diff --git a/tests/samples/child_type.blp b/tests/samples/child_type.blp
index 8d9f4d7..d549f1c 100644
--- a/tests/samples/child_type.blp
+++ b/tests/samples/child_type.blp
@@ -5,3 +5,9 @@ Window {
   HeaderBar {
   }
 }
+
+Dialog {
+  [internal-child context_area]
+  Box {
+  }
+}
diff --git a/tests/samples/child_type.ui b/tests/samples/child_type.ui
index 2961bfd..ea9d435 100644
--- a/tests/samples/child_type.ui
+++ b/tests/samples/child_type.ui
@@ -6,4 +6,9 @@
       <object class="GtkHeaderBar"></object>
     </child>
   </object>
+  <object class="GtkDialog">
+    <child internal-child="context_area">
+      <object class="GtkBox"></object>
+    </child>
+  </object>
 </interface>