ReferenceError: "myfaces" is not defined.

I was running a Blackbox unit testing on a page consisting of JSF page using Selenium 2. If I were to use FirefoxDriver to run the test, the test completed successfully. But if I run the test using HtmlUnitDriver, it will fail and following error would be seen.

java.lang.RuntimeException: org.openqa.selenium.WebDriverException: com.gargoylesoftware.htmlunit.ScriptException: ReferenceError: "myfaces" is not defined.
Build info: version: '2.35.0', revision: 'c916b9d', time: '2013-08-12 15:42:01'
System info: os.name: 'Windows XP', os.arch: 'x86', os.version: '5.1', java.version: '1.6.0_30'
Driver info: driver.version: HtmlUnitDriver
 at com.anteambulo.SeleniumJQuery.jQueryFactory.js(jQueryFactory.java:124)
 at com.anteambulo.SeleniumJQuery.jQuery.js(jQuery.java:608)
 at com.anteambulo.SeleniumJQuery.jQuery.jsref(jQuery.java:612)
 at com.anteambulo.SeleniumJQuery.jQuery.click(jQuery.java:226)
 at org.huahsin.authentication.ForgotPassword.testEmptyLoginId(ForgotPassword.java:32)
 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.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
 at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
 at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
 at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
 at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
 at org.junit.runners.BlockJUnit4ClassRunner.runNotIgnored(BlockJUnit4ClassRunner.java:79)
 at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:71)
 at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49)
 at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
 at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
 at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
 at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
 at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
 at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31)
 at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
 at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
 at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
 at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
Caused by: org.openqa.selenium.WebDriverException: com.gargoylesoftware.htmlunit.ScriptException: ReferenceError: "myfaces" is not defined.
Build info: version: '2.35.0', revision: 'c916b9d', time: '2013-08-12 15:42:01'
System info: os.name: 'Windows XP', os.arch: 'x86', os.version: '5.1', java.version: '1.6.0_30'
Driver info: driver.version: HtmlUnitDriver
 at org.openqa.selenium.htmlunit.HtmlUnitDriver.executeScript(HtmlUnitDriver.java:497)
 at com.anteambulo.SeleniumJQuery.jQueryFactory.js(jQueryFactory.java:115)
 ... 29 more
Caused by: com.gargoylesoftware.htmlunit.ScriptException: ReferenceError: "myfaces" is not defined.
 at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$HtmlUnitContextAction.run(JavaScriptEngine.java:669)
 at net.sourceforge.htmlunit.corejs.javascript.Context.call(Context.java:601)
 at net.sourceforge.htmlunit.corejs.javascript.ContextFactory.call(ContextFactory.java:507)
 at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.callFunction(JavaScriptEngine.java:601)
 at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.callFunction(JavaScriptEngine.java:576)
 at com.gargoylesoftware.htmlunit.html.HtmlPage.executeJavaScriptFunctionIfPossible(HtmlPage.java:1005)
 at org.openqa.selenium.htmlunit.HtmlUnitDriver.executeScript(HtmlUnitDriver.java:491)
 ... 30 more
Caused by: net.sourceforge.htmlunit.corejs.javascript.EcmaError: ReferenceError: "myfaces" is not defined.
 at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.constructError(ScriptRuntime.java:3603)
 at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.constructError(ScriptRuntime.java:3587)
 at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.notFoundError(ScriptRuntime.java:3657)
 at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.nameOrFunction(ScriptRuntime.java:1749)
 at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.name(ScriptRuntime.java:1690)
 at net.sourceforge.htmlunit.corejs.javascript.Interpreter.interpretLoop(Interpreter.java:1622)
 at net.sourceforge.htmlunit.corejs.javascript.Interpreter.interpret(Interpreter.java:798)
 at net.sourceforge.htmlunit.corejs.javascript.InterpretedFunction.call(InterpretedFunction.java:105)
 at com.gargoylesoftware.htmlunit.javascript.host.EventHandler.call(EventHandler.java:81)
 at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.applyOrCall(ScriptRuntime.java:2378)
 at net.sourceforge.htmlunit.corejs.javascript.BaseFunction.execIdCall(BaseFunction.java:304)
 at net.sourceforge.htmlunit.corejs.javascript.IdFunctionObject.call(IdFunctionObject.java:89)
 at net.sourceforge.htmlunit.corejs.javascript.Interpreter.interpretLoop(Interpreter.java:1531)
 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:405)
 at com.gargoylesoftware.htmlunit.javascript.HtmlUnitContextFactory.doTopCall(HtmlUnitContextFactory.java:275)
 at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.doTopCall(ScriptRuntime.java:3031)
 at net.sourceforge.htmlunit.corejs.javascript.InterpretedFunction.call(InterpretedFunction.java:103)
 at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$4.doRun(JavaScriptEngine.java:594)
 at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$HtmlUnitContextAction.run(JavaScriptEngine.java:654)
 ... 36 more

As I search through the documentation, the default JavaScript engine of HtmlUnitDriver is from Rhino. Somehow not every browser following the same standard and have their very own version of implementation on JavaScript.

This is the text extract from the documentation:

When we say "javascript" we actually mean "javascript and the DOM". Although the DOM is defined by the W3C each browser out there has its own quirks and differences in their implementation of the DOM and in how javascript interacts with it. HtmlUnit has an impressively complete implementation of the DOM and has good support for using javascript, but it is no different from any other browser: it has its own quirks and differences from both the W3C standard and the DOM implementations of the major browsers, despite its ability to mimic other browsers.

To fix this issue, a true parameter need to be pass in to the constructor of HtmlUnitDriver as shown below. This is to mimic the JavaScript version running on Internet Explorer.

   ...
   new HtmlUnitDriver(true);
   ...