fix: add overflow checking and test codes for cover edge cases#458

Merged

dongsam merged 8 commits intotendermint:developfrom b-harvest:457-add-test-for-cover-edge-cases

Oct 25, 2021

+467-44

Commits on Oct 21, 2021

test: add testcase for cover small withdrawal case
dongsam
committed

Commits on Oct 25, 2021