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CountSubstrings.test.js

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import { countSubstrings } from '../CountSubstrings'

describe('CountSubstrings', () => {

it('count multiple occurrences of substring in a string', () => {

const str = 'This is a string'

const substring = 'is'

const count = countSubstrings(str, substring)

expect(count).toBe(2)

})

it('should return 0 when input substring has no occurrences', () => {

const str = 'Jurassic Park'

const substring = 'World'

const count = countSubstrings(str, substring)

expect(count).toBe(0)

})

it('should return 1 when input substring is of length 1 that is equal to string', () => {

const str = 's'

const substring = 's'

const count = countSubstrings(str, substring)

expect(count).toBe(1)

})

it('should return the correct result when input string contains spaces', () => {

const str = 'ab cd ef ghi'

const substring = ' '

const count = countSubstrings(str, substring)

expect(count).toBe(4)

})

it('should return the correct result when input substring contains number or special characters', () => {

const str = 'abc1@2def1@2'

const substring = '1@2'

const count = countSubstrings(str, substring)

expect(count).toBe(2)

})

it('should return string.length + 1 when the input substring is an empty string', () => {

const str = 'empty'

const substring = ''

const count = countSubstrings(str, substring)

expect(count).toBe(6)

})

it('should return correct result when input is overlapping substring', () => {

const str = 'aaa'

const substring = 'aa'

const count = countSubstrings(str, substring)

expect(count).toBe(2)

})

})