opened
YegorZaremba
username_0
**Motivation**

It'll be useful for newcomers who wanna use Jest framework

[Jest docs](https://jestjs.io/docs/en/mock-functions)
Re-write jest unit tests using native Jest mock instead of Sinon library
issue
closed
YegorZaremba
username_0
issue
created
YegorZaremba
username_0
a lot of commits because of playing with `commit-lint` and `git rebase`
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