@Test
public void showCheck() {

    listGroupItemViewSpy.showCheck(true);
    verify(checkElementStyleMock, times(1)).setDisplay(eq(Style.Display.BLOCK));
    verify(listGroupItemMock, times(1)).addClassName(eq(SELECTED));
    //
    reset();
    listGroupItemViewSpy.showCheck(false);
    verify(checkElementStyleMock, times(1)).setDisplay(eq(Style.Display.NONE));
    verify(listGroupItemMock, times(1)).removeClassName(eq(SELECTED));
}