adding unit tests

jest.config.js

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+const nextJest = require('next/jest')
+
+const createJestConfig = nextJest({
+  // Provide the path to your Next.js app to load next.config.js and .env files
+  dir: './',
+})
+
+const customJestConfig = {
+  setupFilesAfterEnv: ['<rootDir>/jest.setup.js'],
+  testEnvironment: 'jest-environment-jsdom',
+  collectCoverageFrom: [
+    'src/**/*.{js,jsx,ts,tsx}',
+    '!src/**/*.d.ts',
+    '!src/**/*.stories.{js,jsx,ts,tsx}',
+  ],
+  coverageThreshold: {
+    global: {
+      branches: 70,
+      functions: 70,
+      lines: 70,
+      statements: 70,
+    },
+  },
+}
+
+// createJestConfig is exported this way to ensure that next/jest can load the Next.js config which is async
+module.exports = createJestConfig(customJestConfig)

jest.setup.js

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+import '@testing-library/jest-dom'
+
+// Mock Next.js router
+jest.mock('next/navigation', () => ({
+  useRouter() {
+    return {
+      push: jest.fn(),
+      replace: jest.fn(),
+      prefetch: jest.fn(),
+      back: jest.fn(),
+      forward: jest.fn(),
+      refresh: jest.fn(),
+    }
+  },
+  useSearchParams() {
+    return new URLSearchParams()
+  },
+  usePathname() {
+    return '/'
+  },
+}))
+
+// Mock Next.js image component
+jest.mock('next/image', () => ({
+  __esModule: true,
+  default: function MockImage(props) {
+    return props
+  },
+}))
+
+// Global test utilities
+global.ResizeObserver = jest.fn().mockImplementation(() => ({
+  observe: jest.fn(),
+  unobserve: jest.fn(),
+  disconnect: jest.fn(),
+}))
+
+// Mock window.matchMedia
+Object.defineProperty(window, 'matchMedia', {
+  writable: true,
+  value: jest.fn().mockImplementation(query => ({
+    matches: false,
+    media: query,
+    onchange: null,
+    addListener: jest.fn(),
+    removeListener: jest.fn(),
+    addEventListener: jest.fn(),
+    removeEventListener: jest.fn(),
+    dispatchEvent: jest.fn(),
+  })),
+})