How can I find out the absolute path of my source-code? I wrote a test-script that uses the function caller(): 

#! perl -w
# filetest.t
# should be invoked from different directories (prove -r).

use strict;
use warnings;
use Test::More tests => 2;
use File::Basename;
use File::Spec;

my $filename = (eval{caller})[1];
diag("filename of this test-script: $filename");
my $dirname = dirname( $filename );
diag("dirname of this test-script: $dirname");

my $location =
  File::Spec->catfile( $dirname, 'non-existing-file' );
diag("testing a non existing file: $location");
cmp_ok( defined -f $location, '==', 1, 'this test should fail' );

$location =
  File::Spec->catfile( $dirname, 'filetest.t' );
diag("testing an existing file: $location");
cmp_ok( defined -f $location, '==', 1, 'this file should exist' );

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my output of perl lib/t/filetest.t: 

1..2
# filename of this test-script: lib/t/filetest.t
# dirname of this test-script: lib/t
# testing a non existing file: lib/t/non-existing-file
not ok 1 - this test should fail
#   Failed test 'this test should fail'
#   at lib/t/filetest.t line 19.
#          got:
#     expected: 1
# testing an existing file: lib/t/filetest.t
ok 2 - this file should exist
# Looks like you failed 1 test of 2.

[download]
How can I get the absolute filename instead of "./lib/t/filetest.t"?

In reply to absolute pathname by maletin

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