NUnit Specflow 如何为所有测试共享一个类实例 [英] NUnit Specflow how to share a class instance for all tests

问题描述

我将 Specflow 与 NUnit 和 Selenium 一起使用，并希望在所有测试中共享驱动程序实例.我可以使用 FeatureContext 做到这一点，但在所有测试中都看不到任何内容.我知道这可能不是正确的方法，但我想知道是否有办法.

I am using Specflow with NUnit and Selenium and want to share instance of driver across all tests. I can do do this up to feature level with FeatureContext but can't see anything for all tests. I am aware that this is probably not the right way to go but I want to know if there is a way.

请帮忙举例.

谢谢

推荐答案

有几种方法可以做到这一点.此页面

There are a few ways to do this. Most are covered on this page

我个人可能会做的是定义一个 SeleniumContext 类并在我所有的 Step 类构造函数中需要这个类，然后告诉 SpecFlow 的 IOC 在每个场景中使用相同的实例:

What I personally would probably do is define a SeleniumContext class and require this class in all my Step class constructors, then tell SpecFlow's IOC to use the same instance in every scenario:

首先创建类来保存 selenium 驱动程序实例

First create the class to hold the selenium driver instance

public class SeleniumContext
{
     public SeleniumContext()
     {
          //create the selenium context
          WebDriver = new ...create the flavour of web driver you want
     }

     public IWebDriver WebDriver{get; private set;} 
}

然后设置 IOC 每次返回相同的实例

then setup the IOC to return the same instance every time

[Binding]
public class BeforeAllTests
{
    private readonly IObjectContainer objectContainer;
    private static SeleniumContext seleniumContext ;

    public BeforeAllTests(IObjectContainer container)
    {
        this.objectContainer = container;
    }

    [BeforeTestRun]
    public static void RunBeforeAllTests()
    {
        seleniumContext = new SeleniumContext();
     }

    [BeforeScenario]
    public void RunBeforeScenario()
    {            
        objectContainer.RegisterInstanceAs<SeleniumContext>(seleniumContext );
    }
}

然后确保您的步骤类始终在其构造函数中询问上下文(您需要在您拥有的每个步骤类中都这样做)

Then ensure your step classes always ask for the context in their constructors (you need to do this in every step class you have)

[Bindings]
public class MySteps
{
    private SeleniumContext seleniumContext;

    public MyClass(SeleniumContext seleniumContext)
    {
         //save the context so you can use it in your tests
         this.seleniumContext = seleniumContext;
    }

    //then just use the seleniumContext.WebDriver in your tests
}

或者，如果您已经将实例存储在功能上下文中，那么您可以使用 BeforeFeature 钩子来保存相同的实例:

alternatively if you are already storing the instance in the feature context then you can just use the BeforeFeature hook to save the same instance:

[Binding]
public class BeforeAllTests
{
    private static WebDriver webDriver;

    [BeforeTestRun]
    public static void RunBeforeAllTests()
    {
        webDriver = new WebDriver();
     }

    [BeforeFeature]
    public static void RunBeforeFeature()
    {
        FeatureContext["WebDriver"] = webDriver;
     }

}

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