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assertIn
does what the name implies: it asserts that argument one is in argument two. But in your test for the detail view, you are passing resp.context['course']
as your argument two, which is not a list or container, it is a single instance.
You need to compare that the two are equal, not that one is in the other.
self.assertEqual(self.course, resp.context['course'])
Source:stackexchange.com