// test262 API
// https://github.com/dckc/test262/blob/master/INTERPRETING.md#host-defined-functions
function print(x) {
    console.log('R0: ', x);  // prefix with realmId for clarity
}

const $ = (
    function() {
        'use strict';

        const vm = require('vm');

        const notImplemented = () => { throw("not implemented. not needed for this test."); };
        let nextRealmId = 1;

        function createRealm() {
            const realmId = nextRealmId++;

            const global = {};
            const context = vm.createContext(global);

            const $ = Object.freeze({
                createRealm: createRealm,
                detachArrayBuffer: notImplemented,
                evalScript: script => vm.runInContext(
                    script, context, { filename: `realm${realmId}`, lineOffset: /*see below*/ 47 }),
                global: global
            });
            // print and $ must be "writable, configurable, non-enumerable properties of the global scope".
            // Does this code do so?
            global.print = x => console.log(`R${realmId}: `, x);
            global.$ = $;

            return $;
        }

        return Object.freeze({
            createRealm: createRealm,
            detachArrayBuffer: notImplemented,
            evalScript: script => notImplemented,
            global: this
        });
    })();

// test case starts on line 47
var script = '(' + function () {
    'use strict';

    $.global.x = 10;
    Object.defineProperty($.global, 'x', {
        writable: false,
        enumerable: false,
        configurable: false,
        value: 20
    });
    try {
        x = 30;
    } catch (e) {
        print(e);
    }
    print(x); // should be 20
    print(Object.getOwnPropertyDescriptor($.global, 'x'));
} + ')()';

var context_$ = $.createRealm();
context_$.evalScript(script);