import { moveSnake, Direction } from '@/lib/game/gameLogic';
import { Position } from '@/lib/game/types';

describe('moveSnake', () => {
  it('should move snake in specified direction', () => {
    const snake: Position[] = [{ x: 5, y: 5 }];
    const result = moveSnake(snake, Direction.RIGHT);
    
    expect(result[0]).toEqual({ x: 6, y: 5 });
    expect(snake[0].x).toBe(5); // Original unchanged
  });
});

import { render, screen } from '@testing-library/react';
import { GameCanvas } from '@/components/Game/GameCanvas';
import { createInitialState } from '@/lib/game/gameLogic';

describe('GameCanvas', () => {
  it('should render canvas element', () => {
    const gameState = createInitialState();
    render(<GameCanvas gameState={gameState} cellSize={20} gridSize={20} />);
    
    const canvas = screen.getByRole('img');
    expect(canvas).toBeInTheDocument();
  });
});

beforeAll(() => {
  HTMLCanvasElement.prototype.getContext = jest.fn(() => ({
    fillRect: jest.fn(),
    clearRect: jest.fn(),
    beginPath: jest.fn(),
    arc: jest.fn(),
    fill: jest.fn(),
    moveTo: jest.fn(),
    lineTo: jest.fn(),
    stroke: jest.fn(),
    fillStyle: '',
  }));
});

import { renderHook, act } from '@testing-library/react';
import { useGameLoop } from '@/lib/hooks/useGameLoop';

describe('useGameLoop', () => {
  it('should call callback at specified FPS', () => {
    jest.useFakeTimers();
    const callback = jest.fn();
    
    renderHook(() => useGameLoop(60, callback));
    
    act(() => {
      jest.advanceTimersByTime(1000);
    });
    
    expect(callback).toHaveBeenCalled();
    jest.useRealTimers();
  });
});

import { render, fireEvent } from '@testing-library/react';
import Page from '@/app/page';

describe('Snake Game Integration', () => {
  it('should handle full game flow', () => {
    const { getByText } = render(<Page />);
    
    // Start game
    const startButton = getByText(/start/i);
    fireEvent.click(startButton);
    
    // Simulate key press
    fireEvent.keyDown(window, { key: 'ArrowRight' });
    
    // Verify game state updated
    expect(getByText(/score/i)).toBeInTheDocument();
  });
});