Update to Drupal 8.0.0 beta 14. For more information, see https://drupal.org/node/2544542

core/modules/config/src/Tests/CacheabilityMetadataConfigOverrideIntegrationTest.php

@@ -0,0 +1,65 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\config\Tests\CacheabilityMetadataConfigOverrideIntegrationTest.
+ */
+
+namespace Drupal\config\Tests;
+
+use Drupal\simpletest\WebTestBase;
+
+/**
+ * Tests if configuration overrides correctly affect cacheability metadata.
+ *
+ * @group config
+ */
+class CacheabilityMetadataConfigOverrideIntegrationTest extends WebTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = [
+    'block_test',
+    'config_override_integration_test',
+  ];
+
+  /**
+   * {@inheritdoc}
+   */
+  public function setUp() {
+    parent::setUp();
+
+    // @todo If our block does not contain any content then the cache context
+    //   is not bubbling up and the test fails. Remove this line once the cache
+    //   contexts are properly set. See https://www.drupal.org/node/2529980.
+    \Drupal::state()->set('block_test.content', 'Needs to have some content');
+
+    $this->drupalLogin($this->drupalCreateUser());
+  }
+
+  /**
+   * Tests if config overrides correctly set cacheability metadata.
+   */
+  public function testConfigOverride() {
+    // Check the default (disabled) state of the cache context. The block label
+    // should not be overridden.
+    $this->drupalGet('<front>');
+    $this->assertNoText('Overridden block label');
+
+    // Both the cache context and tag should be present.
+    $this->assertCacheContext('config_override_integration_test');
+    $this->assertCacheTag('config_override_integration_test_tag');
+
+    // Flip the state of the cache context. The block label should now be
+    // overridden.
+    \Drupal::state()->set('config_override_integration_test.enabled', TRUE);
+    $this->drupalGet('<front>');
+    $this->assertText('Overridden block label');
+
+    // Both the cache context and tag should still be present.
+    $this->assertCacheContext('config_override_integration_test');
+    $this->assertCacheTag('config_override_integration_test_tag');
+  }
+
+}