Fix a path so that test can run on Windows

pytorch_transformers/tests/modeling_common_test.py

@@ -21,6 +21,7 @@ import os
 import shutil
 import json
 import random
+import uuid
 
 import unittest
 import logging
@@ -527,7 +528,7 @@ class ConfigTester(object):
 
     def create_and_test_config_to_json_file(self):
         config_first = self.config_class(**self.inputs_dict)
-        json_file_path = "/tmp/config.json"
+        json_file_path = os.path.join(os.getcwd(), "config_" + str(uuid.uuid4()) + ".json")
         config_first.to_json_file(json_file_path)
         config_second = self.config_class.from_json_file(json_file_path)
         os.remove(json_file_path)