Update test example app to allow testing of wrapping;

Work relating to #341.

test/support/examples/material_colours_app.rb

@@ -273,6 +273,16 @@ class VedeuMaterialColoursApp
     zindex(0)
   end
 
+  Vedeu.interface 'wrapping' do
+    colour background: '#555555', foreground: '#ffffff'
+    geometry do
+      x 3
+      xn 13
+      y 36
+      yn 39
+    end
+  end
+
   Vedeu.keymap('_global_') do
     key(:up)    { Vedeu.trigger(:_cursor_up_)     }
     key(:right) { Vedeu.trigger(:_cursor_right_)  }
@@ -583,6 +593,11 @@ class VedeuMaterialColoursApp
         line 'style'
       end
     end
+    view('wrapping') do
+      lines do
+        line { text 'This is a line of text that should wrap.', mode: :wrap }
+      end
+    end
   end
 
   Vedeu.focus_by_name 'main_interface'