Test2::Tools::Grab(3perl)                     Perl Programmers Reference Guide


NAME
       Test2::Tools::Grab - Temporarily intercept all events without adding a
       scope level.

DESCRIPTION
       This package provides a function that returns an object that grabs all
       events.  Once the object is destroyed events will once again be sent to
       the main hub.

SYNOPSIS
           use Test2::Tools::Grab;

           my $grab = grab();

           # Generate some events, they are intercepted.
           ok(1, "pass");
           ok(0, "fail");

           my $events_a = $grab->flush;

           # Generate some more events, they are intercepted.
           ok(1, "pass");
           ok(0, "fail");

           my $events_b = $grab->finish;

EXPORTS
       $grab = grab()
           This lets you intercept all events for a section of code without
           adding anything to your call stack. This is useful for things that
           are sensitive to changes in the stack depth.

               my $grab = grab();
                   ok(1, 'foo');
                   ok(0, 'bar');

               my $events = $grab->finish;

               is(@$events, 2, "grabbed 2 events.");

           If the $grab object is destroyed without calling finish(), it will
           automatically clean up after itself and restore the parent hub.

               {
                   my $grab = grab();
                   # Things are grabbed
               }
               # Things are back to normal

           By default the hub used has "no_ending" set to true. This will
           prevent the hub from enforcing that you issued a plan and ran at
           least 1 test. You can turn enforcement back one like this:

               $grab->hub->set_no_ending(0);

           With "no_ending" turned off, "finish" will run the post-test checks
           to enforce the plan and that tests were run. In many cases this
           will result in additional events in your events array.

SEE ALSO
       Test2::Util::Grabber - The object constructed and returned by this
       tool.

SOURCE
       The source code repository for Test2 can be found at
       https://github.com/Test-More/Test2-Suite/.

MAINTAINERS
       Chad Granum <exodist@cpan.org>

AUTHORS
       Chad Granum <exodist@cpan.org>

COPYRIGHT
       Copyright 2018 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 http://dev.perl.org/licenses/

perl v5.40.0                      2024-09-01         Test2::Tools::Grab(3perl)