✅(backend) tests feature flags

I add a separate test file for feature flags
so the feature flags do not interact with
the testings of other feature

Signed-off-by: charles <charles.englebert@protonmail.com>

src/backend/core/tests/documents/test_api_documents_search_feature_flag.py

@@ -0,0 +1,89 @@
+"""
+Tests for Find search feature flags
+"""
+
+from unittest import mock
+
+from django.http import HttpResponse
+
+import pytest
+import responses
+from rest_framework.test import APIClient
+from waffle.testutils import override_flag
+
+from core.enums import FeatureFlag, SearchType
+from core.services.search_indexers import get_document_indexer
+
+pytestmark = pytest.mark.django_db
+
+
+@responses.activate
+@mock.patch("core.api.viewsets.DocumentViewSet._title_search")
+@mock.patch("core.api.viewsets.DocumentViewSet._search_with_indexer")
+@pytest.mark.parametrize(
+    "activated_flags,"
+    "expected_search_type,"
+    "expected_search_with_indexer_called,"
+    "expected_title_search_called",
+    [
+        ([], SearchType.TITLE, False, True),
+        ([FeatureFlag.FLAG_FIND_HYBRID_SEARCH], SearchType.HYBRID, True, False),
+        (
+            [
+                FeatureFlag.FLAG_FIND_HYBRID_SEARCH,
+                FeatureFlag.FLAG_FIND_FULL_TEXT_SEARCH,
+            ],
+            SearchType.HYBRID,
+            True,
+            False,
+        ),
+        ([FeatureFlag.FLAG_FIND_FULL_TEXT_SEARCH], SearchType.FULL_TEXT, True, False),
+    ],
+)
+# pylint: disable=too-many-arguments, too-many-positional-arguments
+def test_api_documents_search_success(  # noqa : PLR0913
+    mock_search_with_indexer,
+    mock_title_search,
+    activated_flags,
+    expected_search_type,
+    expected_search_with_indexer_called,
+    expected_title_search_called,
+):
+    """
+    Test that the API endpoint for searching documents returns a successful response
+    with the expected search type according to the activated feature flags,
+    and that the appropriate search method is called.
+    """
+    assert get_document_indexer() is not None
+
+    mock_search_with_indexer.return_value = HttpResponse()
+    mock_title_search.return_value = HttpResponse()
+
+    with override_flag(
+        FeatureFlag.FLAG_FIND_HYBRID_SEARCH,
+        active=FeatureFlag.FLAG_FIND_HYBRID_SEARCH in activated_flags,
+    ):
+        with override_flag(
+            FeatureFlag.FLAG_FIND_FULL_TEXT_SEARCH,
+            active=FeatureFlag.FLAG_FIND_FULL_TEXT_SEARCH in activated_flags,
+        ):
+            response = APIClient().get(
+                "/api/v1.0/documents/search/", data={"q": "alpha"}
+            )
+
+    assert response.status_code == 200
+
+    if expected_search_with_indexer_called:
+        mock_search_with_indexer.assert_called_once()
+        assert (
+            mock_search_with_indexer.call_args.kwargs["search_type"]
+            == expected_search_type
+        )
+    else:
+        assert not mock_search_with_indexer.called
+
+    if expected_title_search_called:
+        assert SearchType.TITLE == expected_search_type
+        mock_title_search.assert_called_once()
+    else:
+        assert not mock_title_search.called