Вот эта проверка
SimpleTestCase.assertInHTML(self, "<td>Hello</td>", response.content)
валится с ошибкой
File "/home/***/***/***/lib/python3.4/site-packages/django/test/testcases.py", line 674, in assertInHTML
'Second argument is not valid HTML:')
File "/home/***/***/***/lib/python3.4/site-packages/django/test/testcases.py", line 67, in assert_and_parse_html
dom = parse_html(html)
File "/home/***/***/***/lib/python3.4/site-packages/django/test/html.py", line 229, in parse_html
parser.feed(html)
File "/usr/lib/python3.4/html/parser.py", line 164, in feed
self.rawdata = self.rawdata + data
TypeError: Can't convert 'bytes' object to str implicitly
Подскажите, пожалуйста, что не так со вторым аргументом?