const request = require('supertest');
const app = require('./index');

describe('Backend API', () => {
  it('should return health check message on /', async () => {
    const res = await request(app).get('/');
    expect(res.statusCode).toEqual(200);
    expect(res.text).toContain('Todo API is running');
  });

  it('should fetch all todos', async () => {
    const res = await request(app).get('/api/todos');
    expect(res.statusCode).toEqual(200);
    expect(Array.isArray(res.body)).toBeTruthy();
    expect(res.body.length).toBeGreaterThanOrEqual(2);
  });

  it('should add a new todo', async () => {
    const newTodo = { task: 'Test task' };
    const res = await request(app)
      .post('/api/todos')
      .send(newTodo);
    expect(res.statusCode).toEqual(201);
    expect(res.body.task).toEqual('Test task');
    expect(res.body).toHaveProperty('id');
  });

  it('should fail to add a todo without a task', async () => {
    const res = await request(app)
      .post('/api/todos')
      .send({});
    expect(res.statusCode).toEqual(400);
    expect(res.body.error).toEqual('Task is required');
  });
});