$ perl ../root/harness.pl tests/t13.pl
# Looks like you planned 2 tests but ran 3.
tests/t13.pl ..
Dubious, test returned 255 (wstat 65280, 0xff00)
All 2 subtests passed
Test Summary Report
-------------------
tests/t13.pl (Wstat: 65280 (exited 255) Tests: 3 Failed: 1)
Failed test: 3
Non-zero exit status: 255
Parse errors: Bad plan. You planned 2 tests but ran 3.
Files=1, Tests=3, 0 wallclock secs ( 0.01 usr 0.00 sys + 0.04 cusr 0.01 csys = 0.06 CPU)
Result: FAIL
Failed 1/1 test programs. 1/3 subtests failed.