[issue12057] HZ codec has no test

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

iso2022_tests.patch: add some tests for ISO2022 encodings:
 - testcase for iso2022_jp and iso2022_kr, iso2022_jp2 reuses iso2022_jp testcase
 - test some invalid byte sequences

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Added file: http://bugs.python.org/file22099/iso2022_tests.patch

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