[py]: Exit 1 in ci when linter is failing

.github/workflows/ci-python.yml

@@ -38,7 +38,7 @@ jobs:
       - name: Test with tox
         run: tox -c py/tox.ini
         env:
-          TOXENV: linting
+          TOXENV: linting-check
 
   tox_docs:
     if: ${{ needs.check_workflow.outputs.result == 'true' || github.event_name == 'schedule' || github.event_name == 'workflow_dispatch' || contains(toJson(github.event.commits), '[run python]') == true }}

py/tox.ini

@@ -30,6 +30,21 @@ py_version=37
 force_single_line = True
 
 
+[testenv:linting-check]
+; checks linting for CI with stricter exiting when failing.
+skip_install = true
+deps =
+  isort==5.10.1
+  black==22.8.0
+  flake8==5.0.4
+  flake8-typing-imports==1.13.0
+commands =
+  ; execute isort in check only mode.
+  isort --check-only --diff selenium/ test/
+  ; execute black in check only mode with diff.
+  black --check --diff test/ selenium/common/ selenium/webdriver/safari -l 120
+  flake8 selenium/ test/ --min-python-version=3.7
+
 [testenv:linting]
 ; A consolidated linting based recipe, responsible for executing linting tools across the code base.
 ; This encompasses isort for imports, black for general formatting and flake8.