TESTCASE( fgetpos( fh, &pos1 ) == 0 );
TESTCASE( fwrite( teststring, 1, strlen( teststring ), fh ) == strlen( teststring ) );
TESTCASE( fgetpos( fh, &pos2 ) == 0 );
TESTCASE( fgetpos( fh, &pos1 ) == 0 );
TESTCASE( fwrite( teststring, 1, strlen( teststring ), fh ) == strlen( teststring ) );
TESTCASE( fgetpos( fh, &pos2 ) == 0 );