* x/distribution/simulation/operations.go: add unit tests
* Use NewDecCoins constructor instead of the DecCoins struct
* Refactor code to use a testing suite
Co-authored-by: Federico Kunze <31522760+fedekunze@users.noreply.github.com>
Co-authored-by: Alexander Bezobchuk <alexanderbez@users.noreply.github.com>
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