@ministryofjustice/express-template-to-pdf/test/index.spec.js

Generates PDF from templates in Express routes

const express = require('express')
const path = require('path')
const request = require('supertest')
const pdfParse = require('pdf-parse')

const pdfRenderer = require('../index')

describe('pdfRenderer', () => {
  let app

  beforeEach(() => {
    app = express()
    app.set('views', path.join(__dirname, 'views'))
    app.set('view engine', 'pug')
  })

  it('sets response headers for PDF', () => {
    app.use(pdfRenderer())
    app.use('/pdf', (req, res) => {
      res.renderPDF('helloWorld', { message: 'Hello World!' }, { filename: 'test.pdf' })
    })

    return request(app)
      .get('/pdf')
      .expect(200)
      .expect('Content-Type', 'application/pdf')
      .expect('Content-Disposition', 'inline; filename=test.pdf')
      .then(response => {
        expect(Buffer.isBuffer(response.body)).to.equal(true, 'expect response body to be a binary')
      })
  })

  it('returns a buffer from the response', () => {
    app.use(pdfRenderer())
    app.use('/pdf', (req, res) => {
      res.renderPDF('helloWorld', { message: 'Hello World!' }, { filename: 'test.pdf' })
    })

    return request(app)
      .get('/pdf')
      .expect('Content-Transfer-Encoding', 'binary')
      .expect(200)
      .then(response => {
        expect(Buffer.isBuffer(response.body)).to.equal(true, 'binary response data is in res.body as a buffer')
      })
  })

  it('uses default filename if none set', () => {
    app.use(pdfRenderer())
    app.use('/pdf', (req, res) => {
      res.renderPDF('helloWorld', { message: 'Hello World!' })
    })

    return request(app)
      .get('/pdf')
      .expect(200)
      .expect('Content-Disposition', 'inline; filename=document.pdf')
  })

  it('passes on error to the next middleware', () => {
    app.use(pdfRenderer())

    app.use('/pdf', (req, res) => {
      res.renderPDF('non-existant-template', {
        message: 'Hello World!',
      })
    })

    // eslint-disable-next-line no-unused-vars
    app.use((error, req, res, next) => {
      res.status(500).send('Something went wrong')
    })

    return request(app)
      .get('/pdf')
      .expect(500)
      .then(res => {
        expect(res.text).to.be.equal('Something went wrong')
      })
  })

  it('renders template content into the PDF buffer', async () => {
    app.use(pdfRenderer())
    app.use('/pdf', (req, res) => {
      res.renderPDF('simple', { message: 'variable' })
    })

    const res = await request(app).get('/pdf')
    const pdf = await pdfParse(res.body)

    expect(pdf.numpages).to.eql(1)
    expect(pdf.text).contains('\n\nfixed\nvariable')
  })
})