在 xUnit.net 中等待测试设置代码中的任务? [英] Await Tasks in Test Setup Code in xUnit.net?

问题描述

确切的情况是我正在使用 Protractor.NET(AngularJS 的 Protractor E2E 框架的 .NET 端口)进行 E2E 测试，我想发出一些 Web 请求(和 API -- System.Net.Http.HttpClient -- 有所有的 Async/Task 方法)在我执行/断言之前安排我的测试，只有我需要为几个测试做同样的安排.

The exact situation is I'm doing E2E tests with Protractor.NET (.NET port of AngularJS's Protractor E2E framework) and I would like to make some web requests (and the API -- System.Net.Http.HttpClient -- has all Async/Task methods) to Arrange my test before I Act/Assert, only I need to do this same Arrange-ing for several tests.

我使用 xUnit.net 作为我的测试运行器，他们使用接口 (IUseFixture) 来处理每个夹具的设置代码.如果有一个 IAsyncUseFixture 有一个 Task SetFixtureAsync(T t); 或其他东西，那就太好了.我不认为这样的事情存在.此外，我认为构造函数也不能使用 await，并且构造函数是在 xUnit.net 中每次测试执行相同代码块的唯一其他方法.

I'm using xUnit.net as my test runner they use an interface (IUseFixture<T>) for per-fixture setup code. It would be nice if there was a IAsyncUseFixture<T> that had a Task SetFixtureAsync(T t); or something. I don't think such a thing exists. Additionally I don't think constructors can use await either, and constructors are the only other way to execute the same block of code per-test in xUnit.net.

我有哪些选择?.Result?这不是不好的做法(死锁)吗?

What are my options? .Result? Isn't that bad practice (deadlock)?

推荐答案

xUnit 有一个 IAsyncLifetime 接口用于异步设置/拆卸.您需要实现的方法是Task InitializeAsync() 和Task DisposeAsync().

xUnit has an IAsyncLifetime interface for async setup/teardown. The methods you need to implement are Task InitializeAsync() and Task DisposeAsync().

InitializeAsync 在类创建后立即调用，然后才使用.

InitializeAsync is called immediately after the class has been created, before it is used.

DisposeAsync 在 IDisposable.Dispose 之前调用，如果该类也实现了 IDisposable.

DisposeAsync is called just before IDisposable.Dispose if the class also implements IDisposable.

例如

public class MyTestFixture : IAsyncLifetime
{
    private string someState;

    public async Task InitializeAsync()
    {
        await Task.Run(() => someState = "Hello");
    }

    public Task DisposeAsync()
    {
        return Task.CompletedTask;
    }

    [Fact]
    public void TestFoo()
    {
        Assert.Equal("Hello", someState);
    }
}

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