def test_punctuation_joins():
txt = """
apple
apple.apple-apple
banana
apple?apple
banana
"""
actual = first_repeated_word(txt)
expected = "banana"
assert actual == expected
def test_ignore_case_flipped():
actual = first_repeated_word("apple BANANA banana apple")
expected = "banana"
assert actual == expected
def test_punctuation():
actual = first_repeated_word("apple? BANANA! banana, apple.")
expected = "banana"
assert actual == expected
def test_blank():
actual = first_repeated_word("")
expected = None
assert actual == expected
def test_ignore_case():
actual = first_repeated_word("apple banana BANANA apple")
expected = "banana"
assert actual == expected
def test_a_b_b_a():
actual = first_repeated_word("apple banana banana apple")
expected = "banana"
assert actual == expected
def test_a_a():
actual = first_repeated_word("apple apple")
expected = "apple"
assert actual == expected
def test_no_repeat():
actual = first_repeated_word("nobody here but us chickens")
expected = None
assert actual == expected