nes-emu/ppu/registers/OAMData.spec.js

A NES emulator

"use strict";

var _createTestContext = _interopRequireDefault(require("../../helpers/createTestContext"));
function _interopRequireDefault(e) { return e && e.__esModule ? e : { default: e }; }
const should = require("chai").Should();
const ADDRESS = 0x2004;
describe("CPU/PPU registers interaction", () => {
  describe("OAMData", () => {
    let ppu, memory, register;
    beforeEach(() => {
      ({
        ppu,
        memory
      } = (0, _createTestContext.default)());
      register = ppu.registers.oamData;
    });
    it("can write OAM, incrementing OAMAddr", () => {
      ppu.registers.oamAddr.setValue(3);
      memory.writeAt(ADDRESS, 24);
      ppu.oamRam[3].should.equal(24);
      ppu.registers.oamAddr.value.should.equal(4);
    });
    it("can read OAM", () => {
      ppu.oamRam[3] = 84;
      ppu.registers.oamAddr.setValue(3);
      memory.readAt(ADDRESS).should.equal(84);
    });
  });
});