Firefox驱动程序发生故障并获取无法访问的错误

Question

正在尝试使用我放在一起的dart Web应用程序进行一些测试。我按照标准运行了pub build，然后做了一个简单的python -m SimpleHTTPServer来启动服务器。真棒。可以在两个浏览器上访问localhost:8000。

然后我进入我的Java应用程序来运行一些Selenium测试。简单的运行应用程序。 Chrome成功，但Firefox失败。我已经针对其他具有不同标题的页面进行了测试。它工作得很好，并通过了两个测试，但与此似乎不起作用。

当代码执行时，我看到它打开两个浏览器并相应地导航。

Java代码：

@Test 
public void testWithChrome(){ 
    WebDriver driver = new ChromeDriver(DesiredCapabilities.chrome()); 
    testSuite(driver); 
} 

@Test 
public void testWithFirefox(){ 
    WebDriver driver = new FirefoxDriver(DesiredCapabilities.firefox()); 
    testSuite(driver); 
} 

public void testSuite(WebDriver driver){ 
    driver.navigate().to("http://localhost:8000/web/"); 
    Assert.assertTrue("title should start with Polymer Todo App", 
      driver.getTitle().startsWith("Polymer Todo App")); 

    System.out.printf("This is a Test: '%s'\n", driver.getTitle()); 
    System.out.println(driver.getTitle().startsWith("Polymer Todo App")); 

    driver.close(); 
    driver.quit(); 
} 

你可以看到它是非常简单的。你也可以看到我有一些打印语句。这些打印语句在控制台输出中表示。我只是不知道为什么，我发现了一个中止和UnreachableBrowserException

错误：

Sep 29, 2016 10:07:44 AM org.openqa.selenium.remote.ProtocolHandshake createSession 
INFO: Attempting bi-dialect session, assuming Postel's Law holds true on the remote end 
1475158066440 Marionette INFO Listening on port 55006 
Sep 29, 2016 10:07:51 AM org.openqa.selenium.remote.ProtocolHandshake createSession 
INFO: Detected dialect: W3C 
JavaScript warning: https://normandy.cdn.mozilla.net/static/bundles/selfrepair-c889f52c56e4df3156a1.f5e450e97071.js, line 7: mutating the [[Prototype]] of an object will cause your code to run very slowly; instead create the object with the correct initial [[Prototype]] value using Object.create 
JavaScript warning: http://localhost:8000/web/, line 308: mutating the [[Prototype]] of an object will cause your code to run very slowly; instead create the object with the correct initial [[Prototype]] value using Object.create 
JavaScript warning: http://localhost:8000/web/index.bootstrap.initialize.dart.js, line 1: unreachable code after return statement 
JavaScript warning: http://localhost:8000/web/index.bootstrap.initialize.dart.js line 3207 > Function, line 1: unreachable code after return statement 
JavaScript warning: http://localhost:8000/web/index.bootstrap.initialize.dart.js, line 1: unreachable code after return statement 
JavaScript warning: http://localhost:8000/web/index.bootstrap.initialize.dart.js line 3213 > Function, line 1: unreachable code after return statement 
JavaScript warning: http://localhost:8000/web/index.bootstrap.initialize.dart.js, line 1: unreachable code after return statement 
JavaScript warning: http://localhost:8000/web/index.bootstrap.initialize.dart.js line 3213 > Function, line 1: unreachable code after return statement 
JavaScript warning: http://localhost:8000/web/index.bootstrap.initialize.dart.js, line 1: unreachable code after return statement 
JavaScript warning: http://localhost:8000/web/index.bootstrap.initialize.dart.js line 3213 > Function, line 1: unreachable code after return statement 
JavaScript warning: http://localhost:8000/web/index.bootstrap.initialize.dart.js, line 1: unreachable code after return statement 
JavaScript warning: http://localhost:8000/web/index.bootstrap.initialize.dart.js, line 1: unreachable code after return statement 
JavaScript warning: http://localhost:8000/web/index.bootstrap.initialize.dart.js, line 1: unreachable code after return statement 
JavaScript warning: http://localhost:8000/web/index.bootstrap.initialize.dart.js line 3213 > Function, line 1: unreachable code after return statement 
JavaScript warning: http://localhost:8000/web/index.bootstrap.initialize.dart.js, line 1: unreachable code after return statement 
JavaScript warning: http://localhost:8000/web/index.bootstrap.initialize.dart.js line 3213 > Function, line 1: unreachable code after return statement 
JavaScript warning: http://localhost:8000/web/index.bootstrap.initialize.dart.js, line 1: unreachable code after return statement 
JavaScript warning: http://localhost:8000/web/index.bootstrap.initialize.dart.js line 3213 > Function, line 1: unreachable code after return statement 
JavaScript warning: http://localhost:8000/web/index.bootstrap.initialize.dart.js, line 1: unreachable code after return statement 
JavaScript warning: http://localhost:8000/web/index.bootstrap.initialize.dart.js line 3213 > Function, line 1: unreachable code after return statement 
This is a Test: 'Polymer Todo App' 
true 
[Child 7828] ###!!! ABORT: Aborting on channel error.: file c:/builds/moz2_slave/m-rel-w32-00000000000000000000/build/src/ipc/glue/MessageChannel.cpp, line 2027 

