refactor(java-bindings): add test

[toadfanszz]

Thanks to https://github.com/deviceplug/jni-utils-rs

[codecov]

Codecov Report

Merging #154 (6eb4130) into main (4439110) will increase coverage by 11.14%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##               main     #154       +/-   ##
=============================================
+ Coverage     53.33%   64.48%   +11.14%     
  Complexity        2        2               
=============================================
  Files            94       70       -24     
  Lines          2923     1971      -952     
  Branches        155      155               
=============================================
- Hits           1559     1271      -288     
+ Misses         1309      645      -664     
  Partials         55       55               

Flag	Coverage Δ
csharp	40.15% <ø> (ø)
kotlin	62.39% <ø> (ø)
nodejs	98.97% <ø> (ø)
rust	?

see 24 files with indirect coverage changes

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