This is the old test implemantation of rtl::XString. If you want to write new or better tests: Identify the test function in the source and remark it. The best way to remark old tests, go to the end of the source code and remark only the test_rtl_<X>String_<function>(hRtlTestResult); so the test will not executed any longer. There are already some new tests for rtl::XString, take a look into the directory sal/qa/rtl/ostring or sal/qa/rtl/oustring, where are some replacements added. Any other Questions? Do not hesitate to contact me at 'lla<at>openoffice.org'. best regards, Lars