Contract/v stable swap unit test

[twwu123]

PR Details

Add unit tests for the v stable swap contract

Checklist

• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] I have added tests to cover my changes.
• [x] All new and existing tests passed.

[codecov-commenter]

Codecov Report

Merging #284 (046c0a0) into exchange (17501fa) will increase coverage by 3.18%. The diff coverage is 100.00%.

@@             Coverage Diff              @@
##           exchange     #284      +/-   ##
============================================
+ Coverage     59.70%   62.88%   +3.18%     
============================================
  Files           207      207              
  Lines          7326     7329       +3     
  Branches        270      255      -15     
============================================
+ Hits           4374     4609     +235     
+ Misses         2952     2720     -232     

Impacted Files	Coverage Δ
...main/scala/vsys/blockchain/contract/Contract.scala	86.04% <100.00%> (+0.16%)	:arrow_up:
...vsys/blockchain/contract/ContractVStableSwap.scala	100.00% <100.00%> (+100.00%)	:arrow_up:

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