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inside an C<eval BLOCK> with and using C<alarm>.  In these extreme
cases you have no choice but to skip over the broken tests entirely.

The syntax and behavior is similar to a C<SKIP: BLOCK> except the
tests will be marked as failing but todo.  Test::Harness will
interpret them as passing.

=cut

sub todo_skip {
    my($why, $how_many) = @_;

    unless( defined $how_many ) {
        # $how_many can only be avoided when no_plan is in use.
        _carp "todo_skip() needs to know \$how_many tests are in the block"
          unless $Test->has_plan eq 'no_plan';
        $how_many = 1;
    }

    for( 1..$how_many ) {
        $Test->todo_skip($why);
    }

    local $^W = 0;
    last TODO;
}

=item When do I use SKIP vs. TODO?

B<If it's something the user might not be able to do>, use SKIP.
This includes optional modules that aren't installed, running under
an OS that doesn't have some feature (like fork() or symlinks), or maybe
you need an Internet connection and one isn't available.

B<If it's something the programmer hasn't done yet>, use TODO.  This
is for any code you haven't written yet, or bugs you have yet to fix,
but want to put tests in your testing script (always a good idea).


=back

=head2 Complex data structures

Not everything is a simple eq check or regex.  There are times you
need to see if two data structures are equivalent.  For these
instances Test::More provides a handful of useful functions.

B<NOTE> I'm not quite sure what will happen with filehandles.

=over 4

=item B<is_deeply>

  is_deeply( $this, $that, $test_name );

Similar to is(), except that if $this and $that are hash or array
references, it does a deep comparison walking each data structure to
see if they are equivalent.  If the two structures are different, it
will display the place where they start differing.

Test::Differences and Test::Deep provide more in-depth functionality
along these lines.

=back

=cut

our (@Data_Stack, %Refs_Seen);
my $DNE = bless [], 'Does::Not::Exist';
sub is_deeply {
    unless( @_ == 2 or @_ == 3 ) {
        my $msg = <<WARNING;
is_deeply() takes two or three args, you gave %d.
This usually means you passed an array or hash instead
of a reference to it
WARNING
        chop $msg;   # clip off newline so carp() will put in line/file

        _carp sprintf $msg, scalar @_;

	return $Test->ok(0);
    }

    my($this, $that, $name) = @_;

    my $ok;
    if( !ref $this and !ref $that ) {  		# neither is a reference
        $ok = $Test->is_eq($this, $that, $name);
    }
    elsif( !ref $this xor !ref $that ) {  	# one's a reference, one isn't
        $ok = $Test->ok(0, $name);
	$Test->diag( _format_stack({ vals => [ $this, $that ] }) );
    }
    else {			       		# both references
        local @Data_Stack = ();
        if( _deep_check($this, $that) ) {
            $ok = $Test->ok(1, $name);
        }
        else {
            $ok = $Test->ok(0, $name);
            $Test->diag(_format_stack(@Data_Stack));
        }
    }

    return $ok;
}

sub _format_stack {
    my(@Stack) = @_;

    my $var = '$FOO';
    my $did_arrow = 0;
    foreach my $entry (@Stack) {
        my $type = $entry->{type} || '';
        my $idx  = $entry->{'idx'};
        if( $type eq 'HASH' ) {
            $var .= "->" unless $did_arrow++;
            $var .= "{$idx}";
        }
        elsif( $type eq 'ARRAY' ) {
            $var .= "->" unless $did_arrow++;

t/Test/More.pm  view on Meta::CPAN

However, it does mean that functions like is_deeply() cannot be used to
test the internals of string overloaded objects.  In this case I would
suggest Test::Deep which contains more flexible testing functions for
complex data structures.


=item Threads

Test::More will only be aware of threads if "use threads" has been done
I<before> Test::More is loaded.  This is ok:

    use threads;
    use Test::More;

This may cause problems:

    use Test::More
    use threads;


=item Test::Harness upgrade

no_plan and todo depend on new Test::Harness features and fixes.  If
you're going to distribute tests that use no_plan or todo your
end-users will have to upgrade Test::Harness to the latest one on
CPAN.  If you avoid no_plan and TODO tests, the stock Test::Harness
will work fine.

Installing Test::More should also upgrade Test::Harness.

=back


=head1 HISTORY

This is a case of convergent evolution with Joshua Pritikin's Test
module.  I was largely unaware of its existence when I'd first
written my own ok() routines.  This module exists because I can't
figure out how to easily wedge test names into Test's interface (along
with a few other problems).

The goal here is to have a testing utility that's simple to learn,
quick to use and difficult to trip yourself up with while still
providing more flexibility than the existing Test.pm.  As such, the
names of the most common routines are kept tiny, special cases and
magic side-effects are kept to a minimum.  WYSIWYG.


=head1 SEE ALSO

L<Test::Simple> if all this confuses you and you just want to write
some tests.  You can upgrade to Test::More later (it's forward
compatible).

L<Test> is the old testing module.  Its main benefit is that it has
been distributed with Perl since 5.004_05.

L<Test::Harness> for details on how your test results are interpreted
by Perl.

L<Test::Differences> for more ways to test complex data structures.
And it plays well with Test::More.

L<Test::Class> is like XUnit but more perlish.

L<Test::Deep> gives you more powerful complex data structure testing.

L<Test::Unit> is XUnit style testing.

L<Test::Inline> shows the idea of embedded testing.

L<Bundle::Test> installs a whole bunch of useful test modules.


=head1 AUTHORS

Michael G Schwern E<lt>schwern@pobox.comE<gt> with much inspiration
from Joshua Pritikin's Test module and lots of help from Barrie
Slaymaker, Tony Bowden, blackstar.co.uk, chromatic, Fergal Daly and
the perl-qa gang.


=head1 BUGS

See F<http://rt.cpan.org> to report and view bugs.


=head1 COPYRIGHT

Copyright 2001, 2002, 2004 by Michael G Schwern E<lt>schwern@pobox.comE<gt>.

This program is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.

See F<http://www.perl.com/perl/misc/Artistic.html>

=cut

1;