commit 6030e52e784e186e6f44068c7560ba4183e5ec99
Author: Tim Plunkett <git@plnktt.com>
Date:   Wed May 27 10:26:47 2015 -0400

    adjust ajax form page cache test.

diff --git a/core/modules/system/src/Tests/Ajax/AjaxFormPageCacheTest.php b/core/modules/system/src/Tests/Ajax/AjaxFormPageCacheTest.php
index c5dafbe..03727b6 100644
--- a/core/modules/system/src/Tests/Ajax/AjaxFormPageCacheTest.php
+++ b/core/modules/system/src/Tests/Ajax/AjaxFormPageCacheTest.php
@@ -54,9 +54,15 @@ public function testSimpleAJAXFormValue() {
    $this->assertCommand($commands, $expected, 'Build id change command issued on first AJAX submission');
 
    $edit = ['select' => 'red'];
-   $this->drupalPostAjaxForm(NULL, $edit, 'select');
+   $commands = $this->drupalPostAjaxForm(NULL, $edit, 'select');
    $build_id_second_ajax = $this->getFormBuildId();
-   $this->assertEqual($build_id_first_ajax, $build_id_second_ajax, 'Build id remains the same on subsequent AJAX submissions');
+   $this->assertNotEqual($build_id_first_ajax, $build_id_second_ajax, 'Build id changes on subsequent AJAX submissions');
+   $expected = [
+     'command' => 'update_build_id',
+     'old' => $build_id_first_ajax,
+     'new' => $build_id_second_ajax,
+   ];
+   $this->assertCommand($commands, $expected, 'Build id change command issued on subsequent AJAX submissions');
 
    // Repeat the test sequence but this time with a page loaded from the cache.
    $this->drupalGet('ajax_forms_test_get_form');
@@ -77,9 +83,15 @@ public function testSimpleAJAXFormValue() {
    $this->assertCommand($commands, $expected, 'Build id change command issued on first AJAX submission');
 
    $edit = ['select' => 'red'];
-   $this->drupalPostAjaxForm(NULL, $edit, 'select');
+   $commands = $this->drupalPostAjaxForm(NULL, $edit, 'select');
    $build_id_from_cache_second_ajax = $this->getFormBuildId();
-   $this->assertEqual($build_id_from_cache_first_ajax, $build_id_from_cache_second_ajax, 'Build id remains the same on subsequent AJAX submissions');
+   $this->assertNotEqual($build_id_from_cache_first_ajax, $build_id_from_cache_second_ajax, 'Build id changes on subsequent AJAX submissions');
+   $expected = [
+     'command' => 'update_build_id',
+     'old' => $build_id_from_cache_first_ajax,
+     'new' => $build_id_from_cache_second_ajax,
+   ];
+   $this->assertCommand($commands, $expected, 'Build id change command issued on subsequent AJAX submissions');
  }
 
   /**