Edit File: is_fh.t
#!/usr/bin/perl -w BEGIN { if( $ENV{PERL_CORE} ) { chdir 't'; @INC = ('../lib', 'lib'); } else { unshift @INC, 't/lib'; } } use strict; use Test::More tests => 11; use TieOut; ok( !Test::Builder->is_fh("foo"), 'string is not a filehandle' ); ok( !Test::Builder->is_fh(''), 'empty string' ); ok( !Test::Builder->is_fh(undef), 'undef' ); ok( open(FILE, '>foo') ); END { close FILE; 1 while unlink 'foo' } ok( Test::Builder->is_fh(*FILE) ); ok( Test::Builder->is_fh(\*FILE) ); ok( Test::Builder->is_fh(*FILE{IO}) ); tie *OUT, 'TieOut'; ok( Test::Builder->is_fh(*OUT) ); ok( Test::Builder->is_fh(\*OUT) ); SKIP: { skip "*TIED_HANDLE{IO} doesn't work in this perl", 1 unless defined *OUT{IO}; ok( Test::Builder->is_fh(*OUT{IO}) ); } package Lying::isa; sub isa { my $self = shift; my $parent = shift; return 1 if $parent eq 'IO::Handle'; } ::ok( Test::Builder->is_fh(bless {}, "Lying::isa"));