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tests/extmod/deflate_compress.py: Add a test for optimal compression. 

Signed-off-by: Damien George <damien@micropython.org>
This commit is contained in:
Damien George 2023-11-29 11:43:43 +11:00
parent 6ba57f760c
commit c554df57f6
2 changed files with 7 additions and 0 deletions
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6
tests/extmod/deflate_compress.py
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@ -146,3 +146,9 @@ for wbits in range(5, 10):
next_len = len(result) next_len = len(result)
print(next_len < prev_len and decompress(result, deflate.RAW, wbits) == buf) print(next_len < prev_len and decompress(result, deflate.RAW, wbits) == buf)
prev_len = next_len prev_len = next_len
# Verify that compression is optimal: in the bytes below, the final "123" should be
# compressed by referencing the "123" just before it, and not the one all the way back
# at the start of the bytes.
compressed = compress(b"1234567890abcdefghijklmnopqrstuvwxyz123123", deflate.RAW)
print(len(compressed), compressed)

1
tests/extmod/deflate_compress.py.exp
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@ -39,3 +39,4 @@ True
True True
True True
True True
41 b'3426153\xb7\xb04HLJNIMK\xcf\xc8\xcc\xca\xce\xc9\xcd\xcb/(,*.)-+\xaf\xa8\xac\x02\xaa\x01"\x00'