Add comprehensive unit tests for homepage components and utilities

- Introduced unit tests for homepage components: `QuickStartCode`, `Header`, `DemoCredentialsModal`, `AnimatedTerminal`, `CTASection`, and `StatsSection`.
- Added utility tests for `chart-colors` including opacity, palettes, and gradient validation.
- Mocked dependencies (`framer-motion`, `react-syntax-highlighter`, `DemoCredentialsModal`) for isolated testing.
- Verified accessibility features, animations, and interactive behaviors across components.

frontend/tests/components/home/HeroSection.test.tsx

@@ -0,0 +1,137 @@
+/**
+ * Tests for HeroSection component
+ */
+
+import { render, screen, fireEvent } from '@testing-library/react';
+import { HeroSection } from '@/components/home/HeroSection';
+
+// Mock framer-motion
+jest.mock('framer-motion', () => ({
+  motion: {
+    div: ({ children, ...props }: any) => <div {...props}>{children}</div>,
+    h1: ({ children, ...props }: any) => <h1 {...props}>{children}</h1>,
+    p: ({ children, ...props }: any) => <p {...props}>{children}</p>,
+  },
+}));
+
+// Mock Next.js Link
+jest.mock('next/link', () => ({
+  __esModule: true,
+  default: ({ children, href, ...props }: any) => {
+    return (
+      <a href={href} {...props}>
+        {children}
+      </a>
+    );
+  },
+}));
+
+// Mock DemoCredentialsModal
+jest.mock('@/components/home/DemoCredentialsModal', () => ({
+  DemoCredentialsModal: ({ open, onClose }: any) => (
+    open ? <div data-testid="demo-modal">
+      <button onClick={onClose}>Close Modal</button>
+    </div> : null
+  ),
+}));
+
+describe('HeroSection', () => {
+  it('renders badge with key highlights', () => {
+    render(<HeroSection />);
+
+    expect(screen.getByText('MIT Licensed')).toBeInTheDocument();
+    expect(screen.getAllByText('97% Test Coverage')[0]).toBeInTheDocument();
+    expect(screen.getByText('Production Ready')).toBeInTheDocument();
+  });
+
+  it('renders main headline', () => {
+    render(<HeroSection />);
+
+    expect(screen.getAllByText(/Everything You Need to Build/i)[0]).toBeInTheDocument();
+    expect(screen.getAllByText(/Modern Web Applications/i)[0]).toBeInTheDocument();
+  });
+
+  it('renders subheadline with key messaging', () => {
+    render(<HeroSection />);
+
+    expect(screen.getByText(/Production-ready FastAPI \+ Next.js template/i)).toBeInTheDocument();
+    expect(screen.getByText(/Start building features on day one/i)).toBeInTheDocument();
+  });
+
+  it('renders Try Live Demo button', () => {
+    render(<HeroSection />);
+
+    const demoButton = screen.getByRole('button', { name: /try live demo/i });
+    expect(demoButton).toBeInTheDocument();
+  });
+
+  it('renders View on GitHub link', () => {
+    render(<HeroSection />);
+
+    const githubLink = screen.getByRole('link', { name: /view on github/i });
+    expect(githubLink).toHaveAttribute('href', 'https://github.com/your-org/fast-next-template');
+    expect(githubLink).toHaveAttribute('target', '_blank');
+    expect(githubLink).toHaveAttribute('rel', 'noopener noreferrer');
+  });
+
+  it('renders Explore Components link', () => {
+    render(<HeroSection />);
+
+    const componentsLink = screen.getByRole('link', { name: /explore components/i });
+    expect(componentsLink).toHaveAttribute('href', '/dev');
+  });
+
+  it('displays test coverage stats', () => {
+    render(<HeroSection />);
+
+    const coverageTexts = screen.getAllByText('97%');
+    expect(coverageTexts.length).toBeGreaterThan(0);
+
+    const testCountTexts = screen.getAllByText('743');
+    expect(testCountTexts.length).toBeGreaterThan(0);
+    expect(screen.getAllByText(/Passing Tests/i)[0]).toBeInTheDocument();
+
+    expect(screen.getByText('0')).toBeInTheDocument();
+    expect(screen.getByText(/Flaky Tests/i)).toBeInTheDocument();
+  });
+
+  it('opens demo modal when Try Live Demo button is clicked', () => {
+    render(<HeroSection />);
+
+    const demoButton = screen.getByRole('button', { name: /try live demo/i });
+    fireEvent.click(demoButton);
+
+    expect(screen.getByTestId('demo-modal')).toBeInTheDocument();
+  });
+
+  it('closes demo modal when close is called', () => {
+    render(<HeroSection />);
+
+    // Open modal
+    const demoButton = screen.getByRole('button', { name: /try live demo/i });
+    fireEvent.click(demoButton);
+    expect(screen.getByTestId('demo-modal')).toBeInTheDocument();
+
+    // Close modal
+    const closeButton = screen.getByText('Close Modal');
+    fireEvent.click(closeButton);
+    expect(screen.queryByTestId('demo-modal')).not.toBeInTheDocument();
+  });
+
+  describe('Accessibility', () => {
+    it('has proper heading hierarchy', () => {
+      render(<HeroSection />);
+
+      const heading = screen.getAllByRole('heading', { level: 1 })[0];
+      expect(heading).toBeInTheDocument();
+    });
+
+    it('has proper external link attributes', () => {
+      render(<HeroSection />);
+
+      const githubLink = screen.getByRole('link', { name: /view on github/i });
+      expect(githubLink).toHaveAttribute('target', '_blank');
+      expect(githubLink).toHaveAttribute('rel', 'noopener noreferrer');
+    });
+  });
+});