MyModel>> GetAllAsync();
    IList<MyModel> GetAll();
}

public class MyModel
{
    public string Name { get; set; }
}

但Task返回方法会生成编译器错误：

CS1503 Argument 1: cannot convert from
‘System.Threading.Tasks.Task<System.Collections.Generic.List<UserQuery.MyModel>’
to
‘System.Threading.Tasks.Task<System.Collections.Generic.IList<UserQuery.MyModel>’

我究竟做错了什么？

解决方法

您可以使用ReturnsAync方法：

IList<MyModel> expected = new List<MyModel>() { new MyModel { Name = "Test" }};
mockRepo.Setup(x => x.GetAll()).ReturnsAsync(expected);