advent22/ui/tests/unit/vector2d.spec.ts

import { expect } from "chai";

import { Vector2D } from "@/lib/rects/vector2d";

describe("Vector2D Tests", () => {
  const v = new Vector2D(1, 2);

  it("should create a default vector", () => {
    const v0 = new Vector2D();
    expect(v0.x).to.equal(0);
    expect(v0.y).to.equal(0);
  });

  it("should create a vector", () => {
    expect(v.x).to.equal(1);
    expect(v.y).to.equal(2);
  });

  it("should add vectors", () => {
    const v2 = v.plus(new Vector2D(3, 4));
    expect(v2.x).to.equal(4);
    expect(v2.y).to.equal(6);
  });

  it("should subtract vectors", () => {
    const v2 = v.minus(new Vector2D(3, 4));
    expect(v2.x).to.equal(-2);
    expect(v2.y).to.equal(-2);
  });

  it("should scale vectors", () => {
    const v2 = v.scale(3);
    expect(v2.x).to.equal(3);
    expect(v2.y).to.equal(6);
  });

  it("should compare vectors", () => {
    expect(v.equals(v.scale(1))).to.be.true;
    expect(v.equals(v.scale(2))).to.be.false;
  });
});