phash-js/tests/index.test.js

Perceptual image hashing in the browser without using HTML canvas

import Magick from '../src/magickApi.js'
import pHash from '../src/index.js'
import data from './data/object.json'
import buffer from './data/buffer.json'

jest.mock('../src/magickApi.js', () => {
  return {
    Call: jest.fn()
  }
})

describe('pHash', () => {
  it('can calculate hash from data object', async () => {
    const hash = pHash._calculateHash(data)
    expect(hash.value).toBe('1011010111010110010100100000101100101011001011110011110111111111')
  })

  it('can return hash as hex value', async () => {
    const hash = pHash._calculateHash(data)
    expect(hash.toHex()).toBe('b5d6520b2b2f4000')
  })

  it('can return hash as integer', async () => {
    const hash = pHash._calculateHash(data)
    expect(hash.toInt()).toBe(13102750373803672000)
  })

  it('shoud return valid hash', async () => {
    Magick.Call.mockImplementation(() => {
      return [{ buffer: new Uint8Array(buffer) }]
    })

    const file = new File([new ArrayBuffer(1)], 'image.jpg', { type: 'image/jpeg' })
    const hash = await pHash.hash(file)

    expect(hash.value).toBe('1011010111010110010100100000101100101011001011110011110111110111')
  })
})