test/parallel/test-buffer-constructor-outside-node-modules.js

// Flags: --no-warnings
'use strict';

const common = require('../common');
const vm = require('vm');
const assert = require('assert');

if (new Error().stack.includes('node_modules'))
  common.skip('test does not work when inside `node_modules` directory');
if (process.env.NODE_PENDING_DEPRECATION)
  common.skip('test does not work when NODE_PENDING_DEPRECATION is set');

const bufferWarning = 'Buffer() is deprecated due to security and usability ' +
                      'issues. Please use the Buffer.alloc(), ' +
                      'Buffer.allocUnsafe(), or Buffer.from() methods instead.';

process.addListener('warning', common.mustCall((warning) => {
  assert(warning.stack.includes('this_should_emit_a_warning'), warning.stack);
}));

vm.runInNewContext('new Buffer(10)', { Buffer }, {
  filename: '/a/node_modules/b'
});

common.expectWarning('DeprecationWarning', bufferWarning, 'DEP0005');

vm.runInNewContext('new Buffer(10)', { Buffer }, {
  filename: '/this_should_emit_a_warning'
});