Adds missing unit tests (Issue #4623)

src/google/adk/examples/example_util.py

@@ -46,7 +46,6 @@
 _FUNCTION_RESPONSE_SUFFIX = "\n```\n"
 
 
-# TODO(yaojie): Add unit tests for this function.
 def convert_examples_to_text(
     examples: list[Example], model: Optional[str]
 ) -> str:

tests/unittests/examples/__init__.py

@@ -0,0 +1,13 @@
+# Copyright 2026 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.