GtkContainer: Add a test for 'invalid ID'

...and add all the container tests to Makefile.am

testsuite/gtk/Makefile.am

@@ -185,6 +185,14 @@ test_ui =						\
 	ui/celllayout5.ui ui/celllayout5.expected	\
 	ui/celllayout6.ui ui/celllayout6.expected	\
 	ui/celllayout7.ui ui/celllayout7.expected	\
+	ui/container1.ui ui/container1.expected		\
+	ui/container2.ui ui/container2.expected		\
+	ui/container3.ui ui/container3.expected		\
+	ui/container4.ui ui/container4.expected		\
+	ui/container5.ui ui/container5.expected		\
+	ui/container6.ui ui/container6.expected		\
+	ui/container7.ui ui/container7.expected		\
+	ui/container8.ui ui/container8.expected		\
 	ui/scale1.ui ui/scale1.expected			\
 	ui/scale2.ui ui/scale2.expected			\
 	ui/scale3.ui ui/scale3.expected			\

testsuite/gtk/ui/container8.expected

@@ -0,0 +1,2 @@
+ERROR: gtk-builder-error-quark 13
+.:11:29 Object with ID xyzzy not found

testsuite/gtk/ui/container8.ui

@@ -0,0 +1,14 @@
+<!-- test invalid id in container markup -->
+<interface>
+  <object class="GtkBox">
+    <child>
+      <object class="GtkLabel" id="widget1"/>
+      <packing>
+        <property name="expand" translatable="yes" comments="foo" context="bar">True</property>
+      </packing>
+    </child>
+    <focus-chain>
+      <widget name="xyzzy"/>
+    </focus-chain>
+  </object>
+</interface>