我在一套导致广泛故障的 WebDriver 测试用例中遇到了一个奇怪的问题。
该套件中的一个测试用例目前预计会失败 - 网站中有一个未解决的错误导致选项卡消失。应该单击选项卡的测试用例调用 WebDriver 的 findElement 方法来查找选项卡。它等待标准超时，但随后，我没有抛出通常的异常并继续前进，而是开始在控制台中获取 SocketExceptions，这些异常不会被通常捕获错误的测试用例代码捕获：
Apr 18, 2013 8:47:23 AM org.apache.http.impl.client.DefaultRequestDirector tryConnect
INFO: I/O exception (java.net.SocketException) caught when connecting to the target host: No buffer space available (maximum connections reached?): connect
Apr 18, 2013 8:47:23 AM org.apache.http.impl.client.DefaultRequestDirector tryConnect
INFO: Retrying connect
Apr 18, 2013 8:47:23 AM org.apache.http.impl.client.DefaultRequestDirector tryConnect
INFO: I/O exception (java.net.SocketException) caught when connecting to the target host: No buffer space available (maximum connections reached?): connect
Apr 18, 2013 8:47:23 AM org.apache.http.impl.client.DefaultRequestDirector tryConnect
INFO: Retrying connect
Apr 18, 2013 8:47:23 AM org.apache.http.impl.client.DefaultRequestDirector tryConnect
INFO: I/O exception (java.net.SocketException) caught when connecting to the target host: No buffer space available (maximum connections reached?): connect
Apr 18, 2013 8:47:23 AM org.apache.http.impl.client.DefaultRequestDirector tryConnect
INFO: Retrying connect
SocketExceptions 导致 UnreachableBrowserException：
org.openqa.selenium.remote.UnreachableBrowserException: Error communicating with the remote browser. It may have died.
Build info: version: '2.25.0', revision: '17482', time: '2012-07-18 22:18:01'
System info: os.name: 'Windows 7', os.arch: 'amd64', os.version: '6.1', java.version: '1.6.0_32'
Driver info: driver.version: RemoteWebDriver
at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:493)
at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:502)
at org.openqa.selenium.remote.RemoteWebDriver.quit(RemoteWebDriver.java:372)
at com.brainshark.uitests.common.TestBase.afterClass(TestBase.java:243)
at sun.reflect.GeneratedMethodAccessor8.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:36)
at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
at com.brainshark.uitests.runners.BrainsharkTestRunner.run(BrainsharkTestRunner.java:51)
at org.junit.runners.Suite.runChild(Suite.java:128)
at org.junit.runners.Suite.runChild(Suite.java:24)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:252)
at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:141)
at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:112)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.maven.surefire.util.ReflectionUtils.invokeMethodWithArray(ReflectionUtils.java:189)
at org.apache.maven.surefire.booter.ProviderFactory$ProviderProxy.invoke(ProviderFactory.java:165)
at org.apache.maven.surefire.booter.ProviderFactory.invokeProvider(ProviderFactory.java:85)
at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:115)
at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:75)
Caused by: java.net.SocketException: No buffer space available (maximum connections reached?): connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:351)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:213)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:200)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
at java.net.Socket.connect(Socket.java:529)
at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:123)
at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:148)
at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:149)
at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:121)
at org.apache.http.impl.client.DefaultRequestDirector.tryConnect(DefaultRequestDirector.java:573)
at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:425)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:820)
at org.openqa.selenium.remote.HttpCommandExecutor.fallBackExecute(HttpCommandExecutor.java:319)
at org.openqa.selenium.remote.HttpCommandExecutor.execute(HttpCommandExecutor.java:297)
at org.openqa.selenium.firefox.internal.NewProfileExtensionConnection.execute(NewProfileExtensionConnection.java:136)
at org.openqa.selenium.firefox.FirefoxDriver$LazyCommandExecutor.execute(FirefoxDriver.java:357)
at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:472)
... 32 more
这会导致每个测试用例快速失败，并且在大约 10 秒内，每次尝试运行下一个测试用例都会触发上述失败。然后，神奇的事情发生了，异常停止了。
有谁知道我为什么会看到这种行为？或者什么需要 10 秒才能重置？我是否应该通过尝试检测此类情况并在尝试执行下一个测试用例之前保持静止 10 秒来解决此问题？谢谢！