NAME

Test::Stream::Plugin::Grab - Object used to temporarily intercept all events.

EXPERIMENTAL CODE WARNING

This is an experimental release! Test-Stream, and all its components are still in an experimental phase. This dist has been released to cpan in order to allow testers and early adopters the chance to write experimental new tools with it, or to add experimental support for it into old tools.

PLEASE DO NOT COMPLETELY CONVERT OLD TOOLS YET. This experimental release is very likely to see a lot of code churn. API's may break at any time. Test-Stream should NOT be depended on by any toolchain level tools until the experimental phase is over.

DESCRIPTION

Once created this object will intercept and stash all events sent to the shared Test::Stream::Hub object. Once the object is destroyed events will once again be sent to the shared hub.

SYNOPSIS

    use Test::Stream qw/-V1 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");

    # Same as flush, except it destroys the grab object.
    my $events_b = $grab->finish;

After calling finish() the grab object is destroyed and $grab is set to undef. $events_a is an arrayref with the first 2 events. $events_b is an arrayref with the second 2 events.

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');

    # $grab is magically undef after this.
    my $events = $grab->finish;

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

When you call finish() the $grab object will automagically undef itself, but only for the reference used in the method call. If you have other references to the $grab object they will not be undef'd.

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.

METHODS

$grab = $class->new()

Create a new grab object, immediately starts intercepting events.

$ar = $grab->flush()

Get an arrayref of all the events so far, clearing the grab objects internal list.

$ar = $grab->events()

Get an arrayref of all events so far, does not clear the internal list.

$ar = $grab->finish()

Get an arrayref of all the events, then destroy the grab object.

$hub = $grab->hub()

Get the hub that is used by the grab event.

ENDING BEHAVIOR

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

Test::Stream::Plugin::Intercept - Accomplish the same thing, but using blocks instead.

SOURCE

The source code repository for Test::Stream can be found at http://github.com/Test-More/Test-Stream/.

MAINTAINERS

Chad Granum <exodist@cpan.org>

AUTHORS

Chad Granum <exodist@cpan.org>

COPYRIGHT

Copyright 2015 Chad Granum <exodist7@gmail.com>.

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

See http://www.perl.com/perl/misc/Artistic.html

cpanm Test::Stream

perl -MCPAN -e shell
install Test::Stream