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Riley Schneider
2025-12-03 16:38:10 +01:00
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package Test2::Manual::Tooling::Plugin::TestExit;
our $VERSION = '0.000139';
1;
__END__
=head1 NAME
Test2::Manual::Tooling::Plugin::TestExit - How to safely add pre-exit
behaviors.
=head1 DESCRIPTION
This describes the correct/safe way to add pre-exit behaviors to tests via a
custom plugin.
The naive way to attempt this would be to add an C<END { ... }> block. That can
work, and may not cause problems.... On the other hand there are a lot of ways
that can bite you. Describing all the potential problems of an END block, and
how it might conflict with Test2 (Which has its own END block) is beyond the
scope of this document.
=head1 COMPLETE CODE UP FRONT
package Test2::Plugin::MyPlugin;
use Test2::API qw{test2_add_callback_exit};
sub import {
my $class = shift;
test2_add_callback_exit(sub {
my ($ctx, $orig_code, $new_exit_code_ref) = @_;
return if $orig_code == 42;
$$new_exit_code_ref = 42;
});
}
1;
=head1 LINE BY LINE
=over 4
=item use Test2::API qw{test2_add_callback_exit};
This imports the C<(test2_add_callback_exit)> callback.
=item test2_add_callback_exit(sub { ... });
This adds our callback to be called before exiting.
=item my ($ctx, $orig_code, $new_exit_code_ref) = @_
The callback gets 3 arguments. First is a context object you may use. The
second is the original exit code of the C<END> block Test2 is using. The third
argument is a scalar reference which you may use to get the current exit code,
or set a new one.
=item return if $orig_code == 42
This is a short-cut to do nothing if the original exit code was already 42.
=item $$new_exit_code_ref = 42
This changes the exit code to 42.
=back
=head1 SEE ALSO
L<Test2::Manual> - Primary index of the manual.
=head1 SOURCE
The source code repository for Test2-Manual can be found at
F<https://github.com/Test-More/Test2-Suite/>.
=head1 MAINTAINERS
=over 4
=item Chad Granum E<lt>exodist@cpan.orgE<gt>
=back
=head1 AUTHORS
=over 4
=item Chad Granum E<lt>exodist@cpan.orgE<gt>
=back
=head1 COPYRIGHT
Copyright 2018 Chad Granum E<lt>exodist@cpan.orgE<gt>.
This program is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.
See F<http://dev.perl.org/licenses/>
=cut

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package Test2::Manual::Tooling::Plugin::TestingDone;
our $VERSION = '0.000139';
1;
__END__
=head1 NAME
Test2::Manual::Tooling::Plugin::TestingDone - Run code when the test file is
finished, or when done_testing is called.
=head1 DESCRIPTION
This is a way to add behavior to the end of a test file. This code is run
either when done_testing() is called, or when the test file has no more
run-time code to run.
When triggered by done_testing() this will be run BEFORE the plan is calculated
and sent. This means it IS safe to make test assertions in this callback.
=head1 COMPLETE CODE UP FRONT
package Test2::Plugin::MyPlugin;
use Test2::API qw{test2_add_callback_testing_done};
sub import {
my $class = shift;
test2_add_callback_testing_done(sub {
ok(!$some_global, '$some_global was not set');
print "The test file is done, or done_testing was just called\n"
});
}
1;
=head1 LINE BY LINE
=over 4
=item use Test2::API qw{test2_add_callback_testing_done};
This imports the C<test2_add_callback_testing_done()> callback.
=item test2_add_callback_testing_done(sub { ... });
This adds our callback to be called when testing is done.
=item ok(!$some_global, '$some_global was not set')
It is safe to make assertions in this type of callback. This code simply
asserts that some global was never set over the course of the test.
=item print "The test file is done, or done_testing was just called\n"
This prints a message when the callback is run.
=back
=head1 UNDER THE HOOD
Before test2_add_callback_testing_done() this kind of thing was still possible,
but it was hard to get right, here is the code to do it:
test2_add_callback_post_load(sub {
my $stack = test2_stack();
# Insure we have at least one hub, but we do not necessarily want the
# one this returns.
$stack->top;
# We want the root hub, not the top one.
my ($root) = Test2::API::test2_stack->all;
# Make sure the hub does not believe nothing has happened.
$root->set_active(1);
# Now we can add our follow-up code
$root->follow_up(sub {
# Your callback code here
});
});
=head1 SEE ALSO
L<Test2::Manual> - Primary index of the manual.
=head1 SOURCE
The source code repository for Test2-Manual can be found at
F<https://github.com/Test-More/Test2-Suite/>.
=head1 MAINTAINERS
=over 4
=item Chad Granum E<lt>exodist@cpan.orgE<gt>
=back
=head1 AUTHORS
=over 4
=item Chad Granum E<lt>exodist@cpan.orgE<gt>
=back
=head1 COPYRIGHT
Copyright 2018 Chad Granum E<lt>exodist@cpan.orgE<gt>.
This program is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.
See F<http://dev.perl.org/licenses/>
=cut

