from django.db.backends.sqlite3._functions import (

    _sqlite_date_trunc,

    _sqlite_datetime_trunc,

    _sqlite_time_trunc,

)

from django.test import SimpleTestCase

class FunctionTests(SimpleTestCase):

    def test_sqlite_date_trunc(self):

        msg = "Unsupported lookup type: 'unknown-lookup'"

        with self.assertRaisesMessage(ValueError, msg):

            _sqlite_date_trunc("unknown-lookup", "2005-08-11", None, None)

    def test_sqlite_datetime_trunc(self):

        msg = "Unsupported lookup type: 'unknown-lookup'"

        with self.assertRaisesMessage(ValueError, msg):

            _sqlite_datetime_trunc("unknown-lookup", "2005-08-11 1:00:00", None, None)

    def test_sqlite_time_trunc(self):

        msg = "Unsupported lookup type: 'unknown-lookup'"

        with self.assertRaisesMessage(ValueError, msg):

            _sqlite_time_trunc("unknown-lookup", "2005-08-11 1:00:00", None, None)