def test_statistic_can_be_created_from_list():
data = [1, 2, 3]
st = Statistic(data)
assert len(st) == 3
assert not st.empty
assert st.as_list() == [1, 2, 3]
assert st.as_tuple() == tuple(data)
assert st.as_list() is not data # check that data was copied
def test_statistic_is_initially_empty():
st = Statistic()
assert len(st) == 0
assert st.empty
assert st.as_list() == []
assert st.as_tuple() == ()
def test_statistic_extend_adds_all_items():
st = Statistic([1])
st.extend([2, 3])
assert st.as_tuple() == (1, 2, 3)
def test_statistic_append_adds_values():
st = Statistic()
st.append(1)
st.append(20)
assert st.as_tuple() == (1, 20)
def test_statistic_copy_data_content_instead_of_pointer():
data = [1, 2]
st = Statistic(data)
st.append(3)
assert st.as_tuple() == (1, 2, 3)
assert data == [1, 2]