hal2dy / html-scan

src/test/helper/output.test.js

const fs = require('fs')
const { join } = require('path')

const outputHelper = require('../../helper/output')
const TIMEOUT = 1000

describe('Output helper', () => {
  const spyError = jest.spyOn(console, 'error').mockImplementation(() => {})

The variable jest seems to be never declared. If this is a global, consider adding a /** global: jest */ comment.

  const spyLog = jest.spyOn(console, 'log').mockImplementation(() => {})

The variable jest seems to be never declared. If this is a global, consider adding a /** global: jest */ comment.

  const file = 'src/test/output.txt'
  const path = join(file)

  it('output has empty data', () => {
    const result = outputHelper('', null)
    expect(result).toBe(null)
  })

  it('output is console', () => {
    outputHelper(null, 'data')
    expect(spyLog).toHaveBeenCalled()
    expect(spyLog.mock.calls[0][0]).toContain('data')
  })

  it('output to file', done => {
    fs.truncateSync(path)
    outputHelper(file, 'data')
    setTimeout(() => {
      try {
        expect(fs.readFileSync(path, 'utf8')).toBe('data\r\n')
        done()
      } catch (err) {
        done.fail(err)
      }
    }, TIMEOUT)
  })

  it('output to not existed file', done => {
    const dummy = 'dummy.txt'
    outputHelper(dummy, 'data')
    setTimeout(() => {
      try {
        expect(spyError).toHaveBeenCalled()
        expect(spyError.mock.calls[0][0]).toContain('Cannot write file to')
        done()
      } catch (err) {
        done.fail(err)
      }
    }, TIMEOUT)
  })

  it('output to write stream', done => {
    const writeable = fs.createWriteStream(path)
    outputHelper(writeable, 'data_stream')
    setTimeout(() => {
      try {
        expect(fs.readFileSync(path, 'utf8')).toBe('data_stream\r\n')
        done()
      } catch (err) {
        done.fail(err)
      }
    }, TIMEOUT)
  })
})