Fix pep8 violations in some tests

lms/djangoapps/courseware/management/commands/tests/test_dump_course.py

@@ -35,6 +35,7 @@ TEST_DATA_MIXED_XML_MODULESTORE = mixed_store_config(
     DATA_DIR, MAPPINGS, include_xml=True, xml_course_dirs=XML_COURSE_DIRS
 )
 
+
 class CommandsTestBase(TestCase):
     """
     Base class for testing different django commands.

lms/djangoapps/django_comment_client/forum/tests.py

@@ -29,6 +29,7 @@ log = logging.getLogger(__name__)
 
 # pylint: disable=missing-docstring
 
+
 @override_settings(MODULESTORE=TEST_DATA_MOCK_MODULESTORE)
 class ViewsExceptionTestCase(UrlResetMixin, ModuleStoreTestCase):
 

lms/djangoapps/verify_student/tests/test_ssencrypt.py

@@ -6,6 +6,7 @@ from verify_student.ssencrypt import (
     rsa_decrypt, rsa_encrypt, random_aes_key
 )
 
+
 def test_aes():
     key_str = "32fe72aaf2abb44de9e161131b5435c8d37cbdb6f5df242ae860b283115f2dae"
     key = key_str.decode("hex")
@@ -27,6 +28,7 @@ def test_aes():
     assert_roundtrip("")
     assert_roundtrip("\xe9\xe1a\x13\x1bT5\xc8")  # Random, non-ASCII text
 
+
 def test_rsa():
     # Make up some garbage keys for testing purposes.
     pub_key_str = """-----BEGIN PUBLIC KEY-----