static boolean isDialectSupported(SqlDialect dialect) {
        return dialect instanceof H2SqlDialect ||
               dialect instanceof MssqlSqlDialect ||
               dialect instanceof MysqlSqlDialect ||
               dialect instanceof OracleSqlDialect ||
               dialect instanceof PostgresqlSqlDialect;
    }
@Test
    public void testUpsertDialectNotSupported() {
        boolean result = SupportedDatabases.isDialectSupported(sybaseSqlDialect);
        assertFalse(result);
    }