Use ArrayRefs instead of Rects where possible, add t/10-dock.t

testcases/t/10-dock.t

@@ -0,0 +1,41 @@
+#!perl
+# vim:ts=4:sw=4:expandtab
+
+use Test::More tests => 2;
+use Test::Deep;
+use X11::XCB qw(:all);
+use Data::Dumper;
+use Time::HiRes qw(sleep);
+use FindBin;
+use lib "$FindBin::Bin/lib";
+use i3test;
+
+BEGIN {
+    #use_ok('IO::Socket::UNIX') or BAIL_OUT('Cannot load IO::Socket::UNIX');
+    use_ok('X11::XCB::Connection') or BAIL_OUT('Cannot load X11::XCB::Connection');
+}
+
+X11::XCB::Connection->connect(':0');
+
+#####################################################################
+# Create a dock window and see if it gets managed
+#####################################################################
+
+my $window = X11::XCB::Window->new(
+    class => WINDOW_CLASS_INPUT_OUTPUT,
+    rect => [ 0, 0, 30, 30],
+    #override_redirect => 1,
+    background_color => 12632256,
+    type => 'dock',
+);
+
+$window->create;
+$window->map;
+
+diag("dimensions before sleep: " . Dumper($window->rect));
+
+sleep 0.25;
+
+# TODO: check if it is as wide as the screen is
+
+diag("dimensions after sleep: " . Dumper($window->rect));