from documents.tests.utils import DirectoriesMixin, TestMigrations class TestMigrateNullCharacters(DirectoriesMixin, TestMigrations): migrate_from = '1014_auto_20210228_1614' migrate_to = '1015_remove_null_characters' def setUpBeforeMigration(self, apps): Document = apps.get_model("documents", "Document") self.doc = Document.objects.create(content="aaa\0bbb") def testMimeTypesMigrated(self): Document = self.apps.get_model('documents', 'Document') self.assertNotIn("\0", Document.objects.get(id=self.doc.id).content)