def test_group_data_behaves():
groups = data.group_data_by_date(data_sets)
assert len(groups) == 4
assert len(groups[1]) == 3
assert len(groups[8]) == 1
group_for_1 = [data_sets[0][0], data_sets[1][0], data_sets[2][0]]
assert groups[1] == group_for_1
def test_remove_incomplete_data_points():
groups = data.group_data_by_date(data_sets)
filtered = data.remove_incomplete_data_points(groups)
assert len(filtered) == 1
group_for_1 = [data_sets[0][0], data_sets[1][0], data_sets[2][0]]
assert filtered[1] == group_for_1
def test_group_data_by_date_should_yield_defaultdict(): # hint
assert isinstance(data.group_data_by_date(data_sets), defaultdict)
assert data.group_data_by_date(data_sets).default_factory == list
def test_order_dictionary_by_dates_behaves_nicely():
groups = data.group_data_by_date(data_sets)
ordered_dict = data.order_dictionary_by_date(groups)
keys = list(ordered_dict.keys())
assert keys == list(sorted(keys))
