$ export PM_1194120_DEBUG=1
$ prove -v pm_1194120.t
pm_1194120.t .. 
1..2
# DEBUG MODE!
# Debug statement #1 (1 == 1): TRUE
# Debug statement #2 (1 == 0): FALSE
ok 1 # skip Debugging
ok 2 # skip Debugging
ok
All tests successful.
Files=1, Tests=2,  ...
Result: PASS
$ prove pm_1194120.t
pm_1194120.t .. # DEBUG MODE!
# Debug statement #1 (1 == 1): TRUE
# Debug statement #2 (1 == 0): FALSE
pm_1194120.t .. ok   
All tests successful.
Files=1, Tests=2,  ...
Result: PASS
$ prove pm_1194120.t > /dev/null
# DEBUG MODE!
# Debug statement #1 (1 == 1): TRUE
# Debug statement #2 (1 == 0): FALSE
$