text: // Flags: --expose-internals
  'use strict';
  const common = require('../common');
  const assert = require('assert');
  
  const { outHeadersKey } = require('internal/http');
  const { OutgoingMessage } = require('http');
  
  {
    // tests for _headers get method
    const outgoingMessage = new OutgoingMessage();
    outgoingMessage.getHeaders = common.mustCall();
    outgoingMessage._headers;
  }
  
  {
    // tests for _headers set method
    const outgoingMessage = new OutgoingMessage();
    outgoingMessage._headers = {
      host: 'risingstack.com',
      Origin: 'localhost'
    };
  
    assert.deepStrictEqual(outgoingMessage[outHeadersKey], {
      host: ['host', 'risingstack.com'],
      origin: ['Origin', 'localhost']
    });
  }
  