def test_calculate_entropy_2_order():
text = 'abcdd'
tree = __build_tree(text, 2)
got = __calculate_entropy(tree, len(text))
expected = 0.2
assert_equal(expected, got)
def test_calculate_entropy_1_order():
text = 'abcdd'
tree = __build_tree(text, 1)
got = __calculate_entropy(tree, len(text))
expected = 1.9219280948873623
assert_equal(expected, got)