test: add unit tests for VertexAiExampleStore.get_examples

get_examples had no test coverage: the search request it builds, the
similarity-score filter, and the conversion of text, function_call and
function_response parts into Example objects were all untested. Add unit
tests with the example-store client mocked, so no network call is made.

Co-authored-by: George Weale <gweale@google.com>
PiperOrigin-RevId: 953977995

Author: GWeale

tests/unittests/examples/test_vertex_ai_example_store.py

@@ -0,0 +1,191 @@
+# 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.
+
+"""Tests for vertex_ai_example_store."""
+
+from types import SimpleNamespace
+from unittest import mock
+
+from google.adk.examples.vertex_ai_example_store import VertexAiExampleStore
+import pytest
+
+_STORE_NAME = "projects/p/locations/l/exampleStores/s"
+
+
+def _part(*, text=None, function_call=None, function_response=None):
+  return SimpleNamespace(
+      text=text,
+      function_call=function_call,
+      function_response=function_response,
+  )
+
+
+def _expected_content(*, role, parts):
+  return SimpleNamespace(content=SimpleNamespace(role=role, parts=parts))
+
+
+def _result(*, search_key="search key", expected_contents=(), score=1.0):
+  return SimpleNamespace(
+      similarity_score=score,
+      example=SimpleNamespace(
+          stored_contents_example=SimpleNamespace(
+              search_key=search_key,
+              contents_example=SimpleNamespace(
+                  expected_contents=list(expected_contents)
+              ),
+          )
+      ),
+  )
+
+
+@pytest.fixture
+def mock_example_stores():
+  with mock.patch(
+      "google.adk.dependencies.vertexai.example_stores"
+  ) as example_stores:
+    yield example_stores
+
+
+@pytest.fixture
+def search_examples(mock_example_stores):
+  return (
+      mock_example_stores.ExampleStore.return_value.api_client.search_examples
+  )
+
+
+def test_get_examples_searches_the_configured_store(
+    mock_example_stores, search_examples
+):
+  search_examples.return_value = SimpleNamespace(results=[])
+
+  VertexAiExampleStore(_STORE_NAME).get_examples("what is the weather?")
+
+  mock_example_stores.ExampleStore.assert_called_once_with(_STORE_NAME)
+  search_examples.assert_called_once_with({
+      "stored_contents_example_parameters": {
+          "content_search_key": {
+              "contents": [{
+                  "role": "user",
+                  "parts": [{"text": "what is the weather?"}],
+              }],
+              "search_key_generation_method": {"last_entry": {}},
+          }
+      },
+      "top_k": 10,
+      "example_store": _STORE_NAME,
+  })
+
+
+def test_get_examples_returns_empty_list_without_results(search_examples):
+  search_examples.return_value = SimpleNamespace(results=[])
+
+  assert VertexAiExampleStore(_STORE_NAME).get_examples("query") == []
+
+
+def test_get_examples_converts_text_part(search_examples):
+  search_examples.return_value = SimpleNamespace(
+      results=[
+          _result(
+              search_key="what is the weather?",
+              expected_contents=[
+                  _expected_content(
+                      role="model", parts=[_part(text="it is sunny")]
+                  )
+              ],
+          )
+      ]
+  )
+
+  examples = VertexAiExampleStore(_STORE_NAME).get_examples("query")
+
+  assert len(examples) == 1
+  assert examples[0].input.role == "user"
+  assert [part.text for part in examples[0].input.parts] == [
+      "what is the weather?"
+  ]
+  assert len(examples[0].output) == 1
+  assert examples[0].output[0].role == "model"
+  assert [part.text for part in examples[0].output[0].parts] == ["it is sunny"]
+
+
+def test_get_examples_filters_results_below_similarity_threshold(
+    search_examples,
+):
+  search_examples.return_value = SimpleNamespace(
+      results=[
+          _result(search_key="too dissimilar", score=0.49),
+          _result(search_key="similar enough", score=0.5),
+      ]
+  )
+
+  examples = VertexAiExampleStore(_STORE_NAME).get_examples("query")
+
+  assert [example.input.parts[0].text for example in examples] == [
+      "similar enough"
+  ]
+
+
+def test_get_examples_converts_function_call_part(search_examples):
+  search_examples.return_value = SimpleNamespace(
+      results=[
+          _result(
+              expected_contents=[
+                  _expected_content(
+                      role="model",
+                      parts=[
+                          _part(
+                              function_call=SimpleNamespace(
+                                  name="get_weather", args={"city": "London"}
+                              )
+                          )
+                      ],
+                  )
+              ],
+          )
+      ]
+  )
+
+  examples = VertexAiExampleStore(_STORE_NAME).get_examples("query")
+
+  function_call = examples[0].output[0].parts[0].function_call
+  assert function_call.name == "get_weather"
+  assert function_call.args == {"city": "London"}
+
+
+def test_get_examples_converts_function_response_part(search_examples):
+  search_examples.return_value = SimpleNamespace(
+      results=[
+          _result(
+              expected_contents=[
+                  _expected_content(
+                      role="user",
+                      parts=[
+                          _part(
+                              function_response=SimpleNamespace(
+                                  name="get_weather",
+                                  response={"temperature": 12},
+                              )
+                          )
+                      ],
+                  )
+              ],
+          )
+      ]
+  )
+
+  examples = VertexAiExampleStore(_STORE_NAME).get_examples("query")
+
+  function_response = examples[0].output[0].parts[0].function_response
+  assert function_response.name == "get_weather"
+  assert function_response.response == {"temperature": 12}