Beautify test code

test/test_post_hooks.py

@@ -11,14 +11,17 @@ from test.helper import get_params, try_rm
 import youtube_dl.YoutubeDL
 from youtube_dl.utils import DownloadError
 
+
 class YoutubeDL(youtube_dl.YoutubeDL):
     def __init__(self, *args, **kwargs):
         super(YoutubeDL, self).__init__(*args, **kwargs)
         self.to_stderr = self.to_screen
 
+
 TEST_ID = 'gr51aVj-mLg'
 EXPECTED_NAME = 'gr51aVj-mLg'
 
+
 class TestPostHooks(unittest.TestCase):
     def setUp(self):
         self.stored_name_1 = None
@@ -60,5 +63,6 @@ class TestPostHooks(unittest.TestCase):
         for f in self.files:
             try_rm(f)
 
+
 if __name__ == '__main__':
     unittest.main()