test: migrate PriceTest to Kotlin.

[overcat]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.02%. Comparing base (c3f63e5) to head (cb14b86).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #728      +/-   ##
============================================
+ Coverage     80.97%   81.02%   +0.05%     
- Complexity     1318     1319       +1     
============================================
  Files           214      214              
  Lines          5071     5071              
  Branches        435      435              
============================================
+ Hits           4106     4109       +3     
+ Misses          709      706       -3     
  Partials        256      256              

see 1 file with indirect coverage changes

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