Improved test for nullable struct read from Avro

[jorgecarleitao]

No description provided.

[codecov]

Codecov Report

Merging #1250 (f7958e3) into main (96df5e1) will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1250      +/-   ##
==========================================
+ Coverage   83.15%   83.17%   +0.01%     
==========================================
  Files         359      359              
  Lines       38063    38063              
==========================================
+ Hits        31650    31657       +7     
+ Misses       6413     6406       -7     

Impacted Files	Coverage Δ
src/io/ipc/read/file.rs	97.32% <0.00%> (ø)
src/io/ipc/read/common.rs	95.29% <0.00%> (+0.39%)	⬆️
src/io/avro/read/deserialize.rs	81.66% <0.00%> (+0.55%)	⬆️
src/io/ipc/read/array/boolean.rs	98.14% <0.00%> (+7.40%)	⬆️

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