Selenium 2和JUnit4：如何捕获截图的异常？ [英] Selenium 2 and JUnit4: How to capture screenshot on exception?

问题描述

解决方案

_{注意：这个答案可能已经过时了。答案是基于Selenium 2.15}

使用 TestWatcher 执行技巧（单元测试必须在 BaseTest 之后扩展）：

  public abstract class BaseTest {
 // ... 
 protected WebDriver driver; 
 
 
 @Rule 
 public TestRule testWatcher = new TestWatcher（）{
 @Override 
 public void starts（Description desc）{
 LOG .info（启动浏览器...）; 
 driver = Utils.getFirefoxDriver（）; 
} 
 
 @Override 
 public void finished（Description desc）{
 LOG.info（Quitting driver ...）; 
 driver.quit（）; 
} 
 
 @Override 
 public void failed（Throwable e，Description d）{
 LOG.debug（Creating screenshot ...）; 
文件scrFile =（（TakesScreenshot）驱动程序）.getScreenshotAs（
 OutputType.FILE）; 
 String scrFilename =Screenshot.png; 
文件outputFile =新文件（SCREEN_SHOTS_RESULTS_PATH，scrFilename）; 
 LOG.info（scrFilename +截图创建）; 
 try {
 org。apache。commons。io.FileUtils.copyFile（scrFile，outputFile）; 
} catch（IOException ioe）{
 LOG.error（异常复制截图后出错，ioe）; 
} 
} 
}; 
} 
  

---

注意

Utils.getFirefoxDriver（）返回自定义的 WebDriver 。如下所示：

  import org.openqa.selenium.WebDriver; 
 import org.openqa.selenium.firefox.FirefoxBinary; 
 import org.openqa.selenium.firefox.FirefoxDriver; 
 import org.openqa.selenium.firefox.FirefoxProfile; 
 
 public class Utils {
 // ... 
 public static WebDriver getFirefoxDriver（）{
 FirefoxProfile firefoxProfile = new FirefoxProfile（）; 
 
 //个人资料定制。例如：
 // firefoxProfile.addExtension（firebug-1.8.4-fx.xpi）; 
 // firefoxProfile.setPreference（extensions.firebug.currentVersion，1.8.4）; 
 
 FirefoxBinary firefox = new FirefoxBinary（）; 
 
 // Firefox自定义。例如：
 // firefox.setEnvironmentProperty（DISPLAY，显示）; 
 
 WebDriver驱动程序=新的FirefoxDriver（firefox，firefoxProfile）; 
 
 // WebDriver自定义。例如：
 // driver.manage（）.timeouts（）。implicitlyWait（SHORT_TIMEOUT_S，Tim​​eUnit.SECONDS）; 
返回驱动; 
} 
} 
  

I want to capture a screenshot only upon unexpected exception.

解决方案

_{Note.- This answer could be outdated. The answer is based on Selenium 2.15}

Using TestWatcher does the trick (the unit test must extend following BaseTest):

public abstract class BaseTest {
// ...
protected WebDriver driver;


@Rule
public TestRule testWatcher = new TestWatcher() {
    @Override
    public void starting(Description desc) {
        LOG.info("Launching browser...");
        driver = Utils.getFirefoxDriver();
    }

    @Override
    public void finished(Description desc) {
        LOG.info("Quitting driver...");
        driver.quit();
    }

    @Override
    public void failed(Throwable e, Description d) {
        LOG.debug("Creating screenshot...");
        File scrFile = ((TakesScreenshot) driver).getScreenshotAs(
                OutputType.FILE);
        String scrFilename = "Screenshot.png";
        File outputFile = new File(SCREEN_SHOTS_RESULTS_PATH, scrFilename);
        LOG.info(scrFilename + " screenshot created.");
        try {
            org.​apache.​commons.​io.FileUtils.copyFile(scrFile, outputFile);
        } catch (IOException ioe) {
            LOG.error("Error copying screenshot after exception.", ioe);
        }
    }
};
}

---

Note

Utils.getFirefoxDriver() returns a customized WebDriver. Something like:

import org.openqa.selenium.WebDriver;
import org.openqa.selenium.firefox.FirefoxBinary;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.openqa.selenium.firefox.FirefoxProfile;

public class Utils {
    // ...
    public static WebDriver getFirefoxDriver() {
        FirefoxProfile firefoxProfile = new FirefoxProfile();

        // Profile customization. For example:
        // firefoxProfile.addExtension("firebug-1.8.4-fx.xpi");
        // firefoxProfile.setPreference("extensions.firebug.currentVersion","1.8.4");

        FirefoxBinary firefox = new FirefoxBinary();

        // Firefox customization. For example:
        // firefox.setEnvironmentProperty("DISPLAY", display);

        WebDriver driver = new FirefoxDriver(firefox, firefoxProfile);

        // WebDriver customizations. For example:
        // driver.manage().timeouts().implicitlyWait(SHORT_TIMEOUT_S, TimeUnit.SECONDS);
        return driver;
    }
}

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