Test2::API::Stack - Object to manage a stack of Test2::Hub instances.

Theinternalsofthispackagearesubjecttochangeatanytime! The public methods provided will not
       change in backwards incompatible ways, but the underlying implementation details might. Donotbreakencapsulationhere!

       Chad Granum <exodist@cpan.org>

       Copyright Chad Granum <exodist@cpan.org>.

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

       See <https://dev.perl.org/licenses/>

perl v5.40.1                                       2025-08-10                             Test2::API::Stack(3pm)

       This module is used to represent and manage a stack of Test2::Hub objects. Hubs are usually in a stack so
       that you can push a new hub into place that can intercept and handle events differently than the primary
       hub.

       Chad Granum <exodist@cpan.org>

       $stack = Test2::API::Stack->new()
           This will create a new empty stack instance. All arguments are ignored.

       $hub = $stack->new_hub()
       $hub = $stack->new_hub(%params)
       $hub = $stack->new_hub(%params, class => $class)
           This  will  generate  a  new  hub  and  push  it  to the top of the stack. Optionally you can provide
           arguments that will be passed into the constructor for the Test2::Hub object.

           If you specify the "'class' => $class" argument, the new hub will be an  instance  of  the  specified
           class.

           Unless your parameters specify 'formatter' or 'ipc' arguments, the formatter and IPC instance will be
           inherited from the current top hub. You can set the parameters to "undef" to avoid having a formatter
           or IPC instance.

           If  there  is  no  top hub, and you do not ask to leave IPC and formatter undef, then a new formatter
           will be created, and the IPC instance from Test2::API will be used.

       $hub = $stack->top()
           This will return the top hub from the stack. If there is no top hub yet this will create it.

       $hub = $stack->peek()
           This will return the top hub from the stack. If there is no top hub yet this will return undef.

       $stack->cull
           This will call "$hub->cull" on all hubs in the stack.

       @hubs = $stack->all
           This will return all the hubs in the stack as a list.

       $stack->clear
           This will completely remove all hubs from the stack. Normally you do not want to do this,  but  there
           are a few valid reasons for it.

       $stack->push($hub)
           This will push the new hub onto the stack.

       $stack->pop($hub)
           This  will  pop  a  hub from the stack, if the hub at the top of the stack does not match the hub you
           expect (passed in as an argument) it will throw an exception.

       Test2::API::Stack - Object to manage a stack of Test2::Hub instances.

       The source code repository for Test2 can be found at <https://github.com/Test-More/test-more/>.

           my $stack = Test2::API::Stack->new;
           my $hub = $stack->top;