Test Automatici^2 per applicazioni Web

Test automatici2 per applicazioni Web Stefano Rodighiero - larsen@perl.it

Scrivere software = Gestire la complessità

Complessità You might think of this as mental juggling - the more mental balls the program requires you to keep in the air at once, the more likely you’ll drop one of the balls, leading to a design or coding error. -- Steve McConnell

Gestire la complessità • Loose coupling • Tecniche standard • KISS • Test?

Test? «Testing by itself does not improve software quality. [...] Trying to improve software by increasing the amount of testing is like trying to lose weight by weighting yourself more often» -- Steve McConnell

Test! • Aumenta indirettamente la qualità del software • Design for testing • Refactoring • Wishful thinking • Conﬁdenza con il proprio codice

Esempio #!/usr/bin/perl -w use Test::Simple tests => 2; use Date::ICal; my $ical = Date::ICal->new; # make an object ok( defined $ical ); # check we got something ok( $ical->isa('Date::ICal') ); # and it's the right class

Gradualmente • prova.pl → t/01_base.t • diag() • Usare gli occhi • map <F8> :! prove %<C-M> • YMMV :)

Applicazioni web

Paradigma MVC Presentazione Model Controllo

Test di videogame • Situazioni difﬁcili da riprodurre • Grande complessità • Chi effettua il test non è il programmatore

Test di applicazioni web • Workﬂow complessi • Quello che non è automatico tende a non essere fatto

WWW::Mechanize #!/usr/bin/perl use strict; use warnings; use WWW::Mechanize; my $agent = WWW::Mechanize->new(); $agent->get( 'http://www.google.com' ); print $agent->content();

Test::WWW::Mechanize #!/usr/bin/perl use strict; use warnings; use Test::More qw/ no_plan /; use Test::WWW::Mechanize; my $agent = Test::WWW::Mechanize->new(); $agent->get_ok( 'http://www.google.com' ); $agent->title_is( 'Google' );

WWW::Mechanize::Shell calvin:~ larsen$ perl -MWWW::Mechanize::Shell -e shell >g http://www.google.com Retrieving http://www.google.com(200) http://www.google.com>script mech3.pl http://www.google.com>quit calvin:~ larsen$

WWW::Mechanize::Shell #!perl -w use strict; use WWW::Mechanize; use WWW::Mechanize::FormFiller; use URI::URL; my $agent = WWW::Mechanize->new( autocheck => 1 ); my $formfiller = WWW::Mechanize::FormFiller->new(); $agent->env_proxy(); $agent->get('http://www.google.com'); $agent->form(1) if $agent->forms and scalar @{$agent->forms}; mech3.pl

HTTP::Recorder

proxy.pl #!/usr/bin/perl use strict; use warnings; use HTTP::Proxy qw/ :log /; use HTTP::Recorder; my $proxy = HTTP::Proxy->new; my $agent = HTTP::Recorder->new( file => quot;/tmp/tmpfilequot; , showwindow => 1 ); $proxy->logmask( STATUS | PROCESS | HEADERS ); $proxy->port( 3128 ); $proxy->host( '' ); $proxy->agent( $agent ); $proxy->start();

Idee • Usare proxy.pl con un sistema di bugtracking (il ticket contiene il codice per riprodurre l’errore) • Testare applicazioni non scritte in Perl • Screenscraping

Conclusioni • Integrate le pratiche di testing nel vostro workﬂow lavorativo • Gradualmente! • Sono pratiche che pagano da subito • Come posso progettare il codice per facilitarne il test?

Monday, I could wait till Tuesday If I make up my mind Wednesday would be ﬁne, Thursday’s on my mind Friday’d give me time, Saturday could wait But Sunday’d be too late -- Sting

Grazie :) larsen@perl.it http://larsen.perlmonk.org/blog

Riferimenti • Web Testing with HTTP::Recorder http://www.perl.com/pub/a/2004/06/04/recorder.html • Test di applicazioni web http://www.perl.it/blog/archives/000036.html • A Perl Testing Tutorial (PDF) http://www.wgz.org/chromatic/perl/IntroTestMore.pdf • Migliorare la navigazione sul web con Perl http://www.perl.it/blog/archives/000076.html • Documentazione dei vari moduli menzionati http://search.cpan.org/

Test Automatici^2 per applicazioni Web

by Stefano Rodighiero

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