Trouble getting reference to button in GWTTestCase

Hi,

I'm using GWT 2.4 with JUnit 4.8.1. I want to simulate clicking on a
button on my page. When I run the app normally, I can easily click on
the button. Here's how I reference it in my module EntryPoint
class ...

public void onModuleLoad() {
final com.google.gwt.dom.client.Element submitElement =
Document.get().getElementById(SUBMIT_BUTTON_ID);
final Button submitButton = Button.wrap(submitElement);

However, when I run my GWTTestCase, the "submitElement" field above is
null. Any ideas how I can change my test case to set this up
correctly? Right now my test case consists of ...

public class GetHtmlTest extends GWTTestCase {

...

@Override
public String getModuleName() {
return "com.myco.clearing.productplus.Productplus_gwt";
}

public void prepareTests() {
productPlusModule = new Productplus_gwt();
productPlusModule.onModuleLoad();
nameField =
TextBox.wrap(Document.get().getElementById(Productplus_gwt.NAME_FIELD_ID));
submitButton =
Button.wrap(Document.get().getElementById(Productplus_gwt.SUBMIT_BUTTON_ID));

} // prepareTests

@Test
public void testSuccessEvent() {
prepareTests();

Here's the exact exception and stack trace. I have this GWT project
set up in Eclipse Indigo, and run it by click-clicking my test case
and select "Run As" -> "GWT Junit Test".

java.lang.RuntimeException: Remote test failed at 10.40.70.197 /
Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.19) Gecko/
2010031422 Firefox/3.0.19
at com.google.gwt.junit.JUnitShell.processTestResult(JUnitShell.java:
1288)
at com.google.gwt.junit.JUnitShell.runTestImpl(JUnitShell.java:1408)
at com.google.gwt.junit.JUnitShell.runTestImpl(JUnitShell.java:1309)
at com.google.gwt.junit.JUnitShell.runTest(JUnitShell.java:653)
at com.google.gwt.junit.client.GWTTestCase.runTest(GWTTestCase.java:
441)
at junit.framework.TestCase.runBare(TestCase.java:134)
at junit.framework.TestResult$1.protect(TestResult.java:110)
at junit.framework.TestResult.runProtected(TestResult.java:128)
at junit.framework.TestResult.run(TestResult.java:113)
at junit.framework.TestCase.run(TestCase.java:124)
at com.google.gwt.junit.client.GWTTestCase.run(GWTTestCase.java:296)
at junit.framework.TestSuite.runTest(TestSuite.java:232)
at junit.framework.TestSuite.run(TestSuite.java:227)
at
org.junit.internal.runners.JUnit38ClassRunner.run(JUnit38ClassRunner.java:
83)
at
org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:
50)
at
org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:
38)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:
467)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:
683)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:
390)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:
197)
Caused by: java.lang.AssertionError: Child cannot be null
at com.google.gwt.dom.client.Node$.isOrHasChild$(Node.java:278)
at com.google.gwt.user.client.ui.Button.wrap(Button.java:55)
at
com.myco.clearing.productplus.client.Productplus_gwt.onModuleLoad(Productplus_gwt.java:
35)
at
com.myco.clearing.productplus.client.GetHtmlTest.prepareTests(GetHtmlTest.java:
33)
at
com.myco.clearing.productplus.client.GetHtmlTest.testSuccessEvent(GetHtmlTest.java:
43)
at
com.myco.clearing.productplus.client.__GetHtmlTest_unitTestImpl.doRunTest(__GetHtmlTest_unitTestImpl.java:
7)
at junit.framework.TestCase.runTest(TestCase.java:62)
at com.google.gwt.junit.client.GWTTestCase.runBare(GWTTestCase.java:
188)
at
com.google.gwt.junit.client.GWTTestCase.__doRunTest(GWTTestCase.java:
129)
at com.google.gwt.junit.client.impl.GWTRunner.runTest(GWTRunner.java:
389)
at
com.google.gwt.junit.client.impl.GWTRunner.doRunTest(GWTRunner.java:
318)
at com.google.gwt.junit.client.impl.GWTRunner.access$9(GWTRunner.java:
312)
at com.google.gwt.junit.client.impl.GWTRunner
$TestBlockListener.onSuccess(GWTRunner.java:107)
at com.google.gwt.junit.client.impl.GWTRunner
$InitialResponseListener.onSuccess(GWTRunner.java:63)
at com.google.gwt.junit.client.impl.GWTRunner
$InitialResponseListener.onSuccess(GWTRunner.java:1)
at
com.google.gwt.user.client.rpc.impl.RequestCallbackAdapter.onResponseReceived(RequestCallbackAdapter.java:
232)
at
com.google.gwt.http.client.Request.fireOnResponseReceived(Request.java:
287)
at com.google.gwt.http.client.RequestBuilder
$1.onReadyStateChange(RequestBuilder.java:395)
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 com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:
103)
at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:
71)
at
com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:
172)
at
com.google.gwt.dev.shell.BrowserChannelServer.reactToMessagesWhileWaitingForReturn(BrowserChannelServer.java:
337)
at
com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:
218)
at
com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:
136)
at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:
561)
at
com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:
269)
at
com.google.gwt.dev.shell.JavaScriptHost.invokeNativeObject(JavaScriptHost.java:
91)
at com.google.gwt.core.client.impl.Impl.apply(Impl.java)
at com.google.gwt.core.client.impl.Impl.entry0(Impl.java:220)
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 com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:
103)
at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:
71)
at
com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:
172)
at
com.google.gwt.dev.shell.BrowserChannelServer.reactToMessages(BrowserChannelServer.java:
292)
at
com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:
546)
at
com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:
363)
at java.lang.Thread.run(Thread.java:662)

Thanks, - Dave

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