单元测试与任务℃的异步方法;布尔＆GT;返回类型 [英] Unit testing an async method with Task<bool> return type

问题描述

我需要为下面的类的 InvokeAsync 方法单元测试。什么它只是做的是调用同一个类，其中包括复杂的逻辑分支和Web服务调用的私有方法。但是，单元测试只针对公共方法写的。所以，我应该在这种情况下怎么办？我应该在这里考的？任何建议将不胜AP preciated。

 公共类MyCustomHandler
{
    私人只读ILogger _logger;
    私人只读HttpClient的_httpClient;    公共MyCustomHandler（HttpClient的客户端，ILogger记录仪）
    {
        _httpClient = HttpClient的;
        _logger =记录仪;
    }    公共覆盖异步任务＆LT;布尔＆GT; InvokeAsync（）
    {
        返回等待InvokeReplyPathAsync（）;
    }    私人异步任务＆LT;布尔＆GT; InvokeReplyPathAsync（）
    {
        // code复杂的逻辑分支的地段和调用Web服务。
    }
}
 

解决方案

如果您的测试框架支持它（MSTest的做），你可以宣布你的测试方法异步并调用从那里方法。我使用的是模拟框架，如犀牛嘲笑嘲笑的Web服务，所以你不需要依赖于实际的Web服务。

 公共接口IWebService
{
    任务＆LT;布尔＆GT; GetDataAsync（）;
}[识别TestClass]
公共类AsyncTests
{
    [测试方法]
    公共异步无效测试（）
    {
        VAR的WebService = MockRepository.GenerateStub＆LT; IWebService＆GT;（）;
        webService.Expect（X =＆GT; x.GetDataAsync（）），收益（新任务＆LT;布尔＆GT;（（）=＆GT; FALSE））;        VAR将myHandler =新MyCustomHandler（web服务）;
        布尔结果=等待myHandler.InvokeAsync（）;
        Assert.IsFalse（结果）;
    }
}[测试方法]
公共异步无效TestWebServiceException（）
{
    VAR的WebService = MockRepository.GenerateStub＆LT; IWebService＆GT;（）;
    webService.Expect（X =＆GT; x.GetDataAsync（））。抛出（新引发WebException（服务不可用））;    VAR将myHandler =新MyCustomHandler（web服务）;
    布尔结果=等待myHandler.InvokeAsync（）;
    Assert.IsFalse（结果）;
 }
 

I need to create a unit test for the following class's InvokeAsync method. What it merely does is calling a private method in the same class which includes complex logical branches and web service calls. But the unit test are written only for the public methods. So what should I do in this scenario? What should I test in here? Any suggestions would be greatly appreciated.

public class MyCustomHandler
{
    private readonly ILogger _logger;
    private readonly HttpClient _httpClient;

    public MyCustomHandler(HttpClient client, ILogger logger)
    {
        _httpClient = httpClient;
        _logger = logger;
    }

    public override async Task<bool> InvokeAsync()
    {
        return await InvokeReplyPathAsync();
    }

    private async Task<bool> InvokeReplyPathAsync()
    {
        // Lot of code with complex logical branches and calling web services.              
    }
}

解决方案

If your testing framework supports it (MsTest does) you can declare your test method async and call the method from there. I'd mock the web services using a mock framework such as Rhino Mocks so you don't need to depend on the actual web service.

public interface IWebService
{
    Task<bool> GetDataAsync();
}

[TestClass]
public class AsyncTests
{
    [TestMethod]
    public async void Test()
    {
        var webService = MockRepository.GenerateStub<IWebService>();
        webService.Expect(x => x.GetDataAsync()).Return(new Task<bool>(() => false));

        var myHandler = new MyCustomHandler(webService);
        bool result = await myHandler.InvokeAsync();
        Assert.IsFalse(result);
    }
}

[TestMethod]
public async void TestWebServiceException()
{
    var webService = MockRepository.GenerateStub<IWebService>();
    webService.Expect(x => x.GetDataAsync()).Throw(new WebException("Service unavailable"));

    var myHandler = new MyCustomHandler(webService);
    bool result = await myHandler.InvokeAsync();
    Assert.IsFalse(result);
 }

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