@Test public void createErrorHandlingInfraStructureTest() { PropertyEditorTextBox widget = GWT.create(PropertyEditorTextBox.class); PropertyEditorItemWidget itemWidget = GWT.create(PropertyEditorItemWidget.class); PropertyEditorItemsWidget parent = GWT.create(PropertyEditorItemsWidget.class); PropertyEditorErrorWidget errorWidget = GWT.create(PropertyEditorErrorWidget.class); PropertyEditorHelper.createErrorHandlingInfraStructure(parent, itemWidget, errorWidget, widget); verify(widget).setErrorWidget(errorWidget); verify(widget).setParent(parent); verify(itemWidget).add(widget); }