# ./p.pl
4 - 2 = 2
ok 1 - maths works

-2.3 - -0.6 = -1.7
not ok 2 - maths works
#   Failed test 'maths works'
#   at ./p.pl line 13.
#          got: -1.7
#     expected: -1.7
1..2
# Looks like you failed 1 test of 2.