How to satisfy unique constraint in django unit test without hardcoding?

Question

I have set a unique constraint on email field of my Member model. Now while writing unit tests, my tests fail due to expiring unique constraint.

def setUp(self):
    self.car_provider = mommy.make(Member, username="car_provider")
    self.car_provider.set_password("12345678")
    self.car_provider.save()

    self.applicant = mommy.make(Member, username="applicant")
    self.applicant.set_password("12345678")
    self.applicant.save()

I get following error: "django.db.utils.IntegrityError: duplicate key value violates unique constraint "account_member_email_a727987b_uniq" DETAIL: Key (email)=() already exists."

If your test is failing due to existing state from a previous run, it's *not* a unit test. — jonrsharpe, Aug 18 '19 at 08:59

score 0 · Answer 1 · answered Aug 18 '19 at 10:16

0

If you set up email as a unique field you actually must have a test for that case and handle that exception somehow.

But to make this test run you should either provide an explicit value for email field in every mommy.make() call. Or you can populate it with randomly generated values with _fill_optional option.

Like:

self.car_provider = mommy.make(Member, username="car_provider", _fill_optional=['email'])

answered Aug 18 '19 at 10:16

Artem Kolontay

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Sorry , just funny, if we have mommy.make() what of daddy.make(),..... Really get me there :() – optimus Apr 28 '22 at 10:10

How to satisfy unique constraint in django unit test without hardcoding?

1 Answers1