mock env variables pytest

    import os
    import sys
    import pytest
    from unittest import mock
    from click.testing import CliRunner

    def mockenv(**envvars):
        return mock.patch.dict(os.environ, envvars)

    def check_sap_env():
        click.echo("Checking the Linux environment ...")
        if os.environ.get("SPECIAL_ENVVAR") is None:
            click.echo("Linux environment must be set before running this script.")
            sys.exit(1)

    @mockenv(SPECIAL_ENVVAR="/path/to/env")
    def test_get_os_env():
      assert os.getenv("SPECIAL_ENVVAR") is not None