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diff --git a/web/core/modules/node/tests/src/Functional/NodeAccessGrantsCacheContextTest.php b/web/core/modules/node/tests/src/Functional/NodeAccessGrantsCacheContextTest.php
new file mode 100644
index 000000000..fa2116ab8
--- /dev/null
+++ b/web/core/modules/node/tests/src/Functional/NodeAccessGrantsCacheContextTest.php
@@ -0,0 +1,138 @@
+<?php
+
+namespace Drupal\Tests\node\Functional;
+
+/**
+ * Tests the node access grants cache context service.
+ *
+ * @group node
+ * @group Cache
+ */
+class NodeAccessGrantsCacheContextTest extends NodeTestBase {
+
+  /**
+   * Modules to enable.
+   *
+   * @var array
+   */
+  public static $modules = ['node_access_test'];
+
+  /**
+   * User with permission to view content.
+   */
+  protected $accessUser;
+
+  /**
+   * User without permission to view content.
+   */
+  protected $noAccessUser;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+
+    node_access_rebuild();
+
+    // Create some content.
+    $this->drupalCreateNode();
+    $this->drupalCreateNode();
+    $this->drupalCreateNode();
+    $this->drupalCreateNode();
+
+    // Create user with simple node access permission. The 'node test view'
+    // permission is implemented and granted by the node_access_test module.
+    $this->accessUser = $this->drupalCreateUser(['access content overview', 'access content', 'node test view']);
+    $this->noAccessUser = $this->drupalCreateUser(['access content overview', 'access content']);
+    $this->noAccessUser2 = $this->drupalCreateUser(['access content overview', 'access content']);
+
+    $this->userMapping = [
+      1 => $this->rootUser,
+      2 => $this->accessUser,
+      3 => $this->noAccessUser,
+    ];
+  }
+
+  /**
+   * Asserts that for each given user, the expected cache context is returned.
+   *
+   * @param array $expected
+   *   Expected values, keyed by user ID, expected cache contexts as values.
+   */
+  protected function assertUserCacheContext(array $expected) {
+    foreach ($expected as $uid => $context) {
+      if ($uid > 0) {
+        $this->drupalLogin($this->userMapping[$uid]);
+      }
+      $this->pass('Asserting cache context for user ' . $uid . '.');
+      $this->assertIdentical($context, $this->container->get('cache_context.user.node_grants')->getContext('view'));
+    }
+    $this->drupalLogout();
+  }
+
+  /**
+   * Tests NodeAccessGrantsCacheContext::getContext().
+   */
+  public function testCacheContext() {
+    $this->assertUserCacheContext([
+      0 => 'view.all:0;node_access_test_author:0;node_access_all:0',
+      1 => 'all',
+      2 => 'view.all:0;node_access_test_author:2;node_access_test:8888,8889',
+      3 => 'view.all:0;node_access_test_author:3',
+    ]);
+
+    // Grant view to all nodes (because nid = 0) for users in the
+    // 'node_access_all' realm.
+    $record = [
+      'nid' => 0,
+      'gid' => 0,
+      'realm' => 'node_access_all',
+      'grant_view' => 1,
+      'grant_update' => 0,
+      'grant_delete' => 0,
+    ];
+    db_insert('node_access')->fields($record)->execute();
+
+    // Put user accessUser (uid 0) in the realm.
+    \Drupal::state()->set('node_access_test.no_access_uid', 0);
+    drupal_static_reset('node_access_view_all_nodes');
+    $this->assertUserCacheContext([
+      0 => 'view.all',
+      1 => 'all',
+      2 => 'view.all:0;node_access_test_author:2;node_access_test:8888,8889',
+      3 => 'view.all:0;node_access_test_author:3',
+    ]);
+
+    // Put user accessUser (uid 2) in the realm.
+    \Drupal::state()->set('node_access_test.no_access_uid', $this->accessUser->id());
+    drupal_static_reset('node_access_view_all_nodes');
+    $this->assertUserCacheContext([
+      0 => 'view.all:0;node_access_test_author:0',
+      1 => 'all',
+      2 => 'view.all',
+      3 => 'view.all:0;node_access_test_author:3',
+    ]);
+
+    // Put user noAccessUser (uid 3) in the realm.
+    \Drupal::state()->set('node_access_test.no_access_uid', $this->noAccessUser->id());
+    drupal_static_reset('node_access_view_all_nodes');
+    $this->assertUserCacheContext([
+      0 => 'view.all:0;node_access_test_author:0',
+      1 => 'all',
+      2 => 'view.all:0;node_access_test_author:2;node_access_test:8888,8889',
+      3 => 'view.all',
+    ]);
+
+    // Uninstall the node_access_test module
+    $this->container->get('module_installer')->uninstall(['node_access_test']);
+    drupal_static_reset('node_access_view_all_nodes');
+    $this->assertUserCacheContext([
+      0 => 'view.all',
+      1 => 'all',
+      2 => 'view.all',
+      3 => 'view.all',
+    ]);
+  }
+
+}