refactor: update flaky tests in test_schema.py (#3933)

* Fix flaky tests in `test_schema.py` by using sets for type comparisons

- Updated `post_process_type` function assertions to use sets for more reliable type comparisons.
- Adjusted imports for better code organization.

* Fix import order in test_database.py

* [autofix.ci] apply automated fixes

---------

Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>

src/backend/tests/unit/test_database.py

@@ -2,7 +2,6 @@ import json
 from collections import namedtuple
 from uuid import UUID, uuid4
 
-from langflow.services.database.models.folder.model import FolderCreate
 import orjson
 import pytest
 from fastapi.testclient import TestClient
@@ -13,6 +12,7 @@ from langflow.graph.utils import log_transaction, log_vertex_build
 from langflow.initial_setup.setup import load_flows_from_directory, load_starter_projects
 from langflow.services.database.models.base import orjson_dumps
 from langflow.services.database.models.flow import Flow, FlowCreate, FlowUpdate
+from langflow.services.database.models.folder.model import FolderCreate
 from langflow.services.database.utils import session_getter
 from langflow.services.deps import get_db_service
 

src/backend/tests/unit/test_schema.py

@@ -1,5 +1,5 @@
-from typing import Union
 from collections.abc import Sequence
+from typing import Union
 
 import pytest
 from pydantic import ValidationError
@@ -40,11 +40,11 @@ class TestInput:
         assert input_obj.field_type == "int"
 
     def test_post_process_type_function(self):
-        assert post_process_type(int) == [int]
-        assert post_process_type(list[int]) == [int]
-        assert post_process_type(Union[int, str]) == [int, str]
-        assert post_process_type(Union[int, Sequence[str]]) == [int, str]
-        assert post_process_type(Union[int, Sequence[int]]) == [int]
+        assert set(post_process_type(int)) == {int}
+        assert set(post_process_type(list[int])) == {int}
+        assert set(post_process_type(Union[int, str])) == {int, str}
+        assert set(post_process_type(Union[int, Sequence[str]])) == {int, str}
+        assert set(post_process_type(Union[int, Sequence[int]])) == {int}
 
     def test_input_to_dict(self):
         input_obj = Input(field_type="str")
@@ -110,7 +110,7 @@ class TestPostProcessType:
         assert post_process_type(list[int]) == [int]
 
     def test_union_type(self):
-        assert post_process_type(Union[int, str]) == [int, str]
+        assert set(post_process_type(Union[int, str])) == {int, str}
 
     def test_custom_type(self):
         class CustomType: