test-pattern: substitute common compression list The compression list as to be matched with a glob because zstd might not be part of the option. By using a substitution for these, we won't have to re-glob them over and over.

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# common patterns in test at can safely be replaced

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from __future__ import absolute_import

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substitutions = [

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    # list of possible compressions

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    (br'zstd,zlib,none,bzip2',

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     br'$USUAL_COMPRESSIONS$'

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    ),

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]