test: x/mint/types

[aljo242]

1. Summary

Add some tests to x/mint/types:

• genesis validation
• minter validation
• params validation
• refactor methods signatures to be in line with our other modules

2.Type of change

• New tests (non-breaking change which adds tests)

[codecov-commenter]

Codecov Report

Merging #322 (d897f2e) into main (0635179) will increase coverage by 0.76%.
The diff coverage is 83.87%.

@@            Coverage Diff             @@
##             main     #322      +/-   ##
==========================================
+ Coverage   54.40%   55.17%   +0.76%     
==========================================
  Files         152      152              
  Lines       12042    12050       +8     
==========================================
+ Hits         6552     6648      +96     
+ Misses       5030     4921     -109     
- Partials      460      481      +21     

Flag	Coverage Δ
unittests	55.17% <83.87%> (+0.76%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
x/mint/types/params.go	42.64% <64.28%> (+42.64%)	⬆️
x/mint/types/genesis.go	100.00% <100.00%> (+100.00%)	⬆️
x/mint/types/minter.go	100.00% <100.00%> (+100.00%)	⬆️

[joe-bowman]

lgtm

[ajansari95]

lgtm