feat: add comprehensive unit and integration testing infrastructure

- Backend: pytest with unit tests (auth, rbac, config) and integration tests (auth flow, docker, files)
- Frontend: vitest with unit tests (api client) and component tests (login)
- CI: Gitea Actions workflow for automated testing with coverage reports
- Documentation: TESTING.md guide with setup, usage, and best practices
- Coverage goals: 80%+ backend, 70%+ frontend

dashboard/frontend/tests/components/Login.test.js

@@ -0,0 +1,50 @@
+/**
+ * Component tests for Login.svelte
+ */
+import { describe, it, expect, beforeEach, vi } from 'vitest';
+import { render, screen, fireEvent } from '@testing-library/svelte';
+import Login from '../../src/routes/Login.svelte';
+
+// Mock the API module
+vi.mock('../../src/lib/api.js', () => ({
+  login: vi.fn(),
+  setToken: vi.fn(),
+  setCurrentUser: vi.fn(),
+}));
+
+describe('Login Component', () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  it('should render login form', () => {
+    render(Login);
+
+    // Check for username and password inputs
+    expect(screen.getByLabelText(/username/i) || screen.getByPlaceholderText(/username/i)).toBeTruthy();
+    expect(screen.getByLabelText(/password/i) || screen.getByPlaceholderText(/password/i)).toBeTruthy();
+  });
+
+  it('should have login button', () => {
+    render(Login);
+
+    const loginButton = screen.getByRole('button', { name: /login/i }) ||
+                        screen.getByText(/login/i);
+    expect(loginButton).toBeTruthy();
+  });
+
+  it('should accept user input', async () => {
+    render(Login);
+
+    const usernameInput = screen.getByLabelText(/username/i) ||
+                          screen.getByPlaceholderText(/username/i);
+    const passwordInput = screen.getByLabelText(/password/i) ||
+                          screen.getByPlaceholderText(/password/i);
+
+    await fireEvent.input(usernameInput, { target: { value: 'testuser' } });
+    await fireEvent.input(passwordInput, { target: { value: 'testpass' } });
+
+    expect(usernameInput.value).toBe('testuser');
+    expect(passwordInput.value).toBe('testpass');
+  });
+});