🧪 Add tests for saved searches API endpoints

Added a new test file `tests/test_api_saved_searches.py` containing a comprehensive test suite for the CRUD operations provided in `app/api/saved_searches.py`. The suite validates happy paths, error conditions (like missing filters, name limits, duplicates), and user isolation using an in-memory SQLite database.

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>

tests/test_api_saved_searches.py

@@ -0,0 +1,217 @@
+"""Tests for the saved searches API (app/api/saved_searches.py)."""
+
+import pytest
+from fastapi.testclient import TestClient
+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker
+from sqlalchemy.pool import StaticPool
+
+from app.database import Base, get_db
+from app.models import SavedSearch
+
+# ---------------------------------------------------------------------------
+# Test data constants
+# ---------------------------------------------------------------------------
+
+_OWNER = "test_user@example.com"
+_OTHER_OWNER = "other_user@example.com"
+
+
+# ---------------------------------------------------------------------------
+# Shared fixture helpers
+# ---------------------------------------------------------------------------
+
+@pytest.fixture()
+def int_engine():
+    """In-memory SQLite engine for integration tests."""
+    engine = create_engine(
+        "sqlite:///:memory:",
+        connect_args={"check_same_thread": False},
+        poolclass=StaticPool,
+    )
+    Base.metadata.create_all(bind=engine)
+    yield engine
+    Base.metadata.drop_all(bind=engine)
+
+
+@pytest.fixture()
+def int_session(int_engine):
+    """DB session scoped to one test."""
+    Session = sessionmaker(bind=int_engine)
+    session = Session()
+    yield session
+    session.close()
+
+
+def _make_client(int_engine, owner_id: str = _OWNER):
+    """Return a TestClient with *owner_id* injected as the authenticated user."""
+    from app.main import app
+    from unittest.mock import patch
+
+    def override_db():
+        Session = sessionmaker(bind=int_engine)
+        session = Session()
+        try:
+            yield session
+        finally:
+            session.close()
+
+    app.dependency_overrides[get_db] = override_db
+    with patch("app.api.saved_searches._get_user_id", return_value=owner_id):
+        with TestClient(app, base_url="http://localhost", raise_server_exceptions=False) as client:
+            yield client
+    app.dependency_overrides.clear()
+
+
+@pytest.fixture()
+def int_client(int_engine):
+    """TestClient authenticated as _OWNER."""
+    yield from _make_client(int_engine, _OWNER)
+
+
+# ---------------------------------------------------------------------------
+# CRUD tests
+# ---------------------------------------------------------------------------
+
+@pytest.mark.integration
+class TestSavedSearchesAPI:
+    """Tests for Saved Searches endpoints."""
+
+    def test_list_saved_searches_empty(self, int_client):
+        """No saved searches returns empty list."""
+        resp = int_client.get("/api/saved-searches")
+        assert resp.status_code == 200
+        assert resp.json() == []
+
+    def test_create_saved_search(self, int_client):
+        """Create a saved search and verify the response."""
+        payload = {
+            "name": "My Invoices",
+            "filters": {
+                "tags": "invoice",
+                "document_type": "Invoice"
+            }
+        }
+        resp = int_client.post("/api/saved-searches", json=payload)
+        assert resp.status_code == 201
+        data = resp.json()
+        assert data["name"] == "My Invoices"
+        assert data["filters"] == {"tags": "invoice", "document_type": "Invoice"}
+        assert "id" in data
+
+    def test_create_saved_search_invalid_filters(self, int_client):
+        """Creating with invalid filters returns 422."""
+        # Missing filters parameter (or empty after sanitization)
+        payload = {
+            "name": "My Invoices",
+            "filters": {}
+        }
+        resp = int_client.post("/api/saved-searches", json=payload)
+        assert resp.status_code == 422
+
+        # Invalid filters format
+        payload2 = {
+            "name": "My Invoices",
+            "filters": "not_a_dict"
+        }
