CODEWITHSUNDEEP
pythondjango
Saša Kalaba
Saša Kalaba

Reputation: 4411

How to access error message from ValidationError?

In my test.py I have:

with self.assertRaises(ValidationError):
    validate_zipfile(test_zip_path + '.zip')

And this works as intended. I also want to access the error message this ValidationError raises, so I can do this:

self.assertEqual(#error that I extract from the code above, 'Zip file not in correct format.')

Upvotes: 0

Views: 1617

Answers (1)

Martijn Pieters
Martijn Pieters

Reputation: 1122142

Store the assertRaises() context manager, it has an exception attribute for you to introspect the exception raised:

with self.assertRaises(ValidationError) as exception_cm:
    validate_zipfile(test_zip_path + '.zip')

exception = exception_cm.exception
self.assertIn('Zip file not in correct format.', exception.messages)

You could use the Django-specific assertRaisesMessage() method, but take into account that that test does a simple substring test (e.g. you could potentially run into a false positive where you test for a substring of a longer message). Since ValidationError handles a list of messages, a test against ValidationError.messages is going to be more robust.

Upvotes: 6

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