MAINT(validator): cleaned up imports

unittests/test_validation.py

@@ -23,16 +23,12 @@
 """
 test validation
 """
-import importlib
-import os
 from os.path import join
 from pathlib import Path
 
-import caoscrawler
 import jsonschema
 import linkahead as db
 import pytest
-import yaml
 from caoscrawler.validator import (convert_record,
                                    load_json_schema_from_datamodel_yaml,
                                    validate)