Selenium问题：Chrome、Firefox浏览器未按预期关闭

问题代码 #

public class MS848Steps {
    WebDriver driver;

    @Given("Website is live and available")
    public void website_is_live_and_available() {
        System.out.println("Website is live and available!");
    }

    @When("Website works on Firefox")
    public void website_works_on_firefox() {
        driver = new FirefoxDriver();
        driver.get("https://demowebshop.tricentis.com/");
        System.out.println("Website works on Firefox!");
    }

    @And("Website works on Chrome")
    public void website_works_on_chrome() {

        ChromeOptions options = new ChromeOptions();
        options.addArguments("--remote-allow-origins=*");

        driver = new ChromeDriver(options);
        driver.get("https://demowebshop.tricentis.com/");
        System.out.println("Website works on Chrome!");
    }

    @And("Website works on Edge")
    public void website_works_on_edge() {
        driver = new EdgeDriver();
        driver.get("https://demowebshop.tricentis.com/");
        System.out.println("Website works on Edge!");
    }

    @Then("Website works on every browser")
    public void website_works_on_every_browser() {
        System.out.println("Website works on every Browsers!");
    }
    @After
    public void tearDown() {
        if (driver != null) {
            driver.quit();
        }
    }
}

问题描述 #

执行上述代码后，Chrome和Firefox浏览器始终无法自动关闭，手动在每个浏览器启动步骤中添加driver.close()或driver.quit()也无效果。

原因分析 #

核心问题是浏览器实例引用丢失：每次启动新浏览器时，driver变量会被重新赋值，覆盖掉之前的Firefox/Chrome实例引用。@After方法只会关闭最后赋值的Edge浏览器，之前的Chrome和Firefox实例因为没有被引用，无法被quit()调用，导致进程残留。

解决方案 #

方案1：保存所有浏览器实例，统一关闭 #

将单个driver变量改为集合，保存所有启动的浏览器实例，在@After中遍历逐个关闭：

public class MS848Steps {
    List<WebDriver> drivers = new ArrayList<>();

    @Given("Website is live and available")
    public void website_is_live_and_available() {
        System.out.println("Website is live and available!");
    }

    @When("Website works on Firefox")
    public void website_works_on_firefox() {
        WebDriver firefoxDriver = new FirefoxDriver();
        firefoxDriver.get("https://demowebshop.tricentis.com/");
        drivers.add(firefoxDriver);
        System.out.println("Website works on Firefox!");
    }

    @And("Website works on Chrome")
    public void website_works_on_chrome() {
        ChromeOptions options = new ChromeOptions();
        options.addArguments("--remote-allow-origins=*");

        WebDriver chromeDriver = new ChromeDriver(options);
        chromeDriver.get("https://demowebshop.tricentis.com/");
        drivers.add(chromeDriver);
        System.out.println("Website works on Chrome!");
    }

    @And("Website works on Edge")
    public void website_works_on_edge() {
        WebDriver edgeDriver = new EdgeDriver();
        edgeDriver.get("https://demowebshop.tricentis.com/");
        drivers.add(edgeDriver);
        System.out.println("Website works on Edge!");
    }

    @Then("Website works on every browser")
    public void website_works_on_every_browser() {
        System.out.println("Website works on every Browsers!");
    }

    @After
    public void tearDown() {
        for (WebDriver driver : drivers) {
            if (driver != null) {
                try {
                    driver.quit();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }
        drivers.clear();
    }
}

方案2：单个浏览器验证后立即关闭（适合无需多浏览器同时打开的场景） #

在每个浏览器步骤中，用局部变量保存实例，通过try-finally确保无论步骤是否成功，都关闭当前浏览器：

@When("Website works on Firefox")
public void website_works_on_firefox() {
    WebDriver driver = new FirefoxDriver();
    try {
        driver.get("https://demowebshop.tricentis.com/");
        System.out.println("Website works on Firefox!");
    } finally {
        if (driver != null) {
            driver.quit();
        }
    }
}

@And("Website works on Chrome")
public void website_works_on_chrome() {
    ChromeOptions options = new ChromeOptions();
    options.addArguments("--remote-allow-origins=*");

    WebDriver driver = new ChromeDriver(options);
    try {
        driver.get("https://demowebshop.tricentis.com/");
        System.out.println("Website works on Chrome!");
    } finally {
        if (driver != null) {
            driver.quit();
        }
    }
}

// Edge步骤同理修改

额外注意事项 #

• 确保Selenium版本与浏览器驱动（ChromeDriver/GeckoDriver/EdgeDriver）、浏览器版本完全匹配，版本不兼容也会导致quit()无法正常终止进程。
• 若使用Cucumber并行执行，需保证线程安全，每个线程维护独立的浏览器实例集合。

内容的提问来源于stack exchange，提问作者Joel Hochbein