import { describe, it, expect, beforeEach } from "vitest";
import { nextTheme, getInitialTheme } from "./theme.js";

describe("nextTheme", () => {
  it("bascule dark <-> light", () => {
    expect(nextTheme("dark")).toBe("light");
    expect(nextTheme("light")).toBe("dark");
  });
});

describe("getInitialTheme", () => {
  beforeEach(() => {
    // @ts-expect-error - environnement node sans localStorage
    delete globalThis.localStorage;
  });
  it("retombe sur dark sans localStorage", () => {
    expect(getInitialTheme()).toBe("dark");
  });
  it("lit la valeur persistée si présente", () => {
    const store: Record<string, string> = { "su-theme": "light" };
    // @ts-expect-error - stub minimal
    globalThis.localStorage = { getItem: (k: string) => store[k] ?? null };
    expect(getInitialTheme()).toBe("light");
  });
});