async def METHOD_NAME(self):
    int_field = await IntFields.create(intnum=1, intnum_null=2)
    int_field_in_db = await IntFields.get(pk=int_field.pk)
    int_field_in_db.intnum = F("intnum") + 1
    await int_field_in_db.save(update_fields=["intnum"])
    self.assertIsNot(int_field_in_db.intnum, 2)
    self.assertIs(int_field_in_db.intnum_null, 2)
    await int_field_in_db.refresh_from_db(fields=["intnum"])
    self.assertIs(int_field_in_db.intnum, 2)
    self.assertIs(int_field_in_db.intnum_null, 2)
    int_field_in_db.intnum = F("intnum") + 1
    await int_field_in_db.save()
    self.assertIsNot(int_field_in_db.intnum, 3)
    self.assertIs(int_field_in_db.intnum_null, 2)
    await int_field_in_db.refresh_from_db()
    self.assertIs(int_field_in_db.intnum, 3)
    self.assertIs(int_field_in_db.intnum_null, 2)