如何解决Django 单元测试约束
所以我在为 Check 和 Unique 约束编写单元测试时遇到了问题。以下是他们的定义:
# assert that a partner can have only one headquarter
constraints = [
models.UniqueConstraint(
fields=['partner','active'],condition=models.Q(headquarter=True),name='HQ already set.'
)
]
# assert every partner contant has at least one of email/phone number pair defined
constraints = [
models.CheckConstraint(
check= (
models.Q(email__isnull=False) &
models.Q(phone_number__isnull=False)
),name='E-mail or phone number should be set.'
)
]
并且单元测试断言失败了:
from django.db.utils import IntegrityError
....
# HQ already defined so it should work
with self.assertRaises(Exception) as raised:
partnerHQcopy.save()
self.assertEqual(IntegrityError,type(raised.exception))
.....
# The contact added has both email and phone number None
with self.assertRaises(Exception) as raised:
partnerContact.save()
self.assertEqual(IntegrityError,type(raised.exception))
以及回溯:
======================================================================
ERROR: test_unique_hq_for_partner (partners.tests.PartnerModelsTestCases)
----------------------------------------------------------------------
.....
sqlite3.IntegrityError: UNIQUE constraint Failed: partners_partnerbranch.partner_id,partners_partnerbranch.active
.....
django.db.utils.IntegrityError: UNIQUE constraint Failed: partners_partnerbranch.partner_id,partners_partnerbranch.active
======================================================================
ERROR: test_partner_contact_no_email_no_phone (partners.tests.PartnerModelsTestCases)
----------------------------------------------------------------------
.....
sqlite3.IntegrityError: CHECK constraint Failed: E-mail or phone number should be set.
.....
django.db.utils.IntegrityError: CHECK constraint Failed: E-mail or phone number should be set.
解决方法
这些测试失败的原因是它引发了一个 sqlite3.IntegrityError
,而不是一个 django.db.utils.IntegrityError
,因此您应该断言正确的错误类型:
from sqlite3 import IntegrityError
# …
# HQ already defined so it should work
with self.assertRaises(IntegrityError):
partnerHQCopy.save()
# …
# The contact added has both email and phone number None
with self.assertRaises(IntegrityError):
partnerContact.save()
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