1#!./perl 2 3BEGIN { 4 chdir 't' if -d 't'; 5 @INC = '../lib'; 6} 7 8# this must come before main, or tests will fail 9package TieTest; 10 11use Tie::Scalar; 12use vars qw( @ISA ); 13@ISA = qw( Tie::Scalar ); 14 15sub new { 'Fooled you.' } 16 17package main; 18 19use vars qw( $flag ); 20use Test::More tests => 13; 21 22use_ok( 'Tie::Scalar' ); 23 24# these are "abstract virtual" parent methods 25for my $method qw( TIESCALAR FETCH STORE ) { 26 eval { Tie::Scalar->$method() }; 27 like( $@, qr/doesn't define a $method/, "croaks on inherited $method()" ); 28} 29 30# the default value is undef 31my $scalar = Tie::StdScalar->TIESCALAR(); 32is( $$scalar, undef, 'used TIESCALAR, default value is still undef' ); 33 34# Tie::StdScalar redirects to TIESCALAR 35$scalar = Tie::StdScalar->new(); 36is( $$scalar, undef, 'used new(), default value is still undef' ); 37 38# this approach should work as well 39tie $scalar, 'Tie::StdScalar'; 40is( $$scalar, undef, 'tied a scalar, default value is undef' ); 41 42# first set, then read 43$scalar = 'fetch me'; 44is( $scalar, 'fetch me', 'STORE() and FETCH() verified with one test!' ); 45 46# test DESTROY with an object that signals its destruction 47{ 48 my $scalar = 'foo'; 49 tie $scalar, 'Tie::StdScalar', DestroyAction->new(); 50 ok( $scalar, 'tied once more' ); 51 is( $flag, undef, 'destroy flag not set' ); 52} 53 54# $scalar out of scope, Tie::StdScalar::DESTROY() called, DestroyAction set flag 55is( $flag, 1, 'and DESTROY() works' ); 56 57# we want some noise, and some way to capture it 58use warnings; 59my $warn; 60local $SIG{__WARN__} = sub { 61 $warn = $_[0]; 62}; 63 64# Tie::Scalar::TIEHANDLE should find and call TieTest::new and complain 65is( tie( my $foo, 'TieTest'), 'Fooled you.', 'delegated to new()' ); 66like( $warn, qr/WARNING: calling TieTest->new/, 'caught warning fine' ); 67 68package DestroyAction; 69 70sub new { 71 bless( \(my $self), $_[0] ); 72} 73 74sub DESTROY { 75 $main::flag = 1; 76} 77