JavaScript/String/test/CheckWordOcurrence.test.js

import { checkWordOccurrence } from '../CheckWordOccurrence'
describe('checkWordOccurrence', () => {
  it('expects throw on insert wrong string', () => {
    const value = 123
    expect(() => checkWordOccurrence(value)).toThrow()
  })
  it('expect throw on insert wrong param for case sensitive', () => {
    const value = 'hello'
    expect(() => checkWordOccurrence(value, value)).toThrow()
  })
  it('check occurrence with case sensitive', () => {
    const stringToTest = 'A Mad World'
    const charsOccurrences = checkWordOccurrence(stringToTest, true)
    const expectResult = { A: 1, M: 1, a: 1, d: 2, W: 1, l: 1, o: 1, r: 1 }
    const occurrencesObjectKeys = Object.keys(charsOccurrences)
    const expectObjectKeys = Object.keys(expectResult)
    expect(occurrencesObjectKeys.length).toBe(expectObjectKeys.length)
    expectObjectKeys.forEach(key => {
      expect(expectResult[key]).toBe(charsOccurrences[key])
    })
  })
  it('check occurrence with case insensitive', () => {
    const stringToTest = 'A Mad World'
    const charsOccurrences = checkWordOccurrence(stringToTest, false)
    const expectResult = { A: 2, D: 2, L: 1, M: 1, O: 1, R: 1, W: 1 }
    const occurrencesObjectKeys = Object.keys(charsOccurrences)
    const expectObjectKeys = Object.keys(expectResult)
    expect(occurrencesObjectKeys.length).toBe(expectObjectKeys.length)
    expectObjectKeys.forEach(key => {
      expect(expectResult[key]).toBe(charsOccurrences[key])
    })
  })
})