yarn
yarn test
- Ref: https://code.visualstudio.com/docs/languages/jsconfig#_what-is-jsconfigjson
- Ref: https://code.visualstudio.com/docs/languages/jsconfig#_jsconfig-options
- Ref: https://jestjs.io/docs/configuration#modulenamemapper-objectstring-string--arraystring
- Ref: https://remarkablemark.org/blog/2018/06/28/jest-mock-default-named-export/