tests: improve the signal/noise ratio of the test logs by 63% #85
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Before this change, the logs of the tests were littered with messages from Pillow:
After this change, on my machine, the size of the log produced by running "make test" goes from 1405 to 513 lines, a 63% reduction, that hopefully increases the signal noise ratio of the test logs.
This PR should be merged after #84.