Harness on too few tests

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$ perl ../root/harness.pl tests/t12.pl

tests/t12.......# Looks like you planned 3 tests but only ran 2.
 Dubious, test returned 255 (wstat 65280, 0xff00)
 Failed 1/3 subtests

Test Summary Report
-------------------
tests/t12.pl (Wstat: 65280 Tests: 2 Failed: 0)
  Non-zero exit status: 255
  Parse errors: Bad plan.  You planned 3 tests but ran 2.
Files=1, Tests=2,  0 wallclock secs
   ( 0.01 usr  0.00 sys +  0.02 cusr  0.00 csys =  0.03 CPU)
Result: FAIL
Failed 1/1 test programs. 0/2 subtests failed.