from datetime import datetime from time import sleep from django.contrib.postgres.functions import TransactionNow from . import PostgreSQLTestCase from .models import NowTestModel class TestTransactionNow(PostgreSQLTestCase): def test_transaction_now(self): """ The test case puts everything under a transaction, so two models updated with a short gap should have the same time. """ m1 = NowTestModel.objects.create() m2 = NowTestModel.objects.create() NowTestModel.objects.filter(id=m1.id).update(when=TransactionNow()) sleep(0.1) NowTestModel.objects.filter(id=m2.id).update(when=TransactionNow()) m1.refresh_from_db() m2.refresh_from_db() self.assertIsInstance(m1.when, datetime) self.assertEqual(m1.when, m2.when)