BEGIN;
	SELECT plan( 3 );

	--
	-- Insertion through sys.write_log()
	--
	CREATE OR REPLACE FUNCTION _test_this( )
		RETURNS BIGINT
	AS $$
		SELECT sys.write_log( 'test' , 'WARNING'::log_level , 'test' );
	$$ LANGUAGE SQL;
	SELECT lives_ok( 'SELECT _test_this()' );
	DROP FUNCTION _test_this( );

	--
	-- Direct insertion must fail
	--
	CREATE FUNCTION _test_this( )
		RETURNS VOID
	AS $$
		INSERT INTO sys.logs( component , level , message )
			VALUES ( 'test' , 'WARNING'::log_level , 'test' );
	$$ LANGUAGE SQL;
	SELECT throws_ok( 'SELECT _test_this()' , 42501 );
	DROP FUNCTION _test_this( );

	--
	-- Updates must fail
	--
	CREATE OR REPLACE FUNCTION _test_this( )
		RETURNS VOID
	AS $$
		UPDATE sys.logs SET component = 'random' WHERE component = 'test';
	$$ LANGUAGE SQL;
	SELECT throws_ok( 'SELECT _test_this()' , 42501 );
	DROP FUNCTION _test_this( );
	
	SELECT * FROM finish( );
ROLLBACK;