NAME

       Plack::Test - Test PSGI applications with various backends

SYNOPSIS

         use Plack::Test;
         use HTTP::Request::Common;

         # Simple OO interface
         my $app = sub { return [ 200, [], [ "Hello "] ] };
         my $test = Plack::Test->create($app);

         my $res = $test->request(GET "/");
         is $res->content, "Hello";

         # traditional - named params
         test_psgi
             app => sub {
                 my $env = shift;
                 return [ 200, [ 'Content-Type' => 'text/plain' ], [ "Hello World" ] ],
             },
             client => sub {
                 my $cb  = shift;
                 my $req = HTTP::Request->new(GET => "http://localhost/hello");
                 my $res = $cb->($req);
                 like $res->content, qr/Hello World/;
             };

         # positional params (app, client)
         my $app = sub { return [ 200, [], [ "Hello "] ] };
         test_psgi $app, sub {
             my $cb  = shift;
             my $res = $cb->(GET "/");
             is $res->content, "Hello";
         };

DESCRIPTION

       Plack::Test is a unified interface to test PSGI applications using HTTP::Request and
       HTTP::Response objects. It also allows you to run PSGI applications in various ways. The
       default backend is "Plack::Test::MockHTTP", but you may also use any Plack::Handler
       implementation to run live HTTP requests against a web server.

METHODS

       create
             $test = Plack::Test->create($app, %options);

           creates an instance of Plack::Test implementation class. $app has to be a valid PSGI
           application code reference.

       request
             $res = $test->request($request);

           takes an HTTP::Request object, runs it through the PSGI application to test and
           returns an HTTP::Response object.

FUNCTIONS

       Plack::Test also provides a functional interface that takes two callbacks, each of which
       represents PSGI application and HTTP client code that tests the application.

       test_psgi
             test_psgi $app, $client;
             test_psgi app => $app, client => $client;

           Runs the client test code $client against a PSGI application $app. The client callback
           gets one argument $cb, a callback that accepts an "HTTP::Request" object and returns
           an "HTTP::Response" object.

           Use HTTP::Request::Common to import shortcuts for creating requests for "GET", "POST",
           "DELETE", and "PUT" operations.

           For your convenience, the "HTTP::Request" given to the callback automatically uses the
           HTTP protocol and the localhost (127.0.0.1 by default), so the following code just
           works:

             use HTTP::Request::Common;
             test_psgi $app, sub {
                 my $cb  = shift;
                 my $res = $cb->(GET "/hello");
             };

           Note that however, it is not a good idea to pass an arbitrary (i.e. user-input) string
           to "GET" or even "HTTP::Request->new" by assuming that it always represents a path,
           because:

             my $req = GET "//foo/bar";

           would represent a request for a URL that has no scheme, has a hostname foo and a path
           /bar, instead of a path //foo/bar which you might actually want.

OPTIONS

       Specify the Plack::Test backend using the environment variable "PLACK_TEST_IMPL" or
       $Plack::Test::Impl package variable.

       The available values for the backend are:

       MockHTTP
           (Default) Creates a PSGI env hash out of HTTP::Request object, runs the PSGI
           application in-process and returns HTTP::Response.

       Server
           Runs one of Plack::Handler backends ("Standalone" by default) and sends live HTTP
           requests to test.

       ExternalServer
           Runs tests against an external server specified in the "PLACK_TEST_EXTERNALSERVER_URI"
           environment variable instead of spawning the application in a server locally.

       For instance, test your application with the "HTTP::Server::ServerSimple" server backend
       with:

         > env PLACK_TEST_IMPL=Server PLACK_SERVER=HTTP::Server::ServerSimple \
           prove -l t/test.t

AUTHOR

       Tatsuhiko Miyagawa