fix apply subscription

tests/conftest.py

@@ -0,0 +1,19 @@
+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker
+
+from meal_manager.models import Base
+import pytest
+
+
+@pytest.fixture
+def db_session():
+    engine = create_engine("sqlite:///:memory:")
+    Base.metadata.create_all(bind=engine)  # Create tables
+    TestingSessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+    # Provide a session and the engine
+    db = TestingSessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()