def test_sample_0():
assert alternatingCharacters("AAAA") == 3
assert alternatingCharacters("BBBBB") == 4
assert alternatingCharacters("ABABABAB") == 0
assert alternatingCharacters("BABABA") == 0
assert alternatingCharacters("AAABBB") == 4
def test_case_4():
root = Path(__file__).parent
outputs = (
root /
"alternating_characters_test_case_4_output.txt").open().readlines()
with (root / "alternating_characters_test_case_4.txt").open() as f:
for idx, line in enumerate(f.readlines()):
if idx == 0:
continue
assert alternatingCharacters(line.strip()) == int(
outputs[idx - 1].strip())
def test_sample_1():
assert alternatingCharacters("AAABBBAABB") == 6
assert alternatingCharacters("AABBAABB") == 4
assert alternatingCharacters("BABABAA") == 1
def test_sample_2():
assert alternatingCharacters("ABBABBAA") == 3
def test_alternating_characters(data, expected):
assert alternatingCharacters(data) == expected