[mutter] tests: Add the "parent_exported" test

[Jonas Ådahl <jadahl src gnome org>]

commit 7749f4d98329c42a14b2913e10e4d0712d62bfa2
Author: Olivier Fourdan <ofourdan redhat com>
Date:   Fri Jul 13 16:44:25 2018 +0200

    tests: Add the "parent_exported" test
    
    This test aims at checking that the transient relationship set using the
    xdg-foreign API is respected by mutter and that no crash occurs, such as
    the one in issue !174.
    
    Note: the crash from issue !174 occurs only if "attach_modal_dialogs" is
    set, so one has to change that default value to "true" to be able to
    trigger the crash:
    
        gsettings set org.gnome.mutter attach-modal-dialogs true
    
    Related: https://gitlab.gnome.org/GNOME/mutter/issues/174

 src/Makefile-tests.am                           |  1 +
 src/tests/stacking/set-parent-exported.metatest | 15 +++++++++++++++
 2 files changed, 16 insertions(+)
---
diff --git a/src/Makefile-tests.am b/src/Makefile-tests.am
index 82778b2f5..63a5fd7be 100644
--- a/src/Makefile-tests.am
+++ b/src/Makefile-tests.am
@@ -17,6 +17,7 @@ dist_stacking_DATA =                                          \
        $(srcdir)/tests/stacking/minimized.metatest     \
        $(srcdir)/tests/stacking/mixed-windows.metatest     \
        $(srcdir)/tests/stacking/set-parent.metatest    \
+       $(srcdir)/tests/stacking/set-parent-exported.metatest   \
        $(srcdir)/tests/stacking/override-redirect.metatest
 
 mutter-all.test: tests/mutter-all.test.in
diff --git a/src/tests/stacking/set-parent-exported.metatest b/src/tests/stacking/set-parent-exported.metatest
new file mode 100644
index 000000000..8dbb9c932
--- /dev/null
+++ b/src/tests/stacking/set-parent-exported.metatest
@@ -0,0 +1,15 @@
+new_client 1 wayland
+create 1/1
+show 1/1
+create 1/2
+show 1/2
+wait
+
+set_parent_exported 1/1 2
+wait
+assert_stacking 1/2 1/1
+
+local_activate 1/2
+assert_stacking 1/2 1/1
+
+destroy 1/2