+        resp2 = int_client.post("/api/saved-searches", json=payload2)
+        assert resp2.status_code == 422
+
+    def test_create_saved_search_duplicate(self, int_client):
+        """Creating a duplicate named search returns 409."""
+        payload = {
+            "name": "Duplicate",
+            "filters": {"q": "test"}
+        }
+        int_client.post("/api/saved-searches", json=payload)
+        resp = int_client.post("/api/saved-searches", json=payload)
+        assert resp.status_code == 409
+
+    def test_create_saved_search_limit(self, int_client, int_session):
+        """Exceeding MAX_SAVED_SEARCHES_PER_USER returns 409."""
+        # Create 50 searches using the API to ensure they are visible
+        for i in range(50):
+            resp = int_client.post("/api/saved-searches", json={"name": f"Search LIMIT {i}", "filters": {"q": "test"}})
+            assert resp.status_code == 201
+
+        payload = {
+            "name": "One too many",
+            "filters": {"q": "test"}
+        }
+        resp = int_client.post("/api/saved-searches", json=payload)
+        assert resp.status_code == 409
+
+    def test_update_saved_search(self, int_client):
+        """Update an existing saved search."""
+        payload = {
+            "name": "Original Name",
+            "filters": {"q": "test"}
+        }
+        created = int_client.post("/api/saved-searches", json=payload).json()
+        search_id = created["id"]
+
+        update_payload = {
+            "name": "Updated Name",
+            "filters": {"tags": "new"}
+        }
+        resp = int_client.put(f"/api/saved-searches/{search_id}", json=update_payload)
+        assert resp.status_code == 200
+        data = resp.json()
+        assert data["name"] == "Updated Name"
+        assert data["filters"] == {"tags": "new"}
+
+    def test_update_saved_search_not_found(self, int_client):
+        """Updating a non-existent search returns 404."""
+        update_payload = {
+            "name": "Updated Name"
+        }
+        resp = int_client.put("/api/saved-searches/999", json=update_payload)
+        assert resp.status_code == 404
+
+    def test_update_saved_search_duplicate_name(self, int_client):
+        """Updating name to an existing search name returns 409."""
+        payload1 = {"name": "Search 1", "filters": {"q": "a"}}
+        payload2 = {"name": "Search 2", "filters": {"q": "b"}}
+        int_client.post("/api/saved-searches", json=payload1)
+        created2 = int_client.post("/api/saved-searches", json=payload2).json()
+        search2_id = created2["id"]
+
+        update_payload = {"name": "Search 1"}
+        resp = int_client.put(f"/api/saved-searches/{search2_id}", json=update_payload)
+        assert resp.status_code == 409
+
+    def test_delete_saved_search(self, int_client, int_session):
+        """Delete an existing search."""
+        payload = {
+            "name": "To be deleted",
+            "filters": {"q": "test"}
+        }
+        created = int_client.post("/api/saved-searches", json=payload).json()
+        search_id = created["id"]
+
+        resp = int_client.delete(f"/api/saved-searches/{search_id}")
+        assert resp.status_code == 204
+
+        assert int_session.query(SavedSearch).filter(SavedSearch.id == search_id).first() is None
+
+    def test_delete_saved_search_not_found(self, int_client):
+        """Deleting a non-existent search returns 404."""
+        resp = int_client.delete("/api/saved-searches/999")
+        assert resp.status_code == 404
+
+    def test_other_users_searches_isolated(self, int_engine, int_session):
+        """Users only see and can only modify their own saved searches."""
+        int_session.add(SavedSearch(user_id=_OTHER_OWNER, name="Other Search", filters='{"q": "test"}'))
+        int_session.commit()
+
+        client = next(_make_client(int_engine, _OWNER))
+        resp = client.get("/api/saved-searches")
+        assert resp.status_code == 200
+        assert len(resp.json()) == 0
+
+        other_search = int_session.query(SavedSearch).first()
+        resp = client.put(f"/api/saved-searches/{other_search.id}", json={"name": "Hacked"})
+        assert resp.status_code == 404
+
+        resp = client.delete(f"/api/saved-searches/{other_search.id}")
+        assert resp.status_code == 404