[gtk/gtk-3-24] Update css node tests

[Matthias Clasen <matthiasc src gnome org>]

commit df77965153c1f1940407c167e92b56b19e0a3769
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Feb 5 09:32:57 2019 -0500

    Update css node tests
    
    The GtkSwitch now has two image nodes.

 testsuite/css/nodes/buttons.nodes | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)
---
diff --git a/testsuite/css/nodes/buttons.nodes b/testsuite/css/nodes/buttons.nodes
index 418a132399..e19da6abfb 100644
--- a/testsuite/css/nodes/buttons.nodes
+++ b/testsuite/css/nodes/buttons.nodes
@@ -13,9 +13,13 @@
       radio:dir(ltr)
       label:dir(ltr)
     switch:dir(ltr):checked
-      slider
+      slider:dir(ltr):checked
+      image:dir(ltr):checked
+      image:dir(ltr):checked
     switch:dir(ltr)
       slider
+      image:dir(ltr)
+      image:dir(ltr)
     button.text-button:dir(ltr)
       label:dir(ltr)
     button.image-button:dir(ltr)