Add more tests

[nhz2]

This PR adds tests for the Z_NEED_DICT error, decoding large inputs, and decoding one byte at a time.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.51%. Comparing base (5c61dc6) to head (a1362fb).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #94      +/-   ##
==========================================
+ Coverage   82.97%   83.51%   +0.53%     
==========================================
  Files           4        4              
  Lines         188      188              
==========================================
+ Hits          156      157       +1     
+ Misses         32       31       -1     

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