Add flake8 test

Signed-off-by: yongjunhong <[email protected]>

Author: YongGoose

tests/pytest/conftest.py

@@ -2,7 +2,6 @@
 # -*- coding: utf-8 -*-
 # Copyright (c) 2021 LG Electronics Inc.
 # SPDX-License-Identifier: Apache-2.0
-
 import pytest
 import subprocess
 

tox.ini

@@ -49,3 +49,4 @@ commands =
   # Test for making excutable file
   pyinstaller --onefile cli.py -n cli --additional-hooks-dir=hooks --add-binary=src\fosslight_dependency\third_party\askalono\askalono.exe:third_party\askalono --add-binary=LICENSE:LICENSES --add-binary=LICENSES\LicenseRef-3rd_party_licenses.txt:LICENSES --collect-datas fosslight_util --hidden-import=_cffi_backend
   pytest -m "windows"
+  pytest -v --flake8