refactor: conditional installation of mock (#53) (#54)

* refactor: conditional installation of mock (#53)

* (chore): add markers for mock package in pyproject.toml
* (refactor): try to import mock from unittest first
* (refactor): update imports order according to pep08
  see: https://peps.python.org/pep-0008/#imports

* refactor: conditional installation of mock (#53)

* (fix): failing tests for python3 < 3.8 caused by mock doesn't define
  '__iter__()' method for 'mock_open()'

Author: nautics889

pyproject.toml

@@ -27,7 +27,7 @@ pytest = [
 ]
 flake8 = "^3.9.2"
 pytest-coverage = "*"
-mock = "*"
+mock = { version = "*", markers = "python_version < '3.8'" }
 more-itertools = "*"
 
 [build-system]

tests/test_kernelcare.py

@@ -1,13 +1,18 @@
-import pytest
-import mock
-
-import uchecker
+import sys
 
 try:
     from cStringIO import StringIO
 except ImportError:
     from io import StringIO
 
+import pytest
+if sys.version_info < (3, 8):
+    import mock
+else:
+    from unittest import mock
+
+import uchecker
+
 
 LIBCARE_INFO_OUT = '{"pid": 20025, "comm": "sshd" , '\
     '"libc-2.17.so": {"buildid": "f9fafde281e0e0e2af45911ad0fa115b64c2cea8", "patchlvl": 2021021205}, '\