import { describe, expect, it } from "vitest";
import { tickets } from "./latest";

describe("tickets", () => {
  it("treats the only ticket taken as the newest", () => {
    const t = tickets();
    const a = t.take();
    expect(t.isLatest(a)).toBe(true);
  });
  it("treats an older ticket as out of date once a newer one is taken", () => {
    const t = tickets();
    const older = t.take();
    const newer = t.take();
    expect(t.isLatest(older)).toBe(false);
    expect(t.isLatest(newer)).toBe(true);
  });
  it("keeps an older ticket out of date after more tickets are taken", () => {
    const t = tickets();
    const first = t.take();
    t.take();
    const last = t.take();
    expect(t.isLatest(first)).toBe(false);
    expect(t.isLatest(last)).toBe(true);
  });
  it("keeps separate sets of tickets apart", () => {
    const a = tickets();
    const b = tickets();
    const fromA = a.take();
    b.take();
    b.take();
    expect(a.isLatest(fromA)).toBe(true);
  });
});