java - HtmlUnitDriver中提供浏览器版本有什么用

Question

我正在尝试在 Linux 机器上运行 selenium webdriver。所以我尝试使用 HtmlUnitDriver 来实现这一点。

执行 jquery 时出现以下错误。

TypeError: Cannot find function addEventListener in object [object HTMLDocument]. (http://localhost/xxx/js_lib/jquery2/jquery-2.1.0.min.js#2)

在没有任何浏览器版本的情况下使用 HtmlunitDriver 时会出现上述异常，如下所示，

HtmlUnitDriver driver = new HtmlUnitDriver();
driver.setJavascriptEnabled(true);

此外，由于以下原因，junit 测试用例也失败了，

org.openqa.selenium.NoSuchElementException: Unable to locate element with ID: abcde

如果我通过如下浏览器版本，

HtmlUnitDriver driver = new HtmlUnitDriver(BrowserVersion.FIREFOX_38);
driver.setJavascriptEnabled(true);

测试用例正在通过，但在控制台中抛出异常，如

SEVERE: Job run failed with unexpected RuntimeException: Exception invoking Window.getComputedStyle() with arguments [Text, String]
======= EXCEPTION START ========
Exception class=[java.lang.IllegalArgumentException]
com.gargoylesoftware.htmlunit.ScriptException: Exception invoking Window.getComputedStyle() with arguments [Text, String]
    at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$HtmlUnitContextAction.run(JavaScriptEngine.java:847)
    at net.sourceforge.htmlunit.corejs.javascript.Context.call(Context.java:628)
    at net.sourceforge.htmlunit.corejs.javascript.ContextFactory.call(ContextFactory.java:513)
    at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.callFunction(JavaScriptEngine.java:779)
    at com.gargoylesoftware.htmlunit.javascript.host.xml.XMLHttpRequest.setState(XMLHttpRequest.java:233)
    at com.gargoylesoftware.htmlunit.javascript.host.xml.XMLHttpRequest.doSend(XMLHttpRequest.java:762)
    at com.gargoylesoftware.htmlunit.javascript.host.xml.XMLHttpRequest.access$000(XMLHttpRequest.java:104)
    at com.gargoylesoftware.htmlunit.javascript.host.xml.XMLHttpRequest$1.run(XMLHttpRequest.java:623)
    at net.sourceforge.htmlunit.corejs.javascript.Context.call(Context.java:628)
    at net.sourceforge.htmlunit.corejs.javascript.ContextFactory.call(ContextFactory.java:513)
    at com.gargoylesoftware.htmlunit.javascript.background.JavascriptXMLHttpRequestJob.run(JavascriptXMLHttpRequestJob.java:36)
    at com.gargoylesoftware.htmlunit.javascript.background.JavaScriptJobManagerImpl.runSingleJob(JavaScriptJobManagerImpl.java:415)
    at com.gargoylesoftware.htmlunit.javascript.background.DefaultJavaScriptExecutor.run(DefaultJavaScriptExecutor.java:167)
    at java.lang.Thread.run(Thread.java:744)
Caused by: java.lang.IllegalArgumentException: Exception invoking Window.getComputedStyle() with arguments [Text, String]
    at net.sourceforge.htmlunit.corejs.javascript.MemberBox.invoke(MemberBox.java:193)
    at net.sourceforge.htmlunit.corejs.javascript.FunctionObject.call(FunctionObject.java:449)
    at net.sourceforge.htmlunit.corejs.javascript.Interpreter.interpretLoop(Interpreter.java:1536)
    at net.sourceforge.htmlunit.corejs.javascript.Interpreter.interpret(Interpreter.java:798)
    at net.sourceforge.htmlunit.corejs.javascript.InterpretedFunction.call(InterpretedFunction.java:105)
    at net.sourceforge.htmlunit.corejs.javascript.ContextFactory.doTopCall(ContextFactory.java:411)
    at com.gargoylesoftware.htmlunit.javascript.HtmlUnitContextFactory.doTopCall(HtmlUnitContextFactory.java:309)
    at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.doTopCall(ScriptRuntime.java:3286)
    at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$4.doRun(JavaScriptEngine.java:772)
    at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$HtmlUnitContextAction.run(JavaScriptEngine.java:832)
    ... 13 more
Caused by: java.lang.IllegalArgumentException: java.lang.ClassCastException@4d3015e7
    at sun.reflect.GeneratedMethodAccessor55.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at net.sourceforge.htmlunit.corejs.javascript.MemberBox.invoke(MemberBox.java:153)
    ... 22 more

我有以下问题列表，

1. 要在 HtmlUnitDriver 中使用 firefox 浏览器，我需要在 Linux 机器上安装 firefox 吗？
2. 为什么会抛出上述异常？
3. 是否有任何选项可以在没有 GUI 的情况下在 lunix 机器上运行 selenium？

我是 selenium 的新手，需要您对此提出宝贵意见。谢谢

Answer 1

To use firefox browser in HtmlUnitDriver, Do i need to install firefox in Linux machine ?

不，您不需要安装任何真正的浏览器。

Why the above exceptions are thrown?

由于HtmlUnit JavaScript 支持有时不是很准确，请阅读here .

此外，请尽量提供完整的详细信息(URL 或小型示例项目)，以便其他人可以看到相同的错误。