node/test/parallel/test-child-process-buffering.js

// Copyright Joyent, Inc. and other Node contributors.
//
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// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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// USE OR OTHER DEALINGS IN THE SOFTWARE.

'use strict';
const common = require('../common');
const assert = require('assert');

function pwd(callback) {
  let output = '';
  const child = common.spawnPwd();

  child.stdout.setEncoding('utf8');
  child.stdout.on('data', function(s) {
    console.log(`stdout: ${JSON.stringify(s)}`);
    output += s;
  });

  child.on('exit', common.mustCall(function(c) {
    console.log(`exit: ${c}`);
    assert.strictEqual(0, c);
  }));

  child.on('close', common.mustCall(function() {
    callback(output);
  }));
}


pwd(function(result) {
  console.dir(result);
  assert.strictEqual(true, result.length > 1);
  assert.strictEqual('\n', result[result.length - 1]);
});