public class TestBuildPathPropertyPage extends BuildPathsPropertyPage implements IWorkbenchPropertyPage {

	protected BuildpathsBlock createBuildPathBlock(IWorkbenchPreferenceContainer pageContainer) {
		return new TestBuildPathBlock(new BusyIndicatorRunnableContext(), this, getSettings().getInt(INDEX), false,
				pageContainer);
	}

	public TestBuildPathPropertyPage() {
	}

	public IDLTKLanguageToolkit getLanguageToolkit() {
		return TestLanguageToolkit.getDefault();
	}

}

public class TestBuildPathBlock extends BuildpathsBlock {

	public TestBuildPathBlock(IRunnableContext runnableContext, IStatusChangeListener context, int pageToShow,
			boolean useNewPage, IWorkbenchPreferenceContainer pageContainer) {
		super(runnableContext, context, pageToShow, useNewPage, pageContainer);
	}

	protected IPreferenceStore getPreferenceStore() {
		return TestCorePlugin.getDefault().getPreferenceStore();
	}

	protected boolean supportZips() {
		return false;
	}

}

<extension point="org.eclipse.dltk.ui.buildpathContainerPage">
<buildpathContainerPage		 
class=" org.eclipse.dltk.ruby.internal.debug.ui.interpreters.RubyInterpreterContainerWizardPage "
id="org.eclipse.dltk.ruby.launching.INTERPRETER_CONTAINER"
name="Ruby Interpreter Libraries"
nature="org.eclipse.dltk.ruby.core.nature" />
</extension>

public class RubyInterpreterContainerWizardPage extends AbstractInterpreterContainerWizardPage {

	@Override
	public String getScriptNature() {
		return RubyNature.NATURE_ID;
	}

}

public class TestInterpreterContainerWizardPage extends AbstractInterpreterContainerWizardPage {

	@Override
	protected AbstractInterpreterComboBlock getInterpreterBlock() {
		return new TestInterpreterComboBlock();
	}
}

public class TestInterpreterComboBlock extends AbstractInterpreterComboBlock {

	@Override
	protected String getCurrentLanguageNature() {
		return TestNature.ID;
	}

	@Override
	protected void showInterpreterPreferencePage() {
		// TODO not implemented yet...
	}
}