These tests contain non-canonical and non-existing property names.
--- /dev/null
+<!-- missing attribute in dialog markup -->
+<interface>
+ <object class="GtkDialog">
+ <child type="action">
+ <object class="GtkButton" id="button_ok">
+ <property name="can_default">1</property>
+ </object>
+ </child>
+ </object>
+</interface>
--- /dev/null
+ERROR: gtk-builder-error-quark 11
+.:6:39 Invalid property: GtkButton.cantdefault
--- /dev/null
+<!-- missing attribute in dialog markup -->
+<interface>
+ <object class="GtkDialog">
+ <child type="action">
+ <object class="GtkButton" id="button_ok">
+ <property name="cantdefault">1</property>
+ </object>
+ </child>
+ </object>
+</interface>