package Test::Simple;

use 5.004;

use strict 'vars';

our ($VERSION);

$VERSION = '0.60';

$VERSION = eval $VERSION;    # make the alpha version come out as a number

use Test::Builder;

my $Test = Test::Builder->new;

sub import {

    my $self = shift;

    my $caller = caller;

    *{$caller.'::ok'} = \&ok;

    $Test->exported_to($caller);

    $Test->plan(@_);

}

=head1 NAME

Test::Simple - Basic utilities for writing tests.

=head1 SYNOPSIS

  use Test::Simple tests => 1;

  ok( $foo eq $bar, 'foo is bar' );

=head1 DESCRIPTION

** If you are unfamiliar with testing B<read Test::Tutorial> first! **

This is an extremely simple, extremely basic module for writing tests

suitable for CPAN modules and other pursuits.  If you wish to do more

complicated testing, use the Test::More module (a drop-in replacement

for this one).

The basic unit of Perl testing is the ok.  For each thing you want to

test your program will print out an "ok" or "not ok" to indicate pass

or fail.  You do this with the ok() function (see below).

The only other constraint is you must pre-declare how many tests you

plan to run.  This is in case something goes horribly wrong during the

test and your test program aborts, or skips a test or whatever.  You

do this like so:

    use Test::Simple tests => 23;

You must have a plan.

=over 4

=item B<ok>

  ok( $foo eq $bar, $name );

  ok( $foo eq $bar );

ok() is given an expression (in this case C<$foo eq $bar>).  If it's

true, the test passed.  If it's false, it didn't.  That's about it.

ok() prints out either "ok" or "not ok" along with a test number (it

keeps track of that for you).

  # This produces "ok 1 - Hell not yet frozen over" (or not ok)

  ok( get_temperature($hell) > 0, 'Hell not yet frozen over' );

If you provide a $name, that will be printed along with the "ok/not

ok" to make it easier to find your test when if fails (just search for

the name).  It also makes it easier for the next guy to understand

what your test is for.  It's highly recommended you use test names.

All tests are run in scalar context.  So this:

    ok( @stuff, 'I have some stuff' );

will do what you mean (fail if stuff is empty)

=cut

sub ok ($;$) {

    $Test->ok(@_);

}

=back

Test::Simple will start by printing number of tests run in the form

"1..M" (so "1..5" means you're going to run 5 tests).  This strange

format lets Test::Harness know how many tests you plan on running in

case something goes horribly wrong.

If all your tests passed, Test::Simple will exit with zero (which is

normal).  If anything failed it will exit with how many failed.  If

you run less (or more) tests than you planned, the missing (or extras)

will be considered failures.  If no tests were ever run Test::Simple

will throw a warning and exit with 255.  If the test died, even after

having successfully completed all its tests, it will still be

considered a failure and will exit with 255.

So the exit codes are...

    0                   all tests successful

    255                 test died

    any other number    how many failed (including missing or extras)

If you fail more than 254 tests, it will be reported as 254.

This module is by no means trying to be a complete testing system.

It's just to get you started.  Once you're off the ground its

recommended you look at L<Test::More>.

=head1 EXAMPLE

Here's an example of a simple .t file for the fictional Film module.

    use Test::Simple tests => 5;

    use Film;  # What you're testing.

    my $btaste = Film->new({ Title    => 'Bad Taste',

                             Director => 'Peter Jackson',

                             Rating   => 'R',

                             NumExplodingSheep => 1

                           });

    ok( defined($btaste) && ref $btaste eq 'Film,     'new() works' );

    ok( $btaste->Title      eq 'Bad Taste',     'Title() get'    );

    ok( $btaste->Director   eq 'Peter Jackson', 'Director() get' );

    ok( $btaste->Rating     eq 'R',             'Rating() get'   );

    ok( $btaste->NumExplodingSheep == 1,        'NumExplodingSheep() get' );

It will produce output like this:

    1..5

    ok 1 - new() works

    ok 2 - Title() get

    ok 3 - Director() get

    not ok 4 - Rating() get

    #    Failed test (t/film.t at line 14)

    ok 5 - NumExplodingSheep() get

    # Looks like you failed 1 tests of 5

Indicating the Film::Rating() method is broken.

=head1 CAVEATS

Test::Simple will only report a maximum of 254 failures in its exit

code.  If this is a problem, you probably have a huge test script.

Split it into multiple files.  (Otherwise blame the Unix folks for

using an unsigned short integer as the exit status).

Because VMS's exit codes are much, much different than the rest of the

universe, and perl does horrible mangling to them that gets in my way,

it works like this on VMS.

    0     SS$_NORMAL        all tests successful

    4     SS$_ABORT         something went wrong

Unfortunately, I can't differentiate any further.

=head1 NOTES

Test::Simple is B<explicitly> tested all the way back to perl 5.004.

Test::Simple is thread-safe in perl 5.8.0 and up.

=head1 HISTORY

This module was conceived while talking with Tony Bowden in his

kitchen one night about the problems I was having writing some really

complicated feature into the new Testing module.  He observed that the

main problem is not dealing with these edge cases but that people hate

to write tests B<at all>.  What was needed was a dead simple module

that took all the hard work out of testing and was really, really easy

to learn.  Paul Johnson simultaneously had this idea (unfortunately,

he wasn't in Tony's kitchen).  This is it.

=head1 SEE ALSO

=over 4

=item L<Test::More>

More testing functions!  Once you outgrow Test::Simple, look at

Test::More.  Test::Simple is 100% forward compatible with Test::More

(i.e. you can just use Test::More instead of Test::Simple in your

programs and things will still work).

=item L<Test>

The original Perl testing module.

=item L<Test::Unit>

Elaborate unit testing.

=item L<Test::Inline>, L<SelfTest>

Embed tests in your code!

=item L<Test::Harness>

Interprets the output of your test program.

=back

=head1 AUTHORS

Idea by Tony Bowden and Paul Johnson, code by Michael G Schwern

E<lt>schwern@pobox.comE<gt>, wardrobe by Calvin Klein.

=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

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