nes-emu/memory/RewiredMemoryChunk.spec.js

A NES emulator

"use strict";

var _RewiredMemoryChunk = _interopRequireDefault(require("./RewiredMemoryChunk"));
function _interopRequireDefault(e) { return e && e.__esModule ? e : { default: e }; }
const should = require("chai").Should();
describe("memory", () => {
  describe("RewiredMemoryChunk", () => {
    let rewiredChunk;
    beforeEach(() => {
      rewiredChunk = new _RewiredMemoryChunk.default(0x20, {
        0x10: 0x00,
        0x14: 0x04,
        0x18: 0x08,
        0x1c: 0x0c
      });
    });
    it("read and write bytes normally", () => {
      rewiredChunk.writeAt(0x02, 123);
      rewiredChunk.readAt(0x02).should.equal(123);
    });
    it("translates read operations using mapping", () => {
      rewiredChunk.writeAt(0x04, 123);
      rewiredChunk.readAt(0x14).should.equal(123);
    });
    it("translates write operations using mapping", () => {
      rewiredChunk.writeAt(0x18, 123);
      rewiredChunk.readAt(0x08).should.equal(123);
    });
    it("can create a mapping from a range list", () => {
      _RewiredMemoryChunk.default.createMapping([{
        from: 10,
        size: 5,
        to: 1
      }]).should.eql({
        10: 1,
        11: 2,
        12: 3,
        13: 4,
        14: 5
      });
    });
  });
});