SnapOtter/tests/unit/web/utils.test.ts

// @vitest-environment jsdom
import { afterEach, describe, expect, it, vi } from "vitest";
import { copyToClipboard, generateId } from "../../../apps/web/src/lib/utils";

describe("generateId", () => {
  it("returns a valid UUID v4 string", () => {
    const id = generateId();
    expect(id).toMatch(/^[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/);
  });

  it("returns unique values on successive calls", () => {
    const ids = new Set(Array.from({ length: 100 }, () => generateId()));
    expect(ids.size).toBe(100);
  });
});

describe("copyToClipboard", () => {
  const originalClipboard = navigator.clipboard;
  const originalExecCommand = document.execCommand;

  afterEach(() => {
    Object.assign(navigator, { clipboard: originalClipboard });
    document.execCommand = originalExecCommand;
    vi.restoreAllMocks();
  });

  it("returns true when clipboard API succeeds", async () => {
    Object.assign(navigator, {
      clipboard: { writeText: vi.fn().mockResolvedValue(undefined) },
    });
    expect(await copyToClipboard("hello")).toBe(true);
    expect(navigator.clipboard.writeText).toHaveBeenCalledWith("hello");
  });

  it("falls back to execCommand when clipboard API fails", async () => {
    Object.assign(navigator, { clipboard: undefined });
    document.execCommand = vi.fn().mockReturnValue(true);
    expect(await copyToClipboard("hello")).toBe(true);
    expect(document.execCommand).toHaveBeenCalledWith("copy");
  });

  it("returns false when both approaches fail", async () => {
    Object.assign(navigator, { clipboard: undefined });
    document.execCommand = vi.fn().mockImplementation(() => {
      throw new Error("not supported");
    });
    expect(await copyToClipboard("hello")).toBe(false);
  });
});