我需要为以下类的InvokeAsync方法创建一个单元测试。它所做的只是调用同一类中的私有方法,其中包括复杂的逻辑分支和 Web 服务调用。但是单元测试只为公共方法编写。那么在这种情况下我应该怎么做呢?我应该在这里测试什么?任何建议将不胜感激。
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.
}
}
如果你的测试框架支持它(MsTest支持),你可以async
声明你的测试方法,并从那里调用该方法。我会使用模拟框架(如 Rhino Mocks)来模拟 Web 服务,这样你就不需要依赖实际的 Web 服务。
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);
}