chore: Move simulation related modules to a sub-package in evaluation

Co-authored-by: Keyur Joshi <keyurj@google.com>
PiperOrigin-RevId: 838904075

tests/unittests/evaluation/simulation/test_static_user_simulator.py

@@ -0,0 +1,54 @@
+# 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 __future__ import annotations
+
+from google.adk.evaluation.eval_case import Invocation
+from google.adk.evaluation.simulation import static_user_simulator
+from google.adk.evaluation.simulation import user_simulator
+from google.genai import types
+import pytest
+
+
+class TestStaticUserSimulator:
+  """Test cases for StaticUserSimulator."""
+
+  @pytest.mark.asyncio
+  async def test_get_next_user_message(self):
+    """Tests that the provided messages are returned in order followed by the stop signal."""
+    conversation = [
+        Invocation(
+            invocation_id="inv1",
+            user_content=types.Content(parts=[types.Part(text="message 1")]),
+        ),
+        Invocation(
+            invocation_id="inv2",
+            user_content=types.Content(parts=[types.Part(text="message 2")]),
+        ),
+    ]
+    simulator = static_user_simulator.StaticUserSimulator(
+        static_conversation=conversation
+    )
+
+    next_message_1 = await simulator.get_next_user_message(events=[])
+    assert user_simulator.Status.SUCCESS == next_message_1.status
+    assert "message 1" == next_message_1.user_message.parts[0].text
+
+    next_message_2 = await simulator.get_next_user_message(events=[])
+    assert user_simulator.Status.SUCCESS == next_message_2.status
+    assert "message 2" == next_message_2.user_message.parts[0].text
+
+    next_message_3 = await simulator.get_next_user_message(events=[])
+    assert user_simulator.Status.STOP_SIGNAL_DETECTED == next_message_3.status
+    assert next_message_3.user_message is None