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import React from 'react';
import '@testing-library/jest-dom';
import { render, screen, fireEvent, waitFor } from '@testing-library/react';
import { BrowserRouter } from 'react-router-dom';
import { describe, it, expect, vi, beforeEach } from 'vitest';
import Login from './Login';
// Mock fetch
global.fetch = vi.fn();
const renderLogin = () => {
render(
<BrowserRouter>
<Login />
</BrowserRouter>
);
};
describe('Login Component', () => {
beforeEach(() => {
vi.resetAllMocks();
});
it('renders login form', () => {
renderLogin();
expect(screen.getByLabelText(/username/i)).toBeInTheDocument();
expect(screen.getByLabelText(/password/i)).toBeInTheDocument();
expect(screen.getByRole('button', { name: /login/i })).toBeInTheDocument();
});
it('handles successful login', async () => {
vi.mocked(global.fetch).mockResolvedValueOnce({
ok: true,
} as Response);
renderLogin();
fireEvent.change(screen.getByLabelText(/username/i), { target: { value: 'testuser' } });
fireEvent.change(screen.getByLabelText(/password/i), { target: { value: 'secret' } });
fireEvent.click(screen.getByRole('button', { name: /login/i }));
await waitFor(() => {
expect(global.fetch).toHaveBeenCalledWith(
'/api/login',
expect.objectContaining({
method: 'POST',
body: expect.any(URLSearchParams),
})
);
});
// Check if params contained username and password
const callArgs = vi.mocked(global.fetch).mock.calls[0][1];
const body = callArgs?.body as URLSearchParams;
expect(body.get('username')).toBe('testuser');
expect(body.get('password')).toBe('secret');
// Navigation assertion is tricky without mocking useNavigate,
// but if no error is shown, we assume success path was taken
expect(screen.queryByText(/login failed/i)).not.toBeInTheDocument();
});
it('handles failed login', async () => {
vi.mocked(global.fetch).mockResolvedValueOnce({
ok: false,
json: async () => ({ message: 'Bad credentials' }),
} as Response);
renderLogin();
fireEvent.change(screen.getByLabelText(/username/i), { target: { value: 'testuser' } });
fireEvent.change(screen.getByLabelText(/password/i), { target: { value: 'wrong' } });
fireEvent.click(screen.getByRole('button', { name: /login/i }));
await waitFor(() => {
expect(screen.getByText(/bad credentials/i)).toBeInTheDocument();
});
});
it('handles network error', async () => {
vi.mocked(global.fetch).mockRejectedValueOnce(new Error('Network error'));
renderLogin();
fireEvent.change(screen.getByLabelText(/username/i), { target: { value: 'testuser' } });
fireEvent.change(screen.getByLabelText(/password/i), { target: { value: 'secret' } });
fireEvent.click(screen.getByRole('button', { name: /login/i }));
await waitFor(() => {
expect(screen.getByText(/network error/i)).toBeInTheDocument();
});
});
});
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