def test_empty_tabs_append(document, comm):
tabs = Tabs()
model = tabs.get_root(document, comm=comm)
div1 = Div()
tabs.append(('test title', div1))
assert len(model.tabs) == 1
assert model.tabs[0].title == 'test title'
def test_tabs_append(document, comm):
div1, div2 = Div(), Div()
p1 = Pane(div1, name='Div1')
p2 = Pane(div2, name='Div2')
tabs = Tabs(p1, p2)
model = tabs._get_model(document, comm=comm)
div3 = Div()
tabs.append(div3)
tab1, tab2, tab3 = model.tabs
