Add duckduckgo search tool (#32882)

* Add duckduckgo search tool

tests/agents/test_search.py

@@ -0,0 +1,30 @@
+# coding=utf-8
+# Copyright 2024 HuggingFace Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import unittest
+
+from transformers import load_tool
+
+from .test_tools_common import ToolTesterMixin
+
+
+class DuckDuckGoSearchToolTester(unittest.TestCase, ToolTesterMixin):
+    def setUp(self):
+        self.tool = load_tool("web_search")
+        self.tool.setup()
+
+    def test_exact_match_arg(self):
+        result = self.tool("Agents")
+        assert isinstance(result, list) and isinstance(result[0], dict)