Add testcase for resizing of floating windows

testcases/t/12-floating-resize.t

@@ -0,0 +1,83 @@
+#!perl
+# vim:ts=4:sw=4:expandtab
+# Beware that this test uses workspace 9 to perform some tests (it expects
+# the workspace to be empty).
+# TODO: skip it by default?
+
+use Test::More tests => 16;
+use Test::Deep;
+use X11::XCB qw(:all);
+use Data::Dumper;
+use Time::HiRes qw(sleep);
+use FindBin;
+use Digest::SHA1 qw(sha1_base64);
+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');
+}
+
+my $x = X11::XCB::Connection->new;
+
+my $sock = IO::Socket::UNIX->new(Peer => '/tmp/i3-ipc.sock');
+isa_ok($sock, 'IO::Socket::UNIX');
+
+# Switch to the nineth workspace
+$sock->write(i3test::format_ipc_command("9"));
+
+sleep 0.25;
+
+#####################################################################
+# Create a floating window and see if resizing works
+#####################################################################
+
+# Create a floating window
+my $window = $x->root->create_child(
+    class => WINDOW_CLASS_INPUT_OUTPUT,
+    rect => [ 0, 0, 30, 30],
+    background_color => '#C0C0C0',
+    # replace the type with 'utility' as soon as the coercion works again in X11::XCB
+    type => $x->atom(name => '_NET_WM_WINDOW_TYPE_UTILITY'),
+);
+
+isa_ok($window, 'X11::XCB::Window');
+
+$window->map;
+sleep 0.25;
+
+
+sub test_resize {
+    $window->rect(X11::XCB::Rect->new(x => 0, y => 0, width => 100, height => 100));
+
+    my ($absolute, $top) = $window->rect;
+
+    # Make sure the width/height are different from what we’re gonna test, so
+    # that the test will work.
+    isnt($absolute->width, 300, 'width != 300');
+    isnt($absolute->height, 500, 'height != 500');
+
+    $window->rect(X11::XCB::Rect->new(x => 0, y => 0, width => 300, height => 500));
+    sleep 0.25;
+
+    ($absolute, $top) = $window->rect;
+
+    is($absolute->width, 300, 'width = 300');
+    is($absolute->height, 500, 'height = 500');
+}
+
+# Test with default border
+test_resize;
+
+# Test borderless
+$sock->write(i3test::format_ipc_command("bb"));
+sleep 0.25;
+
+test_resize;
+
+# Test with 1-px-border
+$sock->write(i3test::format_ipc_command("bp"));
+sleep 0.25;
+
+test_resize;