def test_check_tab4(wind):
    'Test checker procedure again.'
    (window, _) = wind
    checktab = window.central.checkWidget
    window.central.setCurrentWidget(checktab)
    tree_widget = checktab.treeWidget
    assert (tree_widget.invisibleRootItem() is not None)
Test checker procedure again.
def test_check_tab4(wind):
    
    (window, _) = wind
    checktab = window.central.checkWidget
    window.central.setCurrentWidget(checktab)
    tree_widget = checktab.treeWidget
    assert (tree_widget.invisibleRootItem() is not None)