in reply to Re^4: Testing javascript on Dancer2 psgi sites
in thread Testing javascript on Dancer2 psgi sites

This is the very rough cut of combining plackup (in the form of Plack::Runner) and Twiggy with WWW::Mechanize::Chrome. I intend to flesh this out a bit and package it into its own module, but for the time being it works well enough for me.

Currently, this sets up / patches a Dancer application, but I imagine that converting this to use/support Dancer2 shouldn't be too hard, since all you need to get is $app somewhere, and most likely, Dancer2::Test has just enough code to give you the appropriate $app somewhere.

#!perl -w use strict; use Twiggy::Server; use Dancer::Test; use File::Temp 'tempdir'; use WWW::Mechanize::Chrome; use Log::Log4perl qw(:easy); use Data::Dumper; use Test::More tests => 15; Log::Log4perl->easy_init($ERROR); # Set priority of root logger to ER +ROR #Log::Log4perl->easy_init($TRACE); # Set priority of root logger to E +RROR my $port = 5099; my $server = Twiggy::Server->new( host => '127.0.0.1', port => $port, ); $ENV{DANCER_APPHANDLER} = 'Dancer::Handler::PSGI'; my $handler = Dancer::Handler->get_handler(); Dancer::_load_app('App::mykeep'); my $app = $handler->psgi_app(); $server->register_service($app); # Fudge the config as appropriate for our test Dancer::config()->{mykeep}->{notes_dir} = tempdir( CLEANUP => 1, ); my @cleanup_directories; my $tempdir = tempdir( CLEANUP => 1 ); my $mech; $mech = WWW::Mechanize::Chrome->new( launch_exe => 'C:\\Users\\Corion\\Projekte\\WWW-Mechanize-Chrome\\ +chrome-versions\\chrome-65.0.3301.0\\chrome.exe', data_directory => $tempdir, #headless => 1, ); $mech->clear_js_errors(); my $console = $mech->add_listener('Runtime.consoleAPICalled', sub { diag join ", ", map { $_->{value} // $_->{description} } @{ $_[0]->{params}->{args} }; }); # run your tests here # ...

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Re^6: Testing javascript on Dancer2 psgi sites
by nysus (Parson) on Jan 06, 2018 at 20:01 UTC

    Thanks, Corion. I'll take a close look at this.

    I have one more very basic, big picture question. Why not just just fire up a server with a plackup command directly before running tests and just use that?

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      In my case, I started out with launching my server with plackup, but then I wanted a custom configuration and a fresh database, and I wanted to override how some functions return errors etc., and all of that becomes more cumbersome, together with the uncertainity whether I'm really connecting to the fresh instance and not a left-over instance from a previously interrupted test run.

      But for a very simple start, this is an old version of the end-to-end test run setup I had:

      package helper; use strict; use File::Path; use File::Temp 'tempdir'; use WWW::Mechanize::Chrome; sub spawn_app { my( $port ) = @_; my $h = helper::Child->new; $h->spawn_child( 'plackup', '-a', 'bin/app.pl', '-p', $port ); $h } my @cleanup_directories; END { File::Path::rmtree($_, 0) for @cleanup_directories; } sub spawn_chrome { my $tempdir = tempdir(); push @cleanup_directories, $tempdir; my $mech = WWW::Mechanize::Chrome->new( launch_exe => '...', data_directory => $tempdir, @_ ); } package helper::Child; use strict; sub new { my( $class, %options ) = @_; bless \%options => $class; } sub DESTROY { kill 'KILL', $_[0]->{pid}; wait; } sub spawn_child_win32 { my ( $self, @cmd ) = @_; system(1, @cmd) } sub spawn_child_posix { my ( $self, @cmd ) = @_; require POSIX; POSIX->import("setsid"); # daemonize defined(my $pid = fork()) || die "can't fork: $!"; if( $pid ) { # non-zero now means I am the parent $self->log('debug', "Spawned child as $pid"); return $pid; }; #chdir("/") || die "can't chdir to /: $!"; # We are the child, close about everything, then exec (setsid() != -1) || die "Can't start a new session: $!" +; open(STDERR, ">&STDOUT") || die "can't dup stdout: $!"; open(STDIN, "< /dev/null") || die "can't read /dev/null: $!"; open(STDOUT, "> /dev/null") || die "can't write to /dev/null: $!"; exec @cmd; } sub spawn_child { my ( $self, @cmd ) = @_; my ($pid); if( $^O =~ /mswin/i ) { $pid = $self->spawn_child_win32(@cmd) } else { $pid = $self->spawn_child_posix(@cmd) }; $self->{pid} = $pid; return $pid } 1;

      Used as:

      use lib './t'; use helper; my $port = 5099; my $server = helper::spawn_app( $port ); my $mech = helper::spawn_chrome( ); ...

        I did a little more research on Plack::Test. So it turns out you can use it to start up a server with $Plack::Test::Impl like so:

        use lib 'lib'; BEGIN { $ENV{'DANCER_ENVIRONMENT'} = 'testing' } use Log::Log4perl qw(:easy); use VoteTracker; use Test::More; use Test::HTML::Content; use Plack::Test; use WWW::Mechanize::Chrome; $Plack::Test::Impl = "Server"; Log::Log4perl->easy_init($ERROR); my $app = VoteTracker->to_app; my $test = Plack::Test->create($app); my $port = $test->port; my $mech = WWW::Mechanize::Chrome->new( headless => 1, report_js_error +s => 1, ); $mech->allow( javascript => 1 ); $mech->get("http://localhost:$port/path/to/page"); xpath_ok($mech->content, '//h1[text()="Hello"]', 'Has proper title'); done_testing;

        So this is great. One thing I noticed, however, is that WWW::Mechanize::Chrome is really slow to load. If each test script fires up Chrome, it will take an exceedingly long time to run the tests. Is there a way I can share the Chrome instance across each test?

        Update:I've never used it before but I'm thinking Test::Class might be what the doctor ordered to pull this off, right?

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