commit 117955fd9b6d8532f9ec8da3324b3f426b275778
Author: Matthew Radcliffe <mradcliffe@softpixel.com>
Date:   Sat Aug 17 13:15:28 2013 -0500

    Issue #2049465 by andypost: Use container for config_factory instead of \Drupal::config() per meta issue.

diff --git a/core/modules/system/lib/Drupal/system/Tests/Upgrade/ImageUpgradePathTest.php b/core/modules/system/lib/Drupal/system/Tests/Upgrade/ImageUpgradePathTest.php
index 2ff1623..a0cfddf 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Upgrade/ImageUpgradePathTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Upgrade/ImageUpgradePathTest.php
@@ -73,8 +73,9 @@ public function testImageStyleUpgrade() {
         ),
       ),
     );
+    $config_factory = $this->container->get('config.factory');
     foreach ($expected_styles as $name => $style) {
-      $configured_style = \Drupal::config('image.style.' . $name)->get();
+      $configured_style = $config_factory->get('image.style.' . $name)->get();
       // Replace placeholder with image effect name keys with UUID's generated
       // during by the image style upgrade functions.
       foreach ($configured_style['effects'] as $uuid => $effect) {