testUtil.js

import {
  jest
} from '@jest/globals'
import {
  Readable,
  Writable
} from 'stream'

export default class TestUtil {

  static generateReadableStream(data) {
    return new Readable({
      read() {
        for(const item of data) {
          this.push(item)
        }

        this.push(null)
      }
    })
  }

  static generateWritableStream(onData) {
    return new Writable({
      write(chunk, enc, cb) {
        onData(chunk)

        cb(null, chunk)
      }
    })
  }

  static defaultHandleParams() {
    const requestStream = TestUtil.generateReadableStream(['body da requisicao'])
    const response = TestUtil.generateWritableStream(() => {})
    const data = {
      request: Object.assign(requestStream, {
        headers: {},
        method: '',
        url: ''
      }),
      response: Object.assign(response, {
        writeHead: jest.fn(),
        end: jest.fn()
      })
    }

    return {
      values: () => Object.values(data),
      ...data,
    }
  }
}