使用Moq在单元测试中模拟执行延迟

using Moq;
using System;
using System.Threading.Tasks;
using Xunit;

public interface IService
{
    Task<string> GetDataAsync();
}

public class MyClass
{
    private readonly IService _service;

    public MyClass(IService service)
    {
        _service = service;
    }

    public async Task<string> FetchDataAsync()
    {
        return await _service.GetDataAsync();
    }
}

public class MyClassTests
{
    [Fact]
    public async Task FetchDataAsync_ShouldReturnDelayedData()
    {
        // Arrange
        var mockService = new Mock<IService>();
        mockService.Setup(s => s.GetDataAsync()).ReturnsAsync("Mocked Data").Wait(1000); // 模拟1秒延迟

        var myClass = new MyClass(mockService.Object);

        // Act
        var result = await myClass.FetchDataAsync();

        // Assert
        Assert.Equal("Mocked Data", result);
    }
}