fix(lucene adapter and search tests): Improve range query parsing in Lucene adapter and expand search test coverage

test/test.search.ts

@@ -257,6 +257,26 @@ tap.test('should search hyphenated terms "E-reader"', async () => {
   expect(ereaderResults[0].name).toEqual('Kindle Paperwhite');
 });
 
+// Additional robustness tests
+tap.test('should return all products for empty search', async () => {
+  const searchResults = await Product.search('');
+  const allProducts = await Product.getInstances({});
+  expect(searchResults.length).toEqual(allProducts.length);
+});
+
+tap.test('should support wildcard plain term across all fields', async () => {
+  const results = await Product.search('*book*');
+  const names = results.map((r) => r.name).sort();
+  expect(names).toEqual(['Harry Potter', 'Kindle Paperwhite', 'MacBook Pro']);
+});
+
+tap.test('should support wildcard plain term with question mark pattern', async () => {
+  const results = await Product.search('?one?');
+  const names = results.map((r) => r.name).sort();
+  expect(names).toEqual(['Galaxy S21', 'iPhone 12']);
+});
+
+// Close database connection
 tap.test('close database connection', async () => {
   await testDb.mongoDb.dropDatabase();
   await testDb.close();