Method test_cache_key_no_method

test/sql/test_compare.py:1439–1463

(self)

        eq_(f1._generate_cache_key(), None)

    def test_cache_key_no_method(self):
        class Foobar1(ClauseElement):
            pass

        class Foobar2(ColumnElement):
            pass

        # the None for cache key will prevent objects
        # which contain these elements from being cached.
        f1 = Foobar1()
        with expect_warnings(
            "Class Foobar1 will not make use of SQL compilation caching"
        ):
            eq_(f1._generate_cache_key(), None)

        f2 = Foobar2()
        with expect_warnings(
            "Class Foobar2 will not make use of SQL compilation caching"
        ):
            eq_(f2._generate_cache_key(), None)

        s1 = select(column("q"), Foobar2())

        # warning is memoized, won't happen the second time
        eq_(s1._generate_cache_key(), None)

    def test_get_children_no_method(self):
        class Foobar1(ClauseElement):