How to mock django settings attribute used in another module?

You can also use the following decorator on your individual test functions or test class as a whole. For example:

from django.test import override_settings

@override_settings(BASE_URL='http://localhost')
def test_case()
    ...

Try to use context manager settings() built-in django.

with self.settings(BASE_URL='http://localhost'):
    # perform your test

https://docs.djangoproject.com/en/dev/topics/testing/tools/#django.test.SimpleTestCase.settings

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