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poe-gen-tests

NAME

poe-gen-tests - generate standard POE tests for third-party modules

SYNOPSIS

   poe-gen-tests --dirbase t/loops \
     --loop Glib \
     --loop Kqueue \
     --loop Event::Lib \
     --loop POE::XS::Loop::Poll
 
 

DESCRIPTION

This program and the accompanying POE::Test::Loop::* modules make up POE's tests for POE::Loop subclasses. These tests are designed to run identically regardless of the current event loop. POE uses them to test the event loops it bundles:

   POE::Loop::Gtk
   POE::Loop::IO_Poll (--loop IO::Poll)
   POE::Loop::Tk
   POE::Loop::Event
   POE::Loop::Select
 
 

Developers of other POE::Loop modules are encouraged use this package to generate over 420 comprehensive tests for their own work.

USAGE

poe-gen-tests creates test files for one or more event loops beneath the directory specified in --dirbase. For example,

   poe-gen-tests --dirbase t/loops --loop Select
 
 

generates the following test files:

   t/loops/select/all_errors.t
   t/loops/select/comp_tcp.t
   t/loops/select/comp_tcp_concurrent.t
   t/loops/select/connect_errors.t
   t/loops/select/k_alarms.t
   t/loops/select/k_aliases.t
   t/loops/select/k_detach.t
   t/loops/select/k_selects.t
   t/loops/select/k_sig_child.t
   t/loops/select/k_signals.t
   t/loops/select/k_signals_rerun.t
   t/loops/select/sbk_signal_init.t
   t/loops/select/ses_nfa.t
   t/loops/select/ses_session.t
   t/loops/select/wheel_accept.t
   t/loops/select/wheel_curses.t
   t/loops/select/wheel_readline.t
   t/loops/select/wheel_readwrite.t
   t/loops/select/wheel_run.t
   t/loops/select/wheel_sf_ipv6.t
   t/loops/select/wheel_sf_tcp.t
   t/loops/select/wheel_sf_udp.t
   t/loops/select/wheel_sf_unix.t
   t/loops/select/wheel_tail.t
 
 

The --loop parameter is either a POE::Loop::... class name or the event loop class that will complete the POE::Loop::... package name.

   poe-gen-tests --dirbase t/loops --loop Event::Lib
   poe-gen-tests --dirbase t/loops --loop POE::Loop::Event_Lib
 
 

poe-gen-tests looks for a ``=for poe_tests'' section within the POE::Loop class being tested. If defined, this section should include a single function, skip_tests(), that determines whether any given test should be skipped.

skip_tests() is called with one parameter, the base name of the test about to be executed. It returns false if the test should run, or a message that will be displayed to the user explaining why the test will be skipped. This message is passed directly to Test::More's plan() along with ``skip_all''. The logic is essentially:

   if (my $why = skip_tests("k_signals_rerun")) {
     plan skip_all => $why;
   }
 
 

skip_tests() should load any modules required by the event loop. See most of the examples below.

Example poe_tests Directives

From POE::Loop::Event

   =for poe_tests
 
   sub skip_tests {
     my $test_name = shift;
     if ($test_name eq "k_signals_rerun" and $^O eq "MSWin32") {
       return "This test crashes Perl when run with Event on $^O";
     }
     return "Event tests require the Event module" if (
       do { eval "use Event"; $@ }
     );
   }
 
   =cut
 
 

From POE::Loop::Gtk

   =for poe_tests
 
   sub skip_tests {
     return "Gtk needs a DISPLAY (set one today, okay?)" unless (
       defined $ENV{DISPLAY} and length $ENV{DISPLAY}
     );
     return "Gtk tests require the Gtk module" if do { eval "use Gtk"; $@ };
     return;
   }
 
   =cut
 
 

From POE::Loop::IO_Poll

   =for poe_tests
 
   sub skip_tests {
     return "IO::Poll is not 100% compatible with $^O" if $^O eq "MSWin32";
     return "IO::Poll tests require the IO::Poll module" if (
       do { eval "use IO::Poll"; $@ }
     );
   }
 
   =cut
 
 

From POE::Loop::Select

   =for poe_tests
 
   sub skip_tests { return }
 
   =cut
 
 

From POE::Loop::Tk

   =for poe_tests
 
   sub skip_tests {
     return "Tk needs a DISPLAY (set one today, okay?)" unless (
       (defined $ENV{DISPLAY} and length $ENV{DISPLAY}) or $^O eq "MSWin32"
     );
     my $test_name = shift;
     if ($test_name eq "k_signals_rerun" and $^O eq "MSWin32") {
       return "This test crashes Perl when run with Tk on $^O";
     }
     return "Tk tests require the Tk module" if do { eval "use Tk"; $@ };
     return;
   }
 
   =cut
 
 

INSTALL SCRIPT INTEGRATION

The POE::Loop tests started out as part of the POE distribution. All the recommendations and examples that follow are written and tested against ExtUtils::MakeMaker because that's what POE uses. Please adjust these recipes according to your taste and preference.

