feat: Add test infrastructure with Jest and Playwright for Chromium

tests/unit/setup.js

@@ -0,0 +1,49 @@
+/**
+ * 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,
+});