def test_levenshtein_lcs(text1, text2, expected_result):
levenshtein_distance = char_metrics.Levenshtein()
err = levenshtein_distance.calculate(text1, text2, "lcs") - expected_result
assert -1e-5 < err < 1e-5
def test_levenshtein_osa(text1, text2, expected_result):
levenshtein_distance = char_metrics.Levenshtein()
assert levenshtein_distance.calculate(text1, text2,
osa=True) == expected_result