ApiCore/ApiCore-Backend/src/health/health.controller.spec.ts

import { ServiceUnavailableException } from '@nestjs/common';
import { HealthController } from './health.controller';
import { PrismaService } from '../prisma/prisma.service';

describe('HealthController', () => {
  let controller: HealthController;
  let prisma: { $queryRaw: jest.Mock };

  beforeEach(() => {
    prisma = { $queryRaw: jest.fn() };
    controller = new HealthController(prisma as unknown as PrismaService);
  });

  it('liveness returns ok without touching the database', () => {
    expect(controller.liveness()).toEqual({ status: 'ok' });
    expect(prisma.$queryRaw).not.toHaveBeenCalled();
  });

  it('readiness returns ok when the database responds', async () => {
    prisma.$queryRaw.mockResolvedValueOnce([{ '?column?': 1 }]);
    await expect(controller.readiness()).resolves.toEqual({ status: 'ok' });
  });

  it('readiness throws ServiceUnavailableException when the database is unreachable', async () => {
    prisma.$queryRaw.mockRejectedValueOnce(new Error('connection refused'));
    await expect(controller.readiness()).rejects.toBeInstanceOf(
      ServiceUnavailableException,
    );
  });
});