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Edit: /opt/gsutil/third_party/charset_normalizer/tests/test_coherence_detection.py

import pytest
from charset_normalizer.cd import encoding_languages, mb_encoding_languages, is_multi_byte_encoding, get_target_features, filter_alt_coherence_matches

@pytest.mark.parametrize(
    "iana_encoding, expected_languages",
    [
        ("cp864", ["Arabic", "Farsi"]),
        ("cp862", ["Hebrew"]),
        ("cp737", ["Greek"]),
        ("cp424", ["Hebrew"]),
        ("cp273", ["Latin Based"]),
        ("johab", ["Korean"]),
        ("shift_jis", ["Japanese"]),
        ("mac_greek", ["Greek"]),
        ("iso2022_jp", ["Japanese"])
    ]
)
def test_infer_language_from_cp(iana_encoding, expected_languages):
    languages = mb_encoding_languages(iana_encoding) if is_multi_byte_encoding(iana_encoding) else encoding_languages(iana_encoding)

for expected_language in expected_languages:
        assert expected_language in languages, "Wrongly detected language for given code page"

@pytest.mark.parametrize(
    "language, expected_have_accents, expected_pure_latin",
    [
        ("English", False, True),
        ("French", True, True),
        ("Hebrew", False, False),
        ("Arabic", False, False),
        ("Vietnamese", True, True),
        ("Turkish", True, True)
    ]
)
def test_target_features(language, expected_have_accents, expected_pure_latin):
    target_have_accents, target_pure_latin = get_target_features(language)

assert target_have_accents is expected_have_accents
    assert target_pure_latin is expected_pure_latin

@pytest.mark.parametrize(
    "matches, expected_return",
    [
        ([("English", 0.88,), ("English—", 0.99)], [("English", 0.99)]),
        ([("English", 0.88,), ("English—", 0.99), ("English——", 0.999)], [("English", 0.999)]),
        ([("English", 0.88,), ("English—", 0.77)], [("English", 0.88)]),
        ([("English", 0.88,), ("Italian", 0.77)], [("English", 0.88), ("Italian", 0.77)]),
    ]
)
def test_filter_alt_coherence_matches(matches, expected_return):
    results = filter_alt_coherence_matches(matches)

assert results == expected_return

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