diff --git a/tests/controller/test_simbot_controller.py b/tests/controller/test_simbot_controller.py
index d23db6b..bd6d30d 100644
--- a/tests/controller/test_simbot_controller.py
+++ b/tests/controller/test_simbot_controller.py
@@ -1,18 +1,37 @@
 from typing import Any
 
-from pytest_cases import parametrize_with_cases
+from pytest_cases import parametrize, parametrize_with_cases
 
+from emma_experience_hub.api.clients.simbot import SimbotActionPredictionClient
 from emma_experience_hub.api.controllers import SimBotController
 from emma_experience_hub.common.settings import SimBotSettings
 from emma_experience_hub.datamodels.simbot import SimBotRequest
+from tests.fixtures.clients import (
+    mock_policy_response_goto_room,
+    mock_policy_response_search,
+    mock_policy_response_toggle_computer,
+)
 from tests.fixtures.simbot_api_requests import SimBotRequestCases
 
 
-@parametrize_with_cases("request_body", cases=SimBotRequestCases)
+@parametrize_with_cases("request_body", cases=SimBotRequestCases.case_without_previous_actions)
+@parametrize(
+    "mock_policy_responses",
+    [
+        mock_policy_response_toggle_computer,
+        mock_policy_response_goto_room,
+        mock_policy_response_search,
+    ],
+)
 def test_simbot_api(
     request_body: dict[str, Any],
     simbot_settings: SimBotSettings,
+    mock_feature_extraction_response: Any,
+    mock_policy_responses: Any,
 ) -> None:
+    """Test the SimBot API."""
     simbot_request = SimBotRequest.parse_obj(request_body)
     controller = SimBotController.from_simbot_settings(simbot_settings)
-    controller.handle_request_from_simbot_arena(simbot_request)
+    response = controller.handle_request_from_simbot_arena(simbot_request)
+    assert response.actions[0].raw_output is not None
+    assert response.actions[0].raw_output == SimbotActionPredictionClient.generate()  # type: ignore[call-arg]
diff --git a/tests/fixtures/clients.py b/tests/fixtures/clients.py
index 0befa45..1783c57 100644
--- a/tests/fixtures/clients.py
+++ b/tests/fixtures/clients.py
@@ -1,11 +1,19 @@
 from collections.abc import Generator
+from typing import Any
 
 import httpx
 from pydantic import AnyHttpUrl
-from pytest_cases import fixture
+from pytest import MonkeyPatch, fixture
 from pytest_httpx import HTTPXMock
 
 from emma_experience_hub.api.clients import ProfanityFilterClient
+from emma_experience_hub.api.clients.simbot import (
+    SimbotActionPredictionClient,
+    SimBotFeaturesClient,
+    SimBotNLUIntentClient,
+)
+from emma_experience_hub.datamodels import EmmaExtractedFeatures
+from tests.fixtures.simbot_arena_constants import create_placeholder_features_frames
 
 
 @fixture(scope="session")
@@ -19,3 +27,62 @@ def custom_response(request: httpx.Request) -> httpx.Response:  # noqa: WPS430
     yield ProfanityFilterClient(
         endpoint=AnyHttpUrl(url="http://localhost", scheme="http"), timeout=None
     )
+
+
+@fixture
+def mock_feature_extraction_response(monkeypatch: MonkeyPatch) -> None:
+    """Mock get_features from the SimBotFeaturesClient."""
+
+    def mock_features(*args: Any, **kwargs: Any) -> list[EmmaExtractedFeatures]:  # noqa: WPS430
+        features = create_placeholder_features_frames()
+        return features
+
+    monkeypatch.setattr(SimBotFeaturesClient, "get_features", mock_features)
+
+
+@fixture
+def mock_policy_response_goto_room(monkeypatch: MonkeyPatch) -> None:
+    """Mock the responses of EMMA policy."""
+
+    def get_nlu(*args: Any, **kwargs: Any) -> str:  # noqa: WPS430
+        return "<act><one_match>"
+
+    def get_action(*args: Any, **kwargs: Any) -> str:  # noqa: WPS430
+        return "goto breakroom<stop>."
+
+    monkeypatch.setattr(SimBotNLUIntentClient, "generate", get_nlu)
+    monkeypatch.setattr(SimbotActionPredictionClient, "generate", get_action)
+
+
+@fixture
+def mock_policy_response_toggle_computer(monkeypatch: MonkeyPatch) -> None:
+    """Mock the responses of EMMA policy when the input instruction is about turning on the
+    computer."""
+
+    def get_nlu(*args: Any, **kwargs: Any) -> str:  # noqa: WPS430
+        return "<act><one_match>"
+
+    def get_action(*args: Any, **kwargs: Any) -> str:  # noqa: WPS430
+        return "toggle computer <frame_token_1> <vis_token_1><stop>."
+
+    monkeypatch.setattr(SimBotNLUIntentClient, "generate", get_nlu)
+    monkeypatch.setattr(SimbotActionPredictionClient, "generate", get_action)
+
+
+@fixture
+def mock_policy_response_search(monkeypatch: MonkeyPatch) -> None:
+    """Mock the responses of EMMA policy when the input instruction is about searching an
+    object."""
+
+    def get_nlu(*args: Any, **kwargs: Any) -> str:  # noqa: WPS430
+        return "<search>"
+
+    def get_object(*args: Any, **kwargs: Any) -> list[str]:  # noqa: WPS430
+        return ["<frame_token_1> <vis_token_1>"]
+
+    def get_target(*args: Any, **kwargs: Any) -> str:  # noqa: WPS430
+        return "goto object <frame_token_1> <vis_token_1> <stop>."
+
+    monkeypatch.setattr(SimBotNLUIntentClient, "generate", get_nlu)
+    monkeypatch.setattr(SimbotActionPredictionClient, "find_object_in_scene", get_object)
+    monkeypatch.setattr(SimbotActionPredictionClient, "generate", get_target)