[mutter] tests: Add missing stacking tests

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 8dbe4210b4930a7a1d1d2d9f2609e03b2820182f
Author: Marco Trevisan (Treviño) <mail 3v1n0 net>
Date:   Tue Nov 13 07:52:02 2018 +0100

    tests: Add missing stacking tests
    
    List all .metatest files that were added only to autotools while they are
    missing since the meson port.
    
    https://gitlab.gnome.org/GNOME/mutter/merge_requests/442

 src/tests/meson.build | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/src/tests/meson.build b/src/tests/meson.build
index f60fa729e..fd9a34803 100644
--- a/src/tests/meson.build
+++ b/src/tests/meson.build
@@ -104,10 +104,13 @@ headless_start_test = executable('mutter-headless-start-test',
 stacking_tests = files([
   'stacking/basic-x11.metatest',
   'stacking/basic-wayland.metatest',
+  'stacking/client-side-decorated.metatest',
+  'stacking/closed-transient.metatest',
   'stacking/minimized.metatest',
   'stacking/mixed-windows.metatest',
   'stacking/set-parent.metatest',
   'stacking/override-redirect.metatest',
+  'stacking/set-parent-exported.metatest',
 ])
 
 test('mutter/stacking', test_runner,