node/test/simple/test-deprecation-flags.js

// Copyright Joyent, Inc. and other Node contributors.
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var common = require('../common');
var assert = require('assert');
var execFile = require('child_process').execFile;
var depmod = require.resolve('../fixtures/deprecated.js');
var node = process.execPath;

var normal = [depmod];
var noDep = ['--no-deprecation', depmod];
var traceDep = ['--trace-deprecation', depmod];

execFile(node, normal, function(er, stdout, stderr) {
  console.error('normal: show deprecation warning');
  assert.equal(er, null);
  assert.equal(stdout, '');
  assert.equal(stderr, 'util.p: Use console.error() instead\n\'This is deprecated\'\n');
  console.log('normal ok');
});

execFile(node, noDep, function(er, stdout, stderr) {
  console.error('--no-deprecation: silence deprecations');
  assert.equal(er, null);
  assert.equal(stdout, '');
  assert.equal(stderr, '\'This is deprecated\'\n');
  console.log('silent ok');
});

execFile(node, traceDep, function(er, stdout, stderr) {
  console.error('--trace-deprecation: show stack');
  assert.equal(er, null);
  assert.equal(stdout, '');
  var stack = stderr.trim().split('\n');
  // just check the top and bottom.
  assert.equal(stack[0], 'Trace: util.p: Use console.error() instead');
  assert.equal(stack.pop(), '\'This is deprecated\'');
  console.log('trace ok');
});