tests: add testcase for the 'mode' IPC event

testcases/Makefile.PL

@@ -8,7 +8,7 @@ WriteMakefile(
     MIN_PERL_VERSION => '5.010000', # 5.10.0
     PREREQ_PM => {
         'AnyEvent'     => 0,
-        'AnyEvent::I3' => '0.09',
+        'AnyEvent::I3' => '0.14',
         'X11::XCB'     => '0.03',
         'Inline'       => 0,
         'ExtUtils::PkgConfig' => 0,

testcases/t/199-ipc-mode-event.t

@@ -0,0 +1,57 @@
+#!perl
+# vim:ts=4:sw=4:expandtab
+#
+# Please read the following documents before working on tests:
+# • http://build.i3wm.org/docs/testsuite.html
+#   (or docs/testsuite)
+#
+# • http://build.i3wm.org/docs/lib-i3test.html
+#   (alternatively: perldoc ./testcases/lib/i3test.pm)
+#
+# • http://build.i3wm.org/docs/ipc.html
+#   (or docs/ipc)
+#
+# • http://onyxneon.com/books/modern_perl/modern_perl_a4.pdf
+#   (unless you are already familiar with Perl)
+#
+# Verifies that the IPC 'mode' event is sent when modes are changed.
+use i3test i3_autostart => 0;
+
+my $config = <<EOT;
+# i3 config file (v4)
+font -misc-fixed-medium-r-normal--13-120-75-75-C-70-iso10646-1
+
+mode "m1" {
+    bindsym Mod1+x nop foo
+}
+
+mode "with spaces" {
+    bindsym Mod1+y nop bar
+}
+EOT
+
+my $pid = launch_with_config($config);
+
+my $i3 = i3(get_socket_path(0));
+$i3->connect->recv;
+
+my $cv = AnyEvent->condvar;
+
+$i3->subscribe({
+    mode => sub {
+        my ($event) = @_;
+        $cv->send($event->{change} eq 'm1');
+    }
+})->recv;
+
+cmd 'mode "m1"';
+
+# Timeout after 0.5s
+my $t;
+$t = AnyEvent->timer(after => 0.5, cb => sub { $cv->send(0); });
+
+ok($cv->recv, 'Mode event received');
+
+exit_gracefully($pid);
+
+done_testing;