feat: Add test infrastructure with Jest and Playwright for Chromium

tests/integration/example.spec.js

@@ -0,0 +1,17 @@
+/**
+ * Example Playwright tests for the 3D Flight Simulator project
+ */
+
+const { test, expect } = require('@playwright/test');
+
+test('should display loading screen', async ({ page }) => {
+  await page.goto('/');
+  await expect(page).toHaveTitle(/3D Flight Simulator/);
+  await expect(page.locator('.loading-screen')).toBeVisible();
+});
+
+test('should navigate to intro screen', async ({ page }) => {
+  await page.goto('/');
+  await page.click('.start-button');
+  await expect(page.locator('.intro-screen')).toBeVisible();
+});

tests/unit/example.test.js

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+/**
+ * Example unit tests for the 3D Flight Simulator project
+ */
+
+describe('Math utilities', () => {
+  it('should add two numbers', () => {
+    const result = 2 + 3;
+    expect(result).toBe(5);
+  });
+
+  it('should subtract two numbers', () => {
+    const result = 5 - 2;
+    expect(result).toBe(3);
+  });
+
+  it('should multiply two numbers', () => {
+    const result = 3 * 4;
+    expect(result).toBe(12);
+  });
+});

tests/unit/setup.js

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+/**
+ * Jest setup file
+ * This file runs before any tests are executed
+ */
+
+// Add any global setup here
+// For example: mocking global objects, setting up test environment, etc.
+
+// Example: Mock localStorage
+const localStorageMock = (() => {
+  let store = {};
+  return {
+    getItem: (key) => store[key] || null,
+    setItem: (key, value) => {
+      store[key] = value.toString();
+    },
+    removeItem: (key) => {
+      delete store[key];
+    },
+    clear: () => {
+      store = {};
+    },
+  };
+})();
+
+Object.defineProperty(window, 'localStorage', {
+  value: localStorageMock,
+});
+
+// Example: Mock sessionStorage
+const sessionStorageMock = (() => {
+  let store = {};
+  return {
+    getItem: (key) => store[key] || null,
+    setItem: (key, value) => {
+      store[key] = value.toString();
+    },
+    removeItem: (key) => {
+      delete store[key];
+    },
+    clear: () => {
+      store = {};
+    },
+  };
+})();
+
+Object.defineProperty(window, 'sessionStorage', {
+  value: sessionStorageMock,
+});