Calling the Test Generator

Tests need to be generated prior to the user or CPAN shell running ``make test''. A tidy way to do this might be to create a new Makefile target and include that as a dependency for ``make test''. POE takes a simpler approach, calling the script from its Makefile.PL:

   system(
     $^X, "poe-gen-tests", "--dirbase", "t/30_loops",
     "--loop", "Event", "--loop", "Gtk", "--loop", "IO::Poll",
     "--loop", "Select", "--loop", "Tk",
   ) and die $!;
 
 

The previous approach generates tests at install time, so it's not necessary to include the generated files in the MANIFEST. Test directories should also be excluded from the MANIFEST. poe-gen-tests will create the necessary paths.

It's also possible to generate the tests prior to ``make dist''. The distribution's MANIFEST must include the generated files in this case.

Most people will not need to add the generated tests to their repositories.

Running the Tests

By default, ExtUtils::MakeMaker generates Makefiles that only run tests matching t/*.t. However authors are allowed to specify other test locations. Add the following parameter to WriteMakefile() so that the tests generated above will be executed:

   tests => {
     TESTS => "t/*.t t/30_loops/*/*.t",
   }
 
 

CLEANING UP

Makefiles will not clean up files that aren't present in the MANIFEST. This includes tests generated at install time. If this bothers you, you'll need to add directives to include the generated tests in the ``clean'' and ``distclean'' targets.

   clean => {
     FILES => "t/30_loops/*/* t/30_loops/*",
   }
 
 

This assumes the ``t/30_loops'' directory contains only generated tests. It's recommended that generated and hand-coded tests not coexist in the same directory.

It seems like a good idea to delete the deeper directories and files before their parents.

Skipping Network Tests

Some generated tests require a network to be present and accessible. Those tests will be skipped unless the file ``run_network_tests'' is present in the main distribution directory. You can include that file in your distribution's tarball, but it's better create it at install time after asking the user. Here's how POE does it. Naturally you're free to do it some other way.

   # Switch to default behavior if STDIN isn't a tty.
 
   unless (-t STDIN) {
     warn(
       "\n",
       "=============================================\n\n",
       "STDIN is not a terminal.  Assuming --default.\n\n",
       "=============================================\n\n",
     );
     push @ARGV, "--default";
   }
 
   # Remind the user she can use --default.
 
   unless (grep /^--default$/, @ARGV) {
     warn(
       "\n",
       "================================================\n\n",
       "Prompts may be bypassed with the --default flag.\n\n",
       "================================================\n\n",
     );
   }
 
   # Should we run the network tests?
 
   my $prompt = (
     "Some of POE's tests require a functional network.\n" .
     "You can skip these tests if you'd like.\n\n" .
     "Would you like to skip the network tests?"
   );
 
   my $ret = "n";
   if (grep /^--default$/, @ARGV) {
     print $prompt, " [$ret] $ret\n\n";
   }
   else {
     $ret = prompt($prompt, "n");
   }
 
   my $marker = 'run_network_tests';
   unlink $marker;
   unless ($ret =~ /^Y$/i) {
     open(TOUCH,"+>$marker") and close TOUCH;
   }
 
   print "\n";
 
 

Skipping Other Tests

POE's loop tests will enable or disable tests based on the event loop's capabilities. Distributions and event loops may set these variables to signal which tests are okay to run.

POE_LOOP_USES_POLL

Some platforms do not support poll() on certain kinds of filehandles. Event loops that use poll() should set this environment variable to a true value. It will cause the tests to skip this troublesome combination.

SEE ALSO

POE::Test::Loops and POE::Loop.

AUTHOR & COPYRIGHT

Rocco Caputo <rcaputo@cpan.org>. Benjamin Smith <bsmith@cpan.org>. Countless other people.

These tests are Copyright 1998-2008 by Rocco Caputo, Benjamin Smith, and countless contributors. All rights are reserved. These tests are free software; you may redistribute them and/or modify them under the same terms as Perl itself.

Thanks to Martijn van Beers for beta testing and suggestions.