feat(doc/search): Enhance search functionality with filter and validate options for advanced query control

test/test.search.ts

@@ -276,6 +276,20 @@ tap.test('should support wildcard plain term with question mark pattern', async
   expect(names).toEqual(['Galaxy S21', 'iPhone 12']);
 });
 
+// Filter and Validation tests
+tap.test('should apply filter option to restrict results', async () => {
+  // search term 'book' across all fields but restrict to Books category
+  const bookFiltered = await Product.search('book', { filter: { category: 'Books' } });
+  expect(bookFiltered.length).toEqual(2);
+  bookFiltered.forEach((p) => expect(p.category).toEqual('Books'));
+});
+tap.test('should apply validate hook to post-filter results', async () => {
+  // return only products with price > 500
+  const expensive = await Product.search('', { validate: (p) => p.price > 500 });
+  expect(expensive.length).toBeGreaterThan(0);
+  expensive.forEach((p) => expect(p.price).toBeGreaterThan(500));
+});
+
 // Close database connection
 tap.test('close database connection', async () => {
   await testDb.mongoDb.dropDatabase();