EasyMock for GWT + MVP ?

[fke...@gmail.com]

I remember EasyMock didn't work for GWT, because it needed reflection,
which wasn't available for client side programming. However, I'm doing
MVP tests, so the code need not run in hosted mode, so EasyMode should
run... right? However, I'm getting the following error -- can somebody
point me in the right direction?



java.lang.NoClassDefFoundError: net/sf/cglib/proxy/Enhancer at
org.easymock.classextension.internal.MocksClassControl.createProxyFactory
(MocksClassControl.java:78)
at org.easymock.internal.MocksControl.createMock(MocksControl.java:
50)
at org.easymock.classextension.EasyMock.createMock(EasyMock.java:46)
at com.fkereki.mvptest.client.LoginPresenterTest.setUp
(LoginPresenterTest.java:18)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke
(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke
(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:616)
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.RunBefores.evaluate
(RunBefores.java:27)
at org.junit.internal.runners.statements.RunAfters.evaluate
(RunAfters.java:31)
at org.junit.runners.BlockJUnit4ClassRunner.runChild
(BlockJUnit4ClassRunner.java:73)
at org.junit.runners.BlockJUnit4ClassRunner.runChild
(BlockJUnit4ClassRunner.java:46)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:180)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:41)
at org.junit.runners.ParentRunner$1.evaluate(ParentRunner.java:173)
at org.junit.internal.runners.statements.RunBefores.evaluate
(RunBefores.java:28)
at org.junit.internal.runners.statements.RunAfters.evaluate
(RunAfters.java:31)
at org.junit.runners.ParentRunner.run(ParentRunner.java:220)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run
(JUnit4TestReference.java:46)
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.ClassNotFoundException:
net.sf.cglib.proxy.Enhancer
at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
at java.lang.ClassLoader.loadClass(ClassLoader.java:323)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
at java.lang.ClassLoader.loadClass(ClassLoader.java:268)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:336)
... 27 more

[lowecg2004]

Your error looks like you're using the EasyMock class extensions and
are missing cglib jars from your build path.

As it happens, I recently produced a getting started with MVP and unit
testing with EasyMock article which might be of use:

http://blog.hivedevelopment.co.uk/2009/10/introduction-to-mvp-unit-testing-part.html

Cheers,

Chris.

[fke...@gmail.com]

On Oct 25, 9:11 am, lowecg2004 <chris.lowe...@gmail.com> wrote:
> Your error looks like you're using the EasyMock class extensions and
> are missing cglib jars from your build path.
>
> As it happens, I recently produced a getting started with MVP and unit
> testing with EasyMock article which might be of use:
>

> http://blog.hivedevelopment.co.uk/2009/10/introduction-to-mvp-unit-te...
>

Hi! Thanks for the heads up -- however, I find a couple of details:

* I added asm-3.1.jar and cglib-2.2.jar, which were in the GWT 2.0
tools/lib directory, but there was no asm-attrs.jar; do you still need
it?

* When running an empty JUnit (*not* GWTTestCase) test, which just
does loginViewMock=createMock(LoginView.class) I get another
exception... The GWT.create( ) problem -- how did you handle it? Or
did I miss a step in your article?

Thanks!!


java.lang.ExceptionInInitializerError

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke
(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke
(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:616)

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 com.fkereki.mvptest.client.LoginPresenterTest.testLoginPresenter1
(LoginPresenterTest.java:26)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke
(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke
(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:616)
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)

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:92)
at com.google.gwt.user.client.ui.UIObject.<clinit>(UIObject.java:140)
... 35 more

[Arthur Kalmenson]

It's possible to use EasyMock to mock out GWT widgets in a standard
JUnit or TestNG test, but you need to use GWTMockUtilities to disarm
GWT.

--
Arthur Kalmenson

[lowecg2004]

As Arthur said, calling GWTMockUtilities.disarm() will prevent that
error (that was in part 2 of my article :)

As for needing asm-attrs.jar, I guess try it - any
NoClassDefFoundError that looks asm related then that will answer your
question...

Cheers,

Chris.

[Thomas Broyer]

On 25 oct, 14:32, "fker...@gmail.com" <fker...@gmail.com> wrote:
> On Oct 25, 9:11 am, lowecg2004 <chris.lowe...@gmail.com> wrote:
>
> > Your error looks like you're using the EasyMock class extensions and
> > are missing cglib jars from your build path.
>
> > As it happens, I recently produced a getting started with MVP and unit
> > testing with EasyMock article which might be of use:
>
> >http://blog.hivedevelopment.co.uk/2009/10/introduction-to-mvp-unit-te...
>
> Hi! Thanks for the heads up -- however, I find a couple of details:
>
> * I added asm-3.1.jar and cglib-2.2.jar, which were in the GWT 2.0
> tools/lib directory, but there was no asm-attrs.jar; do you still need
> it?
>
> * When running an empty JUnit (*not* GWTTestCase) test, which just
> does loginViewMock=createMock(LoginView.class) I get another
> exception... The GWT.create( ) problem -- how did you handle it? Or
> did I miss a step in your article?

You'd generally mock your LoginPresenter.Display interface (or however
you called it, your probably have one; otherwise, here is when it is
useful to have one ;-) ), not your LoginView, which uses widgets,
which need GWTMockUtilities (but it does not always work: History for
instance cannot be used in "pure Java", even with
GWTMockUtilities.disarm()).

[fke...@gmail.com]

On Oct 25, 5:26 pm, lowecg2004 <chris.lowe...@gmail.com> wrote:
> As Arthur said, calling GWTMockUtilities.disarm() will prevent that
> error (that was in part 2 of my article :)
>
> As for needing asm-attrs.jar, I guess try it - any
> NoClassDefFoundError that looks asm related then that will answer your
> question...

Hi! Thanks for the help -- and as of now, everything is running fine
without asm-attrs.jar, though I'll keep it in mind just in case.. ;-)

[lowecg2004]

Cool - glad to hear you're up and running.