chore(api): move tests for draft variable serialization into unit_tests

api/tests/unit_tests/controllers/console/app/workflow_draft_variables_test.py

@@ -5,17 +5,16 @@ from typing import Any, NamedTuple
 
 from flask_restful import marshal
 
-from core.workflow.constants import CONVERSATION_VARIABLE_NODE_ID, SYSTEM_VARIABLE_NODE_ID
+from controllers.console.app.workflow_draft_variable import (
-from factories.variable_factory import build_segment
-from models.workflow import WorkflowDraftVariable
-from services.workflow_draft_variable_service import WorkflowDraftVariableList
-
-from .workflow_draft_variable import (
     _WORKFLOW_DRAFT_VARIABLE_FIELDS,
     _WORKFLOW_DRAFT_VARIABLE_LIST_FIELDS,
     _WORKFLOW_DRAFT_VARIABLE_LIST_WITHOUT_VALUE_FIELDS,
     _WORKFLOW_DRAFT_VARIABLE_WITHOUT_VALUE_FIELDS,
 )
+from core.workflow.constants import CONVERSATION_VARIABLE_NODE_ID, SYSTEM_VARIABLE_NODE_ID
+from factories.variable_factory import build_segment
+from models.workflow import WorkflowDraftVariable
+from services.workflow_draft_variable_service import WorkflowDraftVariableList
 
 _TEST_APP_ID = "test_app_id"
 _TEST_NODE_EXEC_ID = str(uuid.uuid4())