import { beforeEach, describe, expect, it, vi } from "vitest";

const execFileMock = vi.hoisted(() => vi.fn());

vi.mock("node:child_process", () => ({
  execFile: execFileMock,
}));

import { isSystemdUserServiceAvailable } from "./systemd.js";

describe("systemd availability", () => {
  beforeEach(() => {
    execFileMock.mockReset();
  });

  it("returns true when systemctl --user succeeds", async () => {
    execFileMock.mockImplementation((_cmd, _args, _opts, cb) => {
      cb(null, "", "");
    });
    await expect(isSystemdUserServiceAvailable()).resolves.toBe(true);
  });

  it("returns false when systemd user bus is unavailable", async () => {
    execFileMock.mockImplementation((_cmd, _args, _opts, cb) => {
      const err = new Error("Failed to connect to bus") as Error & {
        stderr?: string;
        code?: number;
      };
      err.stderr = "Failed to connect to bus";
      err.code = 1;
      cb(err, "", "");
    });
    await expect(isSystemdUserServiceAvailable()).resolves.toBe(false);
  });
});