Problem with GWT unit tests in wiki30-realtime-wysiwyg-gwt-dom-mutation

On branch wysiwyg.
I have added a new unit test: testDeleteSingleCharacter in DefaultMutationOperatorTest.
The problem is that when running the command "mvn clean gwt:test" I get the error: [ERROR] Class not found "org.xwiki.gwt.dom.mutation.MutationTestSuite". Perhaps this class should be moved to client package as well...
On the other hand, when running the command "mvn clean package", the test suite is successfully executed.

I made on purpose the newly test to fail and I have removed all related artifacts from m2 repo in order to better isolate this strange behaviour, but nothing so far.

Can you reproduce it - using the 2 commands issued at the root of the wiki30-realtime-wysiwyg-gwt-dom-mutation dir?
Meanwhile I'll try changing the plugin version.