Perl: Device::USB doesn't pass the tests

Question

How could I find out the reason for the failing?

make test:

PERL_DL_NONLAZY=1 /usr/local/bin/perl "-MExtUtils::Command::MM" "-e" "test_harness(0, 'blib/lib', 'blib/arch')" t/*.tt/00-load.t ....................... 1/1 # Testing Device::USB 0.35, Perl 5.014000, /usr/local/bin/perl t/00-load.t ....................... ok
t/01-create-usb.t ................. Failed 2/2 subtests
...
...

Test Summary Report

t/01-create-usb.t (Wstat: 11 Tests: 0 Failed: 0)
Non-zero wait status: 11
Parse errors: Bad plan. You planned 2 tests but ran 0.
...
...

Result: FAIL Failed 16/22 test programs. 0/38 subtests failed. make: * [test_dynamic] Fehler 255

When I ran this script I get a Segmentation fault message (Speicherzugriffsfehler):

#!/usr/local/bin/perl
use warnings;
use strict;
use Device::USB;

my $usb = Device::USB->new();

Answer 1

1. perl -d:Trace ... to find the failure point within the Perl code.
2. A tool like strace to find the failure point at the system call level.

Answer 2

Which version of libusb do you have? There seems to be a ticket open on the module that decribes a problem similar to yours: https://rt.cpan.org/Public/Bug/Display.html?id=65908

RT tickets open on a module are linked from the main search.cpan.org page for the module, here http://search.cpan.org/dist/Device-USB/ It is often worth having a look at the queue if you're having problems with the module.