Python/Django: how to assert that unit test result contains a certain string?

To assert if a string is or is not a substring of another, you should use assertIn and assertNotIn:

# Passesself.assertIn('bcd', 'abcde')# AssertionError: 'bcd' unexpectedly found in 'abcde'self.assertNotIn('bcd', 'abcde')

These are new since Python 2.7 and Python 3.1

python json django unit-testing assert

self.assertContains(result, "abcd")

You can modify it to work with json.

Use self.assertContains only for HttpResponse objects. For other objects, use self.assertIn.

python json django unit-testing assert

You can write assertion about expected part of string in another string with a simple assertTrue + in python keyword :

self.assertTrue("expected_part_of_string" in my_longer_string)

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