react-tagcloud/__tests__/helpers-test.js

Tag/word cloud component for react

import { omit, pick, fontSizeConverter } from '../src/helpers'

describe('helpers', () => {
  describe('omit', () => {
    it('should omit object properties', () => {
      const obj = omit({ a: 1, b: 2, c: 3, d: 4 }, ['a', 'c'])
      expect(obj).toEqual({ b: 2, d: 4 })
    })
  })

  describe('pick', () => {
    it('should include all object properties', () => {
      const obj = pick({ a: 1, b: 2, c: 3, d: 4 }, ['a', 'c'])
      expect(obj).toEqual({ a: 1, c: 3 })
    })

    it('should include all available object properties', () => {
      const obj = pick({ a: 1, b: 2, c: 3, d: 4 }, ['b', 'e'])
      expect(obj).toEqual({ b: 2 })
    })
  })

  describe('fontSizeConverter', () => {
    it('should minimal tag size', () => {
      const size = fontSizeConverter(25, 10, 1000, 12, 25)
      expect(size).toEqual(12)
    })

    it('should maximal tag size', () => {
      const size = fontSizeConverter(980, 10, 1000, 12, 25)
      expect(size).toEqual(25)
    })

    it('should middle tag size', () => {
      const size = fontSizeConverter(510, 10, 1000, 12, 25)
      expect(size).toEqual(19)
    })

    it('should handle devision by zero', () => {
      const size = fontSizeConverter(450, 10, 10, 12, 25)
      expect(size).toEqual(19)
    })
  })
})