also I found this article interesting:

http://blog.danielwellman.com/2009/02/mocking-gwt-widgets-with-gwtmockutilities.html

On Wed, Aug 19, 2009 at 12:28 PM, Alejandro D. Garin <[email protected]>wrote:

> David,
>
> Maybe GWTMockUtilities could help, but didn't tried it.
>
> On Wed, Aug 19, 2009 at 12:19 PM, davis <[email protected]>wrote:
>
>>
>> Probably stems from the constructor doing this:
>>
>>  /**
>>   * Creates an empty text box.
>>   */
>>  public TextBox() {
>>    this(Document.get().createTextInputElement(), "gwt-TextBox");
>>  }
>>
>>
>> http://code.google.com/p/google-web-toolkit/source/browse/releases/1.7/user/src/com/google/gwt/user/client/ui/TextBox.java
>>
>> Anyone have a mock workaround for ui elements they'd like to share?
>> Is there a mock framework out there for GWT ui elements?
>>
>> On Aug 19, 11:14 am, davis <[email protected]> wrote:
>> > My fault -- I thought you were talking about something else.  It
>> > appears you are correct.  It looks like even easy mock class extension
>> > can't do it.  Somewhere in the initialization code of TextBox.class it
>> > calls GWT.create()...major bummer.
>> >
>> > On Aug 19, 10:59 am, "Alejandro D. Garin" <[email protected]> wrote:
>> >
>> > > Hi David,
>> >
>> > > I tried your example, but I have this error:
>> >
>> > > Caused by: java.lang.UnsupportedOperationException: ERROR:
>> GWT.create() is
>> > > only usable in client code!  It cannot be called, for example, from
>> server
>> > > code.  If you are running a unit test, check that your test case
>> extends
>> > > GWTTestCase and that GWT.create() is not called from within an
>> initializer
>> > > or constructor.
>> >
>> > > Stacktrace:
>> >
>> > > java.lang.ExceptionInInitializerError
>> > >     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>> > >     at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
>> > >     at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
>> > >     at java.lang.reflect.Method.invoke(Unknown Source)
>> > >     at
>> net.sf.cglib.proxy.Enhancer.setCallbacksHelper(Enhancer.java:619)
>> > >     at
>> net.sf.cglib.proxy.Enhancer.setThreadCallbacks(Enhancer.java:612)
>> > >     at
>> net.sf.cglib.proxy.Enhancer.registerCallbacks(Enhancer.java:581)
>> > >     at
>> > >
>> org.easymock.classextension.internal.ClassProxyFactory.createProxy(ClassProxyFactory.java:108)
>> > >     at
>> org.easymock.internal.MocksControl.createMock(MocksControl.java:51)
>> > >     at
>> org.easymock.classextension.EasyMock.createMock(EasyMock.java:46)
>> > >     at
>> example.publico.client.SimpleTest.testSimple(SimpleTest.java:10)
>> > >     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>> > >     at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
>> > >     at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
>> > >     at java.lang.reflect.Method.invoke(Unknown Source)
>> > >     at junit.framework.TestCase.runTest(TestCase.java:168)
>> > >     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 junit.framework.TestSuite.runTest(TestSuite.java:232)
>> > >     at junit.framework.TestSuite.run(TestSuite.java:227)
>> > >     at
>> > >
>> org.junit.internal.runners.OldTestClassRunner.run(OldTestClassRunner.java:76)
>> > >     at
>> > >
>> org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:45)
>> > >     at
>> > >
>> org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
>> > >     at
>> > >
>> org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460)
>> > >     at
>> > >
>> org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673)
>> > >     at
>> > >
>> org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386)
>> > >     at
>> > >
>> org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)
>> > > Caused by: java.lang.UnsupportedOperationException: ERROR:
>> GWT.create() is
>> > > only usable in client code!  It cannot be called, for example, from
>> server
>> > > code.  If you are running a unit test, check that your test case
>> extends
>> > > GWTTestCase and that GWT.create() is not called from within an
>> initializer
>> > > or constructor.
>> > >     at com.google.gwt.core.client.GWT.create(GWT.java:85)
>> > >     at
>> com.google.gwt.user.client.ui.UIObject.<clinit>(UIObject.java:140)
>> > >     ... 30 more
>> >
>> > > On Wed, Aug 19, 2009 at 11:09 AM, davis <[email protected]
>> >wrote:
>> >
>> > > > > If your view interface return a TextBox you can't test the
>> presenter with
>> > > > > JUnit, you will need to use GWTTestCase.
>> >
>> > > > Sure you can:
>> >
>> > > > import static org.easymock.classextension.EasyMock.*;
>> > > > import com.google.gwt.user.client.ui.TextBox;
>> >
>> > > > public class SomePresenterTestCase {
>> >
>> > > >   private MyPresenter presenter;
>> > > >   private MyView view;
>> >
>> > > >   @Test
>> > > >   public void testSomething() {
>> > > >       TextBox mockBox = createMock(TextBox.class);
>> > > >       MyView mockView = createMock(MyView.class);
>> > > >       presenter = new MyPresenter(mockView);
>> > > >       expect(mockView.getSomeTextBox()).andReturn(mockBox);
>> > > >       replay(mockView);
>> > > >       replay(mockBox);
>> > > >       TextBox box = presenter.getDisplay().getSomeTextBox();
>> > > >       verify(mockView);
>> > > >    }
>> > > > }
>> >>
>>
>

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