org.openqa.selenium.remote.UnreachableBrowserException: Error communicating with the remote browser. It may have died. 
Build info: version: 'unknown', revision: 'c7b525d', time: '2016-09-01 14:57:44 -0700' 
System info: host: 'CHI-CS-55DXX52', ip: '10.60.68.15', os.name: 'Windows 7', os.arch: 'amd64', os.version: '6.1', java.version: '1.8.0_77' 
Driver info: driver.version: RemoteWebDriver 
Capabilities [{rotatable=false, raisesAccessibilityExceptions=false, appBuildId=20160623154057, version=, platform=XP, proxy={}, command_id=1, specificationLevel=0, acceptSslCerts=false, browserVersion=47.0.1, platformVersion=6.1, XULappId={ec8030f7-c20a-464f-9b0e-13a3a9e97384}, browserName=Firefox, takesScreenshot=true, takesElementScreenshot=true, platformName=Windows_NT, device=desktop}] 
Session ID: 7431bbcb-b619-48dc-b4ca-ccc14eef1ce8 

    at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:618) 
    at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:654) 
    at org.openqa.selenium.remote.RemoteWebDriver.quit(RemoteWebDriver.java:493) 
    at com.polymerdart.webdriver.MyFirstTest.testSuite(MyFirstTest.java:36) 
    at com.polymerdart.webdriver.MyFirstTest.testWithFirefox(MyFirstTest.java:24) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    at java.lang.reflect.Method.invoke(Method.java:498) 
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50) 
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) 
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47) 
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17) 
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325) 
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78) 
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57) 
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290) 
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71) 
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288) 
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58) 
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268) 
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363) 
    at org.junit.runner.JUnitCore.run(JUnitCore.java:137) 
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:117) 
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:42) 
    at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:262) 
    at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:84) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    at java.lang.reflect.Method.invoke(Method.java:498) 
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147) 
Caused by: java.lang.IllegalStateException: UnixUtils may not be used on Windows 
    at org.openqa.selenium.os.ProcessUtils.getProcessId(ProcessUtils.java:188) 
    at org.openqa.selenium.os.UnixProcess$SeleniumWatchDog.getPID(UnixProcess.java:222) 
    at org.openqa.selenium.os.UnixProcess$SeleniumWatchDog.access$300(UnixProcess.java:201) 
    at org.openqa.selenium.os.UnixProcess.destroy(UnixProcess.java:132) 
    at org.openqa.selenium.os.CommandLine.destroy(CommandLine.java:155) 
    at org.openqa.selenium.remote.service.DriverService.stop(DriverService.java:196) 
    at org.openqa.selenium.remote.service.DriverCommandExecutor.execute(DriverCommandExecutor.java:94) 
    at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:597) 
    ... 31 more 

Answer 1

要解决这个问题，我做了以下内容：

static Map<String, WebDriver> driverMap = new HashMap<String,WebDriver>(); 

@BeforeClass 
public static void initDriverMap(){ 
    driverMap.put("chrome", new ChromeDriver(DesiredCapabilities.chrome())); 
    driverMap.put("firefox", new FirefoxDriver(DesiredCapabilities.firefox())); 
} 

@AfterClass 
public static void cleanUp(){ 

    Iterator it = driverMap.entrySet().iterator(); 
    while (it.hasNext()) { 
     Map.Entry<String,WebDriver> pair = (Map.Entry)it.next(); 
     pair.getValue().close(); 
     try { 
      pair.getValue().quit(); 
     }catch(Exception e){} 
    } 
} 

@Test 
public void testWithChrome(){ 
    WebDriver driver = driverMap.get("chrome"); 
    testSuite(driver); 
} 

@Test 
public void testWithFirefox(){ 
    WebDriver driver = driverMap.get("firefox"); 
    testSuite(driver); 
} 

public void testSuite(WebDriver driver){ 
    driver.navigate().to("http://localhost:8000/web/"); 
    Assert.assertTrue("title should start with Polymer Todo App", 
      driver.getTitle().startsWith("Polymer Todo App")); 

    System.out.printf("This is a Test: '%s'\n", driver.getTitle()); 
    System.out.println(driver.getTitle().startsWith("Polymer Todo App")); 

//司机。关（）; // driver.quit（）; }

起初，我在@AfterClass没有尝试执行它的情况下运行它，它正确执行了所有的任务，但是在退出时失败了。由于我没有测试戒烟情况，所以我在周围试了一下以抑制戒烟，因为现在看来Mozilla正在根据需要进行戒烟。

从本质上讲，当我运行类来测试时，它会首先放入测试用例驱动程序。我不想自动化测试，因为我需要测试功能。我可以稍后更新。

在Afterclass中，我将运行清理并关闭所有打开的驱动程序。有一个缺点，就是所有的驾驶员都保持打开状态，直到测试全部完成。虽然我不想这样做，但我并不想在我的实际testSuite中加入try-catch。

上有一些变化的工作后，我发现最好的结果，导致了在给定时间点少的浏览器打开的情况如下：

public void testWithChrome(){ 
    WebDriver driver = new ChromeDriver(DesiredCapabilities.chrome()); 
    testSuite(driver); 
    driver.close(); 
    try { 
     driver.quit(); 
    }catch(Exception e){ 
     System.out.println("Driver error preventing from Quitting."); 
    } 
} 

@Test 
public void testWithFirefox(){ 
    WebDriver driver = new FirefoxDriver(DesiredCapabilities.firefox()); 
    testSuite(driver); 
    driver.close(); 
    try { 
     driver.quit(); 
    }catch(Exception e){ 
     System.out.println("Driver error preventing from Quitting."); 
    } 
} 

public void testSuite(WebDriver driver){ 
    driver.navigate().to("http://localhost:8000/web/"); 
    Assert.assertTrue("title should start with Polymer Todo App", 
      driver.getTitle().startsWith("Polymer Todo App")); 

    System.out.printf("This is a Test: '%s'\n", driver.getTitle()); 
    System.out.println(driver.getTitle().startsWith("Polymer Todo App")); 
} 

因为我想关闭并退出在司机相同的范围。这样就没有测试用例关闭浏览器，就像运行整个套件一样，然后在完成该功能时关闭。