toLocal8Bit() test seems faulty to me

I checked the "toLocal8Bit()" test in tests/auto/corelib/codecs/qtextcodec. It starts a process, writes two bytes to the process and then asserts that the process exits normally with exit code 0. It never reads anything from anywhere.

The process it starts is defined in test/auto/corelib/codecs/qtextcodec/echo for all I can tell. That process prints a string to stdout and then quits with exit code 0. It never reads anything from anywhere as far as I can tell.

I fail to see how this test actually tests anything related to QTextCodec.