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package Test2::Manual::Tooling::Plugin::ToolCompletes;
our $VERSION = '0.000139';
1;
__END__
=head1 NAME
Test2::Manual::Tooling::Plugin::ToolCompletes - How to add behaviors that occur
when a tool completes work.
=head1 DESCRIPTION
This tutorial helps you understand how to add behaviors that occur when a tool
is done with its work. All tools need to acquire and then release a context,
for this tutorial we make use of the release hooks that are called every time a
tool releases the context object.
=head1 COMPLETE CODE UP FRONT
package Test2::Plugin::MyPlugin;
use Test2::API qw{test2_add_callback_context_release};
sub import {
my $class = shift;
test2_add_callback_context_release(sub {
my $ctx_ref = shift;
print "Context was released\n";
});
}
1;
=head1 LINE BY LINE
=over 4
=item use Test2::API qw{test2_add_callback_context_release};
This imports the C<test2_add_callback_context_release()> callback.
=item test2_add_callback_context_release(sub { ... })
=item my $ctx_ref = shift
The coderefs for test2_add_callback_context_release() will receive exactly 1
argument, the context being released.
=item print "Context was released\n"
Print a notification whenever the context is released.
=back
=head1 SEE ALSO
L<Test2::Manual> - Primary index of the manual.
=head1 SOURCE
The source code repository for Test2-Manual can be found at
F<https://github.com/Test-More/Test2-Suite/>.
=head1 MAINTAINERS
=over 4
=item Chad Granum E<lt>exodist@cpan.orgE<gt>
=back
=head1 AUTHORS
=over 4
=item Chad Granum E<lt>exodist@cpan.orgE<gt>
=back
=head1 COPYRIGHT
Copyright 2018 Chad Granum E<lt>exodist@cpan.orgE<gt>.
This program is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.
See F<http://dev.perl.org/licenses/>
=cut

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package Test2::Manual::Tooling::Plugin::ToolStarts;
our $VERSION = '0.000139';
1;
__END__
=head1 NAME
Test2::Manual::Tooling::Plugin::ToolStarts - How to add behaviors that occur
when a tool starts work.
=head1 DESCRIPTION
This tutorial will help you write plugins that have behavior when a tool
starts. All tools should start by acquiring a context object. This tutorial
shows you the hooks you can use to take advantage of the context acquisition.
=head1 COMPLETE CODE UP FRONT
package Test2::Plugin::MyPlugin;
use Test2::API qw{
test2_add_callback_context_init
test2_add_callback_context_acquire
};
sub import {
my $class = shift;
# Let us know every time a tool requests a context, and give us a
# chance to modify the parameters before we find it.
test2_add_callback_context_acquire(sub {
my $params_ref = shift;
print "A tool has requested the context\n";
});
# Callback every time a new context is created, not called if an
# existing context is found.
test2_add_callback_context_init(sub {
my $ctx_ref = shift;
print "A new context was created\n";
});
}
1;
=head1 LINE BY LINE
=over 4
=item use Test2::API qw{test2_add_callback_context_init test2_add_callback_context_acquire};
This imports the C<test2_add_callback_context_init()> and
C<test2_add_callback_context_acquire()> callbacks.
=item test2_add_callback_context_acquire(sub { ... })
This is where we add our callback for context acquisition. Every time
C<Test2::API::context()> is called the callback will be run.
=item my $params_ref = shift
In the test2_add_callback_context_acquire() callbacks we get exactly 1
argument, a reference to the parameters that C<context()> will use to find the
context.
=item print "A tool has requested the context\n"
Print a notification whenever a tool asks for a context.
=item test2_add_callback_context_init(sub { ... })
Add our context init callback. These callbacks are triggered whenever a
completely new context is created. This is not called if an existing context is
found. In short this only fires off for the top level tool, not nested tools.
=item my $ctx_ref = shift
The coderefs for test2_add_callback_context_init() will receive exactly 1
argument, the newly created context.
=item print "A new context was created\n"
Print a notification whenever a new context is created.
=back
=head1 SEE ALSO
L<Test2::Manual> - Primary index of the manual.
=head1 SOURCE
The source code repository for Test2-Manual can be found at
F<https://github.com/Test-More/Test2-Suite/>.
=head1 MAINTAINERS
=over 4
=item Chad Granum E<lt>exodist@cpan.orgE<gt>
=back
=head1 AUTHORS
=over 4
=item Chad Granum E<lt>exodist@cpan.orgE<gt>
=back
=head1 COPYRIGHT
Copyright 2018 Chad Granum E<lt>exodist@cpan.orgE<gt>.
This program is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.
See F<http://dev.perl.org/licenses/>
=cut