def _is_ci_fork_pull_request():
if os.getenv('<STR_LIT>'):<EOL><INDENT>if os.getenv('<STR_LIT>'):<EOL><INDENT>return True<EOL><DEDENT><DEDENT>elif os.getenv('<STR_LIT>'):<EOL><INDENT>if os.getenv('<STR_LIT>'):<EOL><INDENT>return True<EOL><DEDENT><DEDENT>return False<EOL>
Check if the tests are being run in a CI environment from a PR.

    Check if the tests are being run in a CI environment and if it is a pull
    request.

    Returns:
        bool: True if the tests are executed inside a CI tool, and the changes
            are not against the "master" branch.