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Plack::Test::AnyEvent(3pm) User Contributed Perl Documentation Plack::Test::AnyEvent(3pm)


Plack::Test::AnyEvent - Run Plack::Test on AnyEvent-based PSGI applications


version 0.08


  use HTTP::Request::Common;
  use Plack::Test;
  $Plack::Test::Impl = 'AnyEvent'; # or 'AE' for short
  test_psgi $app, sub {
    my ( $cb ) = @_;
    my $res = $cb->(GET '/streaming-response');
    is $res->header('Transfer-Encoding'), 'chunked';
    $res->on_content_received(sub {
        my ( $content ) = @_;
        # test chunk of streaming response


This Plack::Test implementation allows you to easily test your AnyEvent-based PSGI applications. Normally, Plack::Test::MockHTTP or Plack::Test::Server work fine for this, but this implementation comes in handy when you'd like to test your streaming results as they come in, or if your application uses long-polling. For non-streaming requests, you can use this module exactly like Plack::Test::MockHTTP; otherwise, you can set up a content handler and call "$res->recv". The event loop will then run until the PSGI application closes its writer handle or until your test client calls "send" on the response.



This function behaves almost identically to "test_psgi" in Plack::Test; the main difference is that the returned response object supports a few additional methods on top of those normally found in an HTTP::Response object:


Calls "recv" on an internal AnyEvent condition variable. Use this after you get the response object to run the event loop.


Calls "send" on an internal AnyEvent condition variable. Use this to stop the event loop when you're done testing.


Sets a callback to be called when a chunk is received from the application. A single argument is passed to the callback; namely, the chunk itself.


As of version 0.02, this module handles uncaught exceptions thrown by your code. If the exception occurs before your PSGI application returns a response, or directly in the response subroutine ref (if you return a subroutine as your application's response), $cb will propagate the exception. Otherwise, the exception is propagated by "$res->recv". Here's an example:

  my $app = sub {
    die 'thrown by $cb';
    return sub {
        my ( $respond ) = @_;
        die 'still thrown by $cb';
        if($streaming) {
            my $writer = $respond->([
                ['Content-Type' => 'text/plain'],
            die 'still thrown by $cb';
            my $timer;
            $timer = AnyEvent->timer(
                after => 2,
                cb    => sub {
                    die 'thrown by $res->recv';
                    undef $timer;
        } else {
                ['Content-Type' => 'text/plain'],
            die 'still thrown by $cb';
  test_psgi $app, sub {
    my ( $cb ) = @_;
    my $res = $cb->(GET '/');
    $res->on_content_received(sub {

Note: The exception handling code may or may not work with your event loop. Please run the tests in this distribution with "PERL_ANYEVENT_MODEL" in AnyEvent set to see if it works with your event loop of choice. Patches will be accepted to accommodate loops, as long as it doesn't break known good ones. The known good event loops are:

This list isn't exclusive; ie. just because your event loop isn't on this list doesn't mean it doesn't work. Also, even if your event loop doesn't pass the exception tests, the general usage of this module (testing requests, handling streaming results and long polling) should work on any AnyEvent loop. Just don't throw any uncaught exceptions =).


AnyEvent, Plack, Plack::Test


Rob Hoelz <>


This software is copyright (c) 2017 by Rob Hoelz.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.


Please report any bugs or feature requests on the bugtracker website <>

When submitting a bug or request, please include a test-file or a patch to an existing test-file that illustrates the bug or desired feature.

2019-02-20 perl v5.28.1