如何在ASP.NET核心测试中使用存根/模拟服务

// 定义接口
public interface IDataService
{
    string GetData();
}

// 创建存根/模拟服务
public class StubDataService : IDataService
{
    public string GetData()
    {
        return "Mock data";
    }
}

// 被测试的类
public class MyService
{
    private readonly IDataService _dataService;

    public MyService(IDataService dataService)
    {
        _dataService = dataService;
    }

    public string ProcessData()
    {
        var data = _dataService.GetData();
        // 处理数据的逻辑
        return "Processed data";
    }
}

// 测试代码
public class MyServiceTests
{
    [Fact]
    public void ProcessData_ShouldReturnProcessedData()
    {
        // 创建存根/模拟服务
        var stubDataService = new StubDataService();

        // 创建DI容器，并注册存根/模拟服务
        var serviceProvider = new ServiceCollection()
            .AddSingleton<IDataService>(stubDataService)
            .BuildServiceProvider();

        // 从DI容器中解析被测试的类
        var myService = serviceProvider.GetService<MyService>();

        // 执行被测试的方法
        var result = myService.ProcessData();

        // 验证结果是否符合预期
        Assert.Equal("Processed data", result);
    }
}