import * as fs from 'node:fs/promises';
import { resolvePromtoolPath } from './infrastructure-alert-settings.service';

jest.mock('node:fs/promises', () => ({ ...jest.requireActual('node:fs/promises'), access: jest.fn() }));

describe('Prometheus binary resolution', () => {
  beforeEach(() => jest.resetAllMocks());
  it('uses the official installer location when available', async () => {
    const check = jest.mocked(fs.access).mockResolvedValue(undefined);
    expect(await resolvePromtoolPath()).toBe('/usr/local/bin/promtool');
    expect(check).toHaveBeenCalledTimes(1);
  });
  it('supports the distribution package location', async () => {
    jest.mocked(fs.access).mockRejectedValueOnce(new Error('ENOENT')).mockResolvedValueOnce(undefined);
    expect(await resolvePromtoolPath()).toBe('/usr/bin/promtool');
  });
  it('fails rather than silently overriding an invalid explicitly configured binary', async () => {
    const check = jest.mocked(fs.access).mockRejectedValue(new Error('EACCES'));
    await expect(resolvePromtoolPath('/custom/promtool')).rejects.toThrow('promtool不可执行');
    expect(check).toHaveBeenCalledTimes(1);
  });
});