def test_append_child():
section = ExperimentSection(make_tree(['session', 'block', 'trial'], {}), ChainMap())
section.append_child(dict(test=True))
yield check_test_data, section[-1]
assert section[-1].data['block'] == 7
section[-1].append_child(dict(tree=next(next(section.tree))))
for trial in section[-1]:
yield check_test_data, trial
section[1].append_child(dict(test=True), to_start=True)
yield check_test_data, section[1][1]
assert len(section[1]) == 7
assert [trial.data['trial'] for trial in section[1]] == list(range(1, 8))
