pdf-merger-js/test/cli.test.js

merge multiple PDF documents, or parts of them, to a new PDF document

import path from 'path'
import fs from 'fs-extra'
import util from 'util'
import { exec } from 'child_process'
import { jest } from '@jest/globals'
import pdfDiff from 'pdf-diff'

const asyncExec = util.promisify(exec)

const __dirname = path.dirname(new URL(import.meta.url).pathname)
const FIXTURES_DIR = path.join(__dirname, 'fixtures')
const TMP_DIR = path.join(__dirname, 'tmp')

jest.setTimeout(10000)

async function mergePDFsCli (outputFile, inputFiles) {
  const { stdout, stderr } = await asyncExec(`node ./cli.js --output ${outputFile} ${inputFiles.join(' ')}`)
  return { stdout, stderr }
}

describe('issues', () => {
  beforeAll(async () => {
    await fs.ensureDir(TMP_DIR)
  })

  test('should merge two pdfs', async () => {
    await mergePDFsCli(path.join(TMP_DIR, 'Testfile_AB.pdf'), [
      path.join(FIXTURES_DIR, 'Testfile_A.pdf'),
      path.join(FIXTURES_DIR, 'Testfile_B.pdf')
    ])
    const diff = await pdfDiff(
      path.join(FIXTURES_DIR, 'Testfile_AB.pdf'),
      path.join(TMP_DIR, 'Testfile_AB.pdf')
    )
    expect(diff).toBeFalsy()
  })

  const testIfFetch = typeof fetch !== 'undefined' ? test : test.skip
  testIfFetch('should merge two pdfs from URL', async () => {
    await mergePDFsCli(path.join(TMP_DIR, 'Testfile_AB.pdf'), [
      'https://github.com/nbesli/pdf-merger-js/raw/master/test/fixtures/Testfile_A.pdf',
      'https://github.com/nbesli/pdf-merger-js/raw/master/test/fixtures/Testfile_B.pdf'
    ])
    const diff = await pdfDiff(
      path.join(FIXTURES_DIR, 'Testfile_AB.pdf'),
      path.join(TMP_DIR, 'Testfile_AB.pdf')
    )
    expect(diff).toBeFalsy()
  })

  test('combine single pages from multiple pdfs', async () => {
    await mergePDFsCli(path.join(TMP_DIR, '2468.pdf'), [
      path.join(FIXTURES_DIR, '123456789.pdf#2'),
      path.join(FIXTURES_DIR, '123456789.pdf#4'),
      path.join(FIXTURES_DIR, '123456789.pdf#6'),
      path.join(FIXTURES_DIR, '123456789.pdf#8')
    ])
    const diff = await pdfDiff(
      path.join(FIXTURES_DIR, '2468.pdf'),
      path.join(TMP_DIR, '2468.pdf')
    )
    expect(diff).toBeFalsy()
  })

  test('combine pages from multiple pdfs (list)', async () => {
    await mergePDFsCli(path.join(TMP_DIR, '2468.pdf'), [
      path.join(FIXTURES_DIR, '123456789.pdf#2,4'),
      path.join(FIXTURES_DIR, '123456789.pdf#6,8')
    ])
    const diff = await pdfDiff(
      path.join(FIXTURES_DIR, '2468.pdf'),
      path.join(TMP_DIR, '2468.pdf')
    )
    expect(diff).toBeFalsy()
  })

  test('combine pages from multipel pdfs (rang)', async () => {
    await mergePDFsCli(path.join(TMP_DIR, '123456789.pdf'), [
      path.join(FIXTURES_DIR, '123456789.pdf#1-5'),
      path.join(FIXTURES_DIR, '123456789.pdf#6-9')
    ])
    const diff = await pdfDiff(
      path.join(FIXTURES_DIR, '123456789.pdf'),
      path.join(TMP_DIR, '123456789.pdf')
    )
    expect(diff).toBeFalsy()
  })

  test('combine pages from multipel pdfs (combined list and range)', async () => {
    await mergePDFsCli(path.join(TMP_DIR, '123456789.pdf'), [
      path.join(FIXTURES_DIR, '123456789.pdf#1,2,3-4'),
      path.join(FIXTURES_DIR, '123456789.pdf#5-7,8to9')
    ])
    const diff = await pdfDiff(
      path.join(FIXTURES_DIR, '123456789.pdf'),
      path.join(TMP_DIR, '123456789.pdf')
    )
    expect(diff).toBeFalsy()
  })

  afterEach(async () => {
    for (const file of await fs.readdir(TMP_DIR)) {
      await fs.unlink(path.join(TMP_DIR, file))
    }
  })

  afterAll(async () => {
    await fs.remove(TMP_DIR)
  })
})