### Question:
AbstractPopoverImpl implements HasCellEditorControls.Editor<B> { @Override public void show() { binding.ifPresent(b -> view.show(Optional.ofNullable(getPopoverTitle()))); } protected  AbstractPopoverImpl(); protected  AbstractPopoverImpl(final V view); @Override HTMLElement getElement(); @Override void bind(final B bound,
                     final int uiRowIndex,
                     final int uiColumnIndex); @Override void setOnClosedByKeyboardCallback(final Consumer<CanBeClosedByKeyboard> callback); @Override void show(); @Override void hide();  }### Answer:
@Test @SuppressWarnings("unchecked") public void testShowNullControl() { popover.show(); verify(view, never()).show(any(Optional.class)); }