def test_insert_elements():
g = MTG()
labels = g.property('label')
add_plant(g)
elts = [{'label': 'elt1'}, {'label': 'elt2'}]
collar = find_label('collar', g)[0]
insert_elements(g, collar, elts)
elt1 = find_label('elt1', g)[0]
assert labels[g.parent(elt1)] == 'baseElement'
assert labels[g.children(elt1)[0]] == 'elt2'
elt0 = insert_elements(g, collar, [{'label': 'elt0'}], before=elt1)[0]
assert labels[g.children(elt0)[0]] == 'elt1'
