[issue3424] imghdr test order makes it slow

[Ilpo Nyyssönen]

Ilpo Nyyssönen <iny at iki.fi> added the comment:

Naturally it requires a big amount of files. Getting big amount of jpegs
is easy. Getting big amount of pbms or rgbs is not so easy.

I'll attach two profiling runs showing some difference when test_jpeg
and test_exif are moved to be the first tests. The beginnings those
outputs show the return value counts.

Added file: http://bugs.python.org/file10958/current

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