=== modified file 'modules/system/system.install'
--- modules/system/system.install	2009-09-05 13:05:30 +0000
+++ modules/system/system.install	2009-09-05 14:14:11 +0000
@@ -2468,7 +2468,79 @@ function system_update_7037() {
   return $ret;
 }
 
+
 /**
- * @} End of "defgroup updates-6.x-to-7.x"
- * The next series of updates should start at 8000.
+ * Test update 1. This should succeed and use the legacy return format.
+ *
+ * DO NOT COMMIT THIS FUNCTION.
  */
+function system_update_9001() {
+
+  $ret[] = array('success' => TRUE, 'query' => t('This is the return message.'));
+  return $ret;
+}
+
+/**
+ * Test update 2.  This should succeed.
+ *
+ * DO NOT COMMIT THIS FUNCTION.
+ */
+function system_update_9002() {
+
+  // Do something interesting here.
+  return t('Yay, it worked');
+}
+
+/**
+ * Test update 3. This makes sure batching works.
+ *
+ * DO NOT COMMIT THIS FUNCITON.
+ */
+function system_update_9003(&$sandbox) {
+
+  if (empty($sandbox['step'])) {
+    $sandbox['step'] = 1;
+  }
+
+  if ($sandbox['step'] == 1) {
+    $sandbox['#finished'] = 0.5;
+  }
+  else {
+    unset($sandbox['#finished']);
+  }
+
+  $sandbox['step']++;
+
+  return t('The following value should be 3: ' . $sandbox['step']);
+}
+
+/**
+ * Test update 4.  This should silently pass.
+ *
+ * DO NOT COMMIT THIS FUNCTION.
+ */
+function system_update_9004() {
+
+}
+
+/**
+ * Test update 5.  This should fail.
+ *
+ * DO NOT COMMIT THIS FUNCTION.
+ */
+function system_update_9005() {
+
+  throw new DrupalUpdateException(t('This is an error message.'));
+
+  return t('You should not see this message.');
+}
+
+/**
+ * Test update 6.  This shouldn't even run.
+ *
+ * DO NOT COMMIT THIS FUNCTION.
+ */
+function system_update_9006() {
+  return t('You should not see this message, either.');
+}
+