### Question:
ToolboxControlImpl extends AbstractCanvasHandlerRegistrationControl<AbstractCanvasHandler> implements ToolboxControl<AbstractCanvasHandler, Element> { public AbstractCanvasHandler getCanvasHandler() { return canvasHandler; } ToolboxControlImpl(final Supplier<List<F>> toolboxFactories);   ToolboxControlImpl(final Supplier<List<F>> toolboxFactories,
                       final Predicate<String> showToolboxPredicate); @Override @SuppressWarnings("unchecked") void register(final Element element); @Override Iterator<Toolbox<?>> getToolboxes(final Element element); void destroyToolboxes(); void hideAndDestroyToolboxes(); @SuppressWarnings("unchecked") ToolboxControl<AbstractCanvasHandler, Element> show(final String uuid); ToolboxControl<AbstractCanvasHandler, Element> show(final Element element); AbstractCanvasHandler getCanvasHandler(); boolean isActive(final String uuid); static final Predicate<String> ALWAYS_SHOW_PREDICATE; }### Answer:
@Test public void testInitnable() { tested.init(canvasHandler); assertEquals(canvasHandler, tested.getCanvasHandler()); }