diff --git a/storage/api.py b/storage/api.py
index 81ea7fa..fad4248 100644
--- a/storage/api.py
+++ b/storage/api.py
@@ -17,13 +17,14 @@ def upload_file(original=None, name=None, base64=None) -> File:
     return new_file
 
 
-def add_comment(text: str, email: str, files=[]) -> Comment:
+def add_comment(text: str, email: str, files=None) -> Comment:
     """
     :param text: sting
     :param email: string
     :param files: {name?: string, original?: File, base64?: string}[] одно из двух последних свойств должно быть указано
     :return: Comment
     """
+    files = files if files else []
     key = ''.join(random.choice(string.ascii_letters) for _x in range(15))
     comment = Comment.objects.create(
         text=text,
diff --git a/storage/tests.py b/storage/tests.py
index 6b886ea..70a47d3 100644
--- a/storage/tests.py
+++ b/storage/tests.py
@@ -1,3 +1,5 @@
+import tempfile
+
 from django.test import TestCase
 from storage.api import add_comment, delete_comment, update_comment, get_comment
 from django.core.files.uploadedfile import SimpleUploadedFile
@@ -6,10 +8,14 @@ from storage.models import Comment
 
 
 class CommentTestCase(TestCase):
+
     def setUp(self):
         self.first_comment = add_comment("first comment", "vasia@rambler.ru")
         self.second_comment = add_comment(text="Привет, отличная работа", email="artem4000@gmail.com")
 
+    def tearDown(self):
+        Comment.objects.all().delete()
+
     def test_comment_get(self):
         self.assertEqual(self.first_comment, get_comment(self.first_comment.key))
 
@@ -22,12 +28,13 @@ class CommentTestCase(TestCase):
         token = 'fskjfskj'
         comment1 = add_comment(text=token, email="artem4000@gmail.com")
         self.assertEqual(comment1.text, token)
-        file_for_upload = SimpleUploadedFile('1.txt', 'Я файл!'.encode('utf-8'))
-        file_name = 'Клёвый файл'
-        object_for_upload = {'original': file_for_upload, 'name': file_name}
-        comment2 = add_comment(text=token, email="artem4000@gmail.com", files=[object_for_upload])
-        self.assertEqual(comment2.files.count(), 1)
-        self.assertEqual(comment2.files.all()[0].name, file_name)
+        with tempfile.gettempdir() as dir_path:
+            file_for_upload = SimpleUploadedFile(dir_path + '/1.txt', 'Я файл!'.encode('utf-8'))
+            file_name = 'Клёвый файл'
+            object_for_upload = {'original': file_for_upload, 'name': file_name}
+            comment2 = add_comment(text=token, email="artem4000@gmail.com", files=[object_for_upload])
+            self.assertEqual(comment2.files.count(), 1)
+            self.assertEqual(comment2.files.all()[0].name, file_name)
 
     def test_comment_delete(self):
         delete_comment(self.first_comment.key)