Fix test

Author: alukach

tests/api/test_api.py

@@ -272,7 +272,8 @@ async def test_app_query_extension_gte(load_test_data, app_client, load_test_col
 
 
 async def test_app_collection_fields_extension(load_test_data, app_client, load_test_collection):
-    resp = await app_client.get(f"/collections", params={"fields": ["id", "title"]})
+    fields = ["id", "title"]
+    resp = await app_client.get(f"/collections", params={"fields": fields})
     assert resp.status_code == 201
     resp_json = resp.json()
     resp_collections = resp_json['collections']