Selenium、TestNg 并行运行未按预期工作

问题描述

我有 3 个测试类，其中包含多个我想并行运行的测试方法。我正在使用 ThreadLocal 来隔离每个线程的 webdriver 实例。当我以顺序方式运行测试时，一切看起来都很好，但是当我并行运行它们时会出现问题。下面是我的套件文件

<!DOCTYPE suite SYSTEM "http://testng.org/testng-1.0.dtd">
<suite name="platform" parallel="classes" thread-count="5">
    <test name="platform">
        <classes>
            <class name="com.sat.platform.mobile.PlatformMobileIdCaptureMonitoringWf11"></class>
            <class name="com.sat.platform.mobile.PlatformMobileIdVerificationMonitoringWf2"></class>
            <class name="com.sat.platform.mobile.PlatformMobileIdandIVMonitoringWf3"></class>
            <class name="com.sat.platform.mobile.PlatformMobileLivenessMonitoringWf6"></class>
            <class name="com.sat.platform.mixed.PlatformMixedIdSimilarityMonitoringWf2and5"></class>
        </classes>
    </test>
</suite>

我正在 BrowserClient.java 中的 @BeforeClass 中初始化 Webdriver，如下所示。

    protected WebDriver driver;
    private static int implicitWaitTime;
    private static int explicitWaitTime;
    private static int fluentWaitTime;
    private static int pollingTime;
    protected static WebDriverWait explicitWait;
    protected static Wait<WebDriver> fluentWait;
    private static String browser;
    protected static Browsers browsers;

    static {
        Properties prop = new Properties();
        ClassLoader loader = Thread.currentThread().getContextClassLoader();
        InputStream stream = loader.getResourceAsStream("browser.properties");
        try {
            prop.load(stream);
        } catch (IOException e) {
        }
        implicitWaitTime = Integer.parseInt(prop.getProperty("browser.implicit.wait.timeout"));
        explicitWaitTime = Integer.parseInt(prop.getProperty("browser.explicit.wait.timeout"));
        fluentWaitTime = Integer.parseInt(prop.getProperty("browser.fluent.wait.timeout"));
        pollingTime = Integer.parseInt(prop.getProperty("browser.wait.polling.time"));
        browser = System.getProperty("browser");
    }

    @BeforeClass
    public void initializeEnv() throws MalformedURLException {
        driver = BrowserFactory.createInstance(browser,implicitWaitTime);
        DriverFactory.getInstance().setDriver(driver);
        driver = DriverFactory.getInstance().getDriver();
        explicitWait = new WebDriverWait(driver,explicitWaitTime);
        fluentWait = new FluentWait(driver).withTimeout(Duration.of(fluentWaitTime,SECONDS))
                .pollingEvery(Duration.of(pollingTime,SECONDS))
                .ignoring(NoSuchElementException.class);
    }

这里使用的类，即 BrowserFactory.java

public static WebDriver createInstance(String browser,int implicitWaitTime) throws MalformedURLException {
        WebDriver driver = null;
        Browsers browserEnum = Browsers.valueOf(browser);
        String testVideo = ImageProcessingUtils.getAbsolutePath("digital_copy.mjpeg",false);

        switch (browserEnum) {
            case chrome:
                ChromeOptions options = new ChromeOptions();
                options.addArguments("--use-fake-ui-for-media-stream","--use-fake-device-for-media-stream","--use-file-for-fake-video-capture=" + testVideo,"--start-maximized");
                driver = new ChromeDriver(options);
                break;

            case firefox:
                FirefoxProfile firefoxProfile = new FirefoxProfile();
                firefoxProfile.setPreference("media.navigator.permission.disabled",true);
                firefoxProfile.setPreference("media.navigator.streams.fake",true);
                firefoxProfile .setPreference("browser.private.browsing.autostart",false);
                FirefoxOptions firefoxOptions = new FirefoxOptions();
                firefoxOptions.setProfile(firefoxProfile);
                driver = new FirefoxDriver(firefoxOptions);
                break;
     }
}

DriverFactory.java

public class DriverFactory {

    private static DriverFactory instance = new DriverFactory();
    private static ThreadLocal<WebDriver> driver = new ThreadLocal<>();
    private static List<WebDriver> driversList = new ArrayList();

    private DriverFactory(){

    }

    public static DriverFactory getInstance() {
        return instance;
    }

    public WebDriver getDriver(){
        WebDriver localDriver = driver.get();
        driversList.add(localDriver);
        return localDriver;
    }

    public void setDriver(WebDriver driver){
        this.driver.set(driver);
    }

    public static void removeDriver(){
        for(WebDriver driver : driversList) {
            driver.quit();
        }
    }
}

我的测试类扩展了 BrowserClient.java，我可以在其中直接使用 驱动程序。所有 3 个测试类中的常用方法之一是 merchant_gets_oauth_token()，如下所示。问题是当测试套件运行时，3 个 firefox 浏览器并行打开，并且所有浏览器都导航到登录页面，但只有 1 个，有时 2 个测试通过，而第 3 个测试失败（无法登录）。

    @Test
    public void merchant_gets_oauth_token() {
        OAuth2Client client = new OAuth2Client();
        String loginUrl = DslConfigFactory.getEnvConfig("portal.customer.url");
        driver.get(loginUrl);
        CustomerPortalLoginPage loginPage = new CustomerPortalLoginPage(driver);
        log.info("----------merchant logging to customer portal to get oauth token----------");
        loginPage.login(merchantUser.getEmail(),merchantUser.getPassword());
        CustomerPortalHomePage homePage = new CustomerPortalHomePage(driver);
        homePage.clickOnSettings();
        CustomerPortalSettingsPage settingsPage = new CustomerPortalSettingsPage(driver);
        settingsPage.clickOnApiCredentials();
        CustomerPortalApiCredentialsPage apiCredentialsPage = new CustomerPortalApiCredentialsPage(driver);
        clientCredentials = apiCredentialsPage.getOauth2ClientCredentials();
        oauthToken = client.getOauthToken(clientCredentials.get("token"),clientCredentials.get("secret"));
    }

我一直在为这个问题苦苦挣扎，并且在没有帮助的情况下查找了大量在线资源。也许这里有人能够做 RCA。提前致谢！！

解决方法

public static void removeDriver(){
        for(WebDriver driver : driversList) {
            driver.quit();
        }
    }

Here,replace driver.quit() with driver.close().
driver.close() method it will close only current driver. driver.close() closes all drivers. 

When first instance executes removeDriver(),it will closes all windows/drivers. Then next instance try to execute removeDriver(),there driver is not available because it is already closed by previous instance of driver.so you get error.