Update to drupal 8.0.0-rc1. For more information, see https://www.drupal.org/node/2582663

core/modules/statistics/src/Tests/Migrate/d6/MigrateStatisticsConfigsTest.php

@@ -20,9 +20,7 @@ class MigrateStatisticsConfigsTest extends MigrateDrupal6TestBase {
   use SchemaCheckTestTrait;
 
   /**
-   * Modules to enable.
-   *
-   * @var array
+   * {@inheritdoc}
    */
   public static $modules = array('statistics');
 

core/modules/statistics/src/Tests/StatisticsAdminTest.php

@@ -47,6 +47,9 @@ class StatisticsAdminTest extends WebTestBase {
   protected function setUp() {
     parent::setUp();
 
+    // Set the max age to 0 to simplify testing.
+    $this->config('statistics.settings')->set('display_max_age', 0)->save();
+
     // Create Basic page node type.
     if ($this->profile != 'standard') {
       $this->drupalCreateContentType(array('type' => 'page', 'name' => 'Basic page'));
@@ -89,6 +92,16 @@ class StatisticsAdminTest extends WebTestBase {
     $this->drupalGet('node/' . $this->testNode->id());
     $this->client->post($stats_path, array('form_params' => $post));
     $this->assertText('2 views', 'Node is viewed 2 times.');
+
+    // Increase the max age to test that nodes are no longer immediately
+    // updated, visit the node once more to populate the cache.
+    $this->config('statistics.settings')->set('display_max_age', 3600)->save();
+    $this->drupalGet('node/' . $this->testNode->id());
+    $this->assertText('3 views', 'Node is viewed 3 times.');
+
+    $this->client->post($stats_path, array('form_params' => $post));
+    $this->drupalGet('node/' . $this->testNode->id());
+    $this->assertText('3 views', 'Views counter was not updated.');
   }
 
   /**

core/modules/statistics/src/Tests/StatisticsAttachedTest.php

@@ -0,0 +1,62 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\statistics\Tests\StatisticsAttachedTest.
+ */
+
+namespace Drupal\statistics\Tests;
+
+use Drupal\simpletest\WebTestBase;
+use Drupal\node\Entity\Node;
+
+/**
+ * Tests if statistics.js is loaded when content is not printed.
+ *
+ * @group statistics
+ */
+class StatisticsAttachedTest extends WebTestBase {
+
+  /**
+   * Modules to enable.
+   *
+   * @var array
+   */
+  public static $modules = array('node', 'statistics');
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+
+    $this->drupalCreateContentType(['type' => 'page']);
+
+    // Install "statistics_test_attached" and set it as the default theme.
+    $theme = 'statistics_test_attached';
+    \Drupal::service('theme_handler')->install(array($theme));
+    $this->config('system.theme')
+      ->set('default', $theme)
+      ->save();
+    // Installing a theme will cause the kernel terminate event to rebuild the
+    // router. Simulate that here.
+    \Drupal::service('router.builder')->rebuildIfNeeded();
+  }
+
+  /**
+   * Tests if statistics.js is loaded when content is not printed.
+   */
+  public function testAttached() {
+
+    $node = Node::create([
+      'type' => 'page',
+      'title' => 'Page node',
+      'body' => 'body text'
+    ]);
+    $node->save();
+    $this->drupalGet('node/' . $node->id());
+
+    $this->assertRaw('core/modules/statistics/statistics.js', 'Statistics library is available');
+  }
+
+}