Xunit为每个新测试创建新的Test类实例（使用WebDriver和C＃）

Question

有没有办法使用Xunit在使用Webdriver（Selenium）的同一浏览器中运行多个测试，目前xunit为每个新测试启动新的浏览器，下面是示例代码

public class Class1

{
    private FirefoxDriver driver;
    public Class1()
    {
         driver = new FirefoxDriver();
    }

    [Fact]
    public void Test()
    {
        driver.Navigate().GoToUrl("http://google.com");
        driver.FindElementById("gbqfq").SendKeys("Testing");
    }

    [Fact]
    public void Test2()
    {
        driver.Navigate().GoToUrl("http://google.com");
        driver.FindElementById("gbqfq").SendKeys("Testing again");
    }

}

Answer 1

虽然我不了解Selenium，但我确实知道xUnit.net为每个测试方法都创建了测试类的新实例，所以这很可能解释了为什么您看到了您要报告的行为：driver字段为每个测试方法重新初始化，因为构造函数每次都被调用。

为了重用单个FirefoxDriver实例，您可以使用xUnit.net的IUseFixture<T>接口：

public class Class1 : IUseFixture<FirefoxDriver>
{
    private FirefoxDriver driver;

    public void SetFixture(FirefoxDriver data)
    {
        driver = data;
    }

    [Fact]
    public void Test()
    {
        driver.Navigate().GoToUrl("http://google.com");
        driver.FindElementById("gbqfq").SendKeys("Testing");
    }

    [Fact]
    public void Test2()
    {
        driver.Navigate().GoToUrl("http://google.com");
        driver.FindElementById("gbqfq").SendKeys("Testing again");
    }    
}

Answer 2

经过一番调查后能够在这里找到解决方案，并将Firefox升级为IWebDriver ：：

   public class SampleFixture : IDisposable
   {
    private IWebDriver driver;
    public SampleFixture()
    {
        driver = new FirefoxDriver();
        Console.WriteLine("SampleFixture constructor called");

    }

    public IWebDriver InitiateDriver()
    {
        return driver;
    }

    public void Dispose()
    {
       // driver.Close();
        driver.Quit();
        Console.WriteLine("Disposing Fixture");
    }
}

public class Class1 : IUseFixture<SampleFixture>
{
    private IWebDriver driver;

    public void SetFixture(SampleFixture data)
    {
        driver = data.InitiateDriver();
    }

    [Fact]
    public void Test()
    {
        driver.Navigate().GoToUrl("http://google.com");
        driver.FindElement(By.Id("gbqfq")).SendKeys("Testing");
    }

    [Fact]
    public void Test2()
    {
        driver.Navigate().GoToUrl("http://google.com");
        driver.FindElement(By.Id("gbqfq")).SendKeys("Testing again");
    }
}

Answer 3

IUseFixture不再存在，似乎已被IClassFixture取代。但是我不能直接注入@Mark Seemann发表的FirefoxDriver：

public class DashboardCategoryBoxes : IClassFixture<FirefoxDriver> {
    IWebDriver driver;
    public DashboardCategoryBoxes(FirefoxDriver driver) {
        //this.driver = wrapper.Driver;
        this.driver = driver;
    }
}

此抛出错误
 System.AggregateException : One or more errors occurred. (Class fixture type 'OpenQA.Selenium.Firefox.FirefoxDriver' may only define a single public constructor.) (The following constructor parameters did not have matching fixture data: FirefoxDriver driver)
    ---- Class fixture type 'OpenQA.Selenium.Firefox.FirefoxDriver' may only define a single public constructor.
    ---- The following constructor parameters did not have matching fixture data: FirefoxDriver driver

作为一种解决方法，我们可以创建一些没有构造函数的包装器类
public class FirefoxWrapper {
    FirefoxDriver driver = new FirefoxDriver();
    public FirefoxWrapper Driver {
        get { return driver; }
    }
}

并从那里获取驱动程序
public class DashboardCategoryBoxes : IClassFixture<FirefoxWrapper> {
    IWebDriver driver;
    public DashboardCategoryBoxes(FirefoxWrapper wrapper) {
        driver = wrapper.Driver;
    }
}