TST: Increase test coverage for flate handling of image mode 1 #2339
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As mentioned in #2331, this will improve the test coverage for the edge cases.
Please note that I observed some need for further refactoring during the tests, as iterating over
bytes
will yield integers instead of single bytes and thus the whitespace check has been broken. Additionally, the whitespace check has previously always been performed on the shortened bytes data, which is rather useless - I somehow missed this previously.