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gh-136394: Make zstd freethreaded compression test order independent #136444

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gh-136394: Make zstd freethreaded compression test order independent #136444

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6 changes: 4 additions & 2 deletions Lib/test/test_zstd.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2675,15 +2675,17 @@ def test_compress_locking(self):

comp = ZstdCompressor()
parts = []
for _ in range(num_threads):
for _ in range(num_threads + 1):
res = comp.compress(input, ZstdCompressor.FLUSH_BLOCK)
if res:
parts.append(res)
rest1 = comp.flush()
expected = b''.join(parts) + rest1

comp = ZstdCompressor()
output = []
# Compress the first block to add the Zstandard header. This ensures
# that the parallel portion of the test is thread order independent.
output = [comp.compress(input, ZstdCompressor.FLUSH_BLOCK)]
def run_method(method, input_data, output_data):
res = method(input_data, ZstdCompressor.FLUSH_BLOCK)
if res:
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