chore: Add toolbox tool unit test cases

Author: anubhav756

packages/toolbox-core/tests/test_client.py

@@ -413,8 +413,7 @@ async def test_load_tool_not_found_in_manifest(aioresponses, test_tool_str):
     REQUESTED_TOOL_NAME = "non_existent_tool_xyz"
 
     manifest = ManifestSchema(
-        serverVersion="0.0.0",
-        tools={ACTUAL_TOOL_IN_MANIFEST: test_tool_str}
+        serverVersion="0.0.0", tools={ACTUAL_TOOL_IN_MANIFEST: test_tool_str}
     )
 
     aioresponses.get(
@@ -428,5 +427,5 @@ async def test_load_tool_not_found_in_manifest(aioresponses, test_tool_str):
             await client.load_tool(REQUESTED_TOOL_NAME)
 
     aioresponses.assert_called_once_with(
-        f"{TEST_BASE_URL}/api/tool/{REQUESTED_TOOL_NAME}", method='GET'
-    )
+        f"{TEST_BASE_URL}/api/tool/{REQUESTED_TOOL_NAME}", method="GET"
+    )

packages/toolbox-core/tests/test_tools.py

@@ -0,0 +1,29 @@
+# Copyright 2025 Google LLC
+#
+# 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.
+
+
+from toolbox_core.tool import create_docstring
+
+
+def test_create_docstring_no_params():
+    """
+    Tests create_docstring when the params list is empty.
+    """
+    description = "This is a tool description."
+    params = []
+
+    result_docstring = create_docstring(description, params)
+
+    assert result_docstring == description
+    assert "\n\nArgs:" not in result_docstring