nes-emu/helpers/WithContext.spec.js

A NES emulator

"use strict";

var _WithContext = _interopRequireDefault(require("./WithContext"));
function _interopRequireDefault(e) { return e && e.__esModule ? e : { default: e }; }
const should = require("chai").Should();
describe("helpers", () => {
  describe("WithContext", () => {
    let state, target;
    beforeEach(() => {
      state = null;
      target = {
        onLoad() {
          state = 100;
        }
      };
      _WithContext.default.apply(target);
    });
    it("should set the context property on loadContext", () => {
      target.loadContext({
        some: "thing"
      });
      target.context.should.eql({
        some: "thing"
      });
    });
    it("has a requireContext that checks if it's loaded", () => {
      (() => target.requireContext()).should.throw("Execution context not found.");
    });
    it("calls the onLoad method", () => {
      target.loadContext({});
      state.should.equal(100);
    });
    it("it works without an onLoad method", () => {
      target.onLoad = undefined;
      (() => target.loadContext({})).should.not.throw(Error);
    });
  });
});