number-name/tests/Converter.test.ts

import fs from 'fs'
import Converter from '../src'
import English from '../src/systems/en'

describe.each`
  name         | system     | scale
  ${'English'} | ${English} | ${'short'}
  ${'English'} | ${English} | ${'long'}
`('$name ($scale count)', ({ system, scale, }) => {
  let converter: Converter

  beforeAll(() => {
    converter = new Converter(system)
  })

  describe('on values', () => {
    test.each`
    value        | name
    ${1000000}   | ${'one million'}
    ${123456789} | ${'one hundred twenty three million four hundred fifty six thousand seven hundred eighty nine'}
  `('should parse $value as $name', ({ value, name, }) => {
      expect(converter.convert(value, { scale })).toBe(name)
    })
  })

  describe('on streams', () => {
    const ENCODING = 'utf-8'

    test.each([
      'million.txt'
    ])('should correctly parse a stream', async (filename) => {
      const inputStream = fs.createReadStream(
        `./tests/input/${filename}`,
        {
          encoding: ENCODING,
          highWaterMark: 3, // this is required to parse kilos correctly
        }
      )
      const readStream = converter.readStream({
        scale,
        encoding: ENCODING
      })
      inputStream
        .pipe(readStream)
        .pipe(fs.createWriteStream(`./tests/output/${filename}`))

      return new Promise((resolve) => {
        readStream.on('end', () => {
          resolve('Hello')
        })
      })
    })
  })
})