[mutter/gnome-3-28] tests: Add "closed-transient" test

[Marco Trevisan <marcotrevi src gnome org>]

commit 0a09a3c9063230d9a3f170371f93d2d2280d8e06
Author: Florian Müllner <fmuellner gnome org>
Date:   Thu Jul 19 11:47:12 2018 +0200

    tests: Add "closed-transient" test
    
    When a transient window is destroyed, the expected behavior is that
    focus is passed to the ancestor if possible. This was broken for
    quite a while until the previous commit, so add a test case to make
    sure it doesn't happen again.
    
    https://gitlab.gnome.org/GNOME/mutter/issues/15
    
    (cherry-picked from commit 137f22236cba5f2583d8db3d957e3926d1f7f668)

 src/Makefile-tests.am                        |  1 +
 src/tests/stacking/closed-transient.metatest | 19 +++++++++++++++++++
 2 files changed, 20 insertions(+)
---
diff --git a/src/Makefile-tests.am b/src/Makefile-tests.am
index 72706e2bd..4be832cc9 100644
--- a/src/Makefile-tests.am
+++ b/src/Makefile-tests.am
@@ -14,6 +14,7 @@ stackingdir = $(pkgdatadir)/tests/stacking
 dist_stacking_DATA =                           \
        tests/stacking/basic-x11.metatest       \
        tests/stacking/basic-wayland.metatest   \
+       tests/stacking/closed-transient.metatest        \
        tests/stacking/minimized.metatest       \
        tests/stacking/mixed-windows.metatest   \
        tests/stacking/set-parent.metatest      \
diff --git a/src/tests/stacking/closed-transient.metatest b/src/tests/stacking/closed-transient.metatest
new file mode 100644
index 000000000..5ca95ba0f
--- /dev/null
+++ b/src/tests/stacking/closed-transient.metatest
@@ -0,0 +1,19 @@
+new_client 1 wayland
+create 1/1
+show 1/1
+
+new_client 2 wayland
+create 2/1
+show 2/1
+
+create 1/2
+show 1/2
+set_parent 1/2 1
+
+wait
+assert_stacking 1/1 2/1 1/2
+
+destroy 1/2
+
+wait
+assert_stacking 2/1 1/1