* flake8 fixes -- tests only
* fix ci failure
* integrate fix from is_3551 so tests will pass.
* Update tests/test_builtins.py
Co-authored-by: Gil Forsyth <gforsyth@users.noreply.github.com>
* Setting -l flag loads environment on non-interactive shell
* Added checking dash existance in sys.argv[0]
* Fixed -a switch behaviour
* Added tests for xexec
* Added test for python<3.7 on Windows
* Testing non existent command with mocked execvpe