1 files changed, 19 insertions, 0 deletions
diff --git a/modules/simpletest/tests/update_test_2.install b/modules/simpletest/tests/update_test_2.install
index e2b4fb25f..e12b77b93 100644
--- a/modules/simpletest/tests/update_test_2.install
+++ b/modules/simpletest/tests/update_test_2.install
@@ -8,11 +8,30 @@
 
 /**
  * Implements hook_update_dependencies().
+ *
+ * @see update_test_1_update_dependencies()
+ * @see update_test_3_update_dependencies()
  */
 function update_test_2_update_dependencies() {
+  // Combined with update_test_3_update_dependencies(), we are declaring here
+  // that these two modules run updates in the following order:
+  // 1. update_test_2_update_7000()
+  // 2. update_test_3_update_7000()
+  // 3. update_test_2_update_7001()
+  // 4. update_test_2_update_7002()
   $dependencies['update_test_2'][7001] = array(
     'update_test_3' => 7000,
   );
+
+  // These are coordinated with the corresponding dependencies declared in
+  // update_test_1_update_dependencies().
+  $dependencies['system'][7000] = array(
+    'update_test_2' => 7001,
+  );
+  $dependencies['system'][7001] = array(
+    'update_test_1' => 7001,
+  );
+
   return $dependencies;
 }