nEngine/packages/render/test/keys.test.ts

import { describe, expect, it } from "vitest";
import { arrowDirection } from "../src/keys.js";

describe("arrowDirection (raw input → adjacent tile delta)", () => {
  it("maps the four arrow keys to grid deltas", () => {
    expect(arrowDirection("key:ArrowUp")).toEqual({ dx: 0, dy: -1 });
    expect(arrowDirection("key:ArrowDown")).toEqual({ dx: 0, dy: 1 });
    expect(arrowDirection("key:ArrowLeft")).toEqual({ dx: -1, dy: 0 });
    expect(arrowDirection("key:ArrowRight")).toEqual({ dx: 1, dy: 0 });
  });

  it("rejects non-arrow and malformed inputs", () => {
    expect(arrowDirection("key:Space")).toBeUndefined();
    expect(arrowDirection("pointer:click:1:2")).toBeUndefined();
    expect(arrowDirection("key:")).toBeUndefined();
    expect(arrowDirection("")).toBeUndefined();
  });
});