causalityjs/test/overlay.js

A library for reactive programming based on Javascript proxies.

'use strict';
require = require("esm")(module);
const causality = require("../causality.js");
const assert = require('assert');

describe("Overlays", function(){

  it('testing', function () {
    // Simple object
    // console.log(" Simple object ===========================")
    let x = causality.create({name: "original"});
    x.foo = 1;
    assert.equal(x.foo, 1);

    // Create overlay
    // console.log(" Create overlay ===========================")
    let xOverlay = causality.create({ name: "overlay"});
    x.__handler.overrides.__overlay = xOverlay;
    // console.log(x.__handler);
    // console.log(x.__handler.overrides);
    // console.log(x);
    // console.log(x.__overlay);
    // console.log(x.__handler);
    // console.log(x.foo);
    assert.equal(typeof(x.foo), 'undefined');

    // Make changes in overlay
    // console.log(" Make changes in overlay ===========================")
    x.foo = 42;
    x.fie = 32;
    assert.equal(x.foo, 42);
    assert.equal(x.fie, 32);

    // Remove overlay
    x.__overlay = null;
    assert.equal(x.foo, 1);
    assert.equal(typeof(x.fie), 'undefined');
  });
});