updated core

modules/simpletest/tests/form_test.module

@@ -918,6 +918,24 @@ function form_test_storage_page_cache_rebuild($form, &$form_state) {
   $form_state['rebuild'] = TRUE;
 }
 
+/**
+ * A simple form for testing form caching.
+ */
+function form_test_cache_form($form, &$form_state) {
+  $form['title'] = array(
+    '#type' => 'textfield',
+    '#title' => 'Title',
+    '#required' => TRUE,
+  );
+
+  $form['submit'] = array(
+    '#type' => 'submit',
+    '#value' => 'Save',
+  );
+
+  return $form;
+}
+
 /**
  * A form for testing form labels and required marks.
  */