def validate_resources(self, folder, resources):
        """ validate resources is a wrapper to validate the existence of files
            and that there are no duplicates for a folder and set of resources.

            Parameters
            ==========
            folder: the folder to validate
            resources: one or more resources to validate within the folder
        """
        self.validate_files_exist(folder, resources)
        self.validate_no_duplicate_paths(resources)