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Jest (describe('func', () => { }) (beforeEach (beforeEach( …

- - - - --coverage
        
        check coverage
  - - - where to cover jest
      - app/*.js
    - - determine how much coverage is good enough
      - "global" : { "function": 70 }
    - - determine test environment
      - default to be browser
      - prefer to set to node if you don't user browser environment
    - - Determine which file the test gonna run