How can I unit test django messages?

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I found a really easy approach:

response = self.client.post('/foo/')
messages = list(response.context['messages'])
self.assertEqual(len(messages), 1)
self.assertEqual(str(messages[0]), 'my message')

If you need to check for messages on a response that has no context you can use the following:

from django.contrib.messages import get_messages
messages = list(get_messages(response.wsgi_request))
self.assertEqual(len(messages), 1)
self.assertEqual(str(messages[0]), 'my message')

The fallback storage doesn’t support indexing, however it is an iterable.

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