diff --git a/src/tests/test-client.c b/src/tests/test-client.c
index 59915743a..f1d004cd6 100644
--- a/src/tests/test-client.c
+++ b/src/tests/test-client.c
@@ -239,6 +239,22 @@ process_line (const char *line)
 
       gtk_window_present (GTK_WINDOW (window));
     }
+  else if (strcmp (argv[0], "resize") == 0)
+    {
+      if (argc != 4)
+        {
+          g_print ("usage: resize <id> <width> <height>");
+          goto out;
+        }
+
+      GtkWidget *window = lookup_window (argv[1]);
+      if (!window)
+        goto out;
+
+      int width = atoi (argv[2]);
+      int height = atoi (argv[3]);
+      gtk_window_resize (GTK_WINDOW (window), width, height);
+    }
   else if (strcmp (argv[0], "raise") == 0)
     {
       if (argc != 2)