test/parallel/test-vm-create-and-run-in-context.js

// Copyright Joyent, Inc. and other Node contributors.
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'use strict';
// Flags: --expose-gc
require('../common');
const assert = require('assert');

const vm = require('vm');

// Run in a new empty context
let context = vm.createContext();
let result = vm.runInContext('"passed";', context);
assert.strictEqual(result, 'passed');

// Create a new pre-populated context
context = vm.createContext({ 'foo': 'bar', 'thing': 'lala' });
assert.strictEqual(context.foo, 'bar');
assert.strictEqual(context.thing, 'lala');

// Test updating context
result = vm.runInContext('var foo = 3;', context);
assert.strictEqual(context.foo, 3);
assert.strictEqual(context.thing, 'lala');

// https://github.com/nodejs/node/issues/5768
// Run in contextified sandbox without referencing the context
const sandbox = { x: 1 };
vm.createContext(sandbox);
global.gc();
vm.runInContext('x = 2', sandbox);
// Should not crash.