Get a list of paths to suites that are visible on $PATH.

        Returns:
            List of str.

def visible_suite_paths(cls, paths=None):
        """Get a list of paths to suites that are visible on $PATH.

        Returns:
            List of str.
        """
        suite_paths = []
        if paths is None:
            paths = os.getenv("PATH", "").split(os.pathsep)
        for path in paths:
            if path and os.path.isdir(path):
                path_ = os.path.dirname(path)
                filepath = os.path.join(path_, "suite.yaml")
                if os.path.isfile(filepath):
                    suite_paths.append(path_)
        return suite_paths