reverted:
--- b/core/modules/statistics/src/Tests/StatisticsInvalidPostTest.php
+++ /dev/null
@@ -1,68 +0,0 @@
-<?php
-
-namespace Drupal\statistics\Tests;
-
-use Drupal\simpletest\WebTestBase;
-
-/**
- * Tests posting to statistics.php with invalid values.
- *
- * @group statistics
- */
-class StatisticsInvalidPostTest extends WebTestBase {
-
-  /**
-   * Modules to enable.
-   *
-   * @var array
-   */
-  public static $modules = ['node', 'statistics'];
-
-  /**
-   * The Guzzle HTTP client.
-   *
-   * @var \GuzzleHttp\Client;
-   */
-  protected $client;
-
-  /**
-   * {@inheritdoc}
-   */
-  protected function setUp() {
-    parent::setUp();
-    $this->client = \Drupal::httpClient();
-    // Enable logging.
-    $this->config('statistics.settings')
-      ->set('count_content_views', 1)
-      ->save();
-  }
-
-  /**
-   * Test if nothing breaks when posting with invalid params.
-   */
-  public function testInvalidPost() {
-
-    // Manually calling statistics.php.
-    $nid = 'a string instead of an integer';
-    $this->client->post($this->buildUrl(drupal_get_path('module', 'statistics') . '/statistics.php'), ['form_params' => ['nid' => $nid]]);
-
-    $result = db_select('node_counter', 'n')
-      ->fields('n', ['nid'])
-      ->condition('n.nid', $nid)
-      ->execute()
-      ->fetchAssoc();
-    $this->assertEqual($result['nid'], [], 'Verifying that nothing is written to the node_counter table.');
-
-    // An id greater than int(10), the maximum nid database limit.
-    $nid = 123456789012;
-    $this->client->post($this->buildUrl(drupal_get_path('module', 'statistics') . '/statistics.php'), ['form_params' => ['nid' => $nid]]);
-
-    $result = db_select('node_counter', 'n')
-      ->fields('n', ['nid'])
-      ->condition('n.nid', $nid)
-      ->execute()
-      ->fetchAssoc();
-    $this->assertEqual($result['nid'], [], 'Verifying that nothing is written to the node_counter table.');
-  }
-
-}
only in patch2:
unchanged:
--- /dev/null
+++ b/core/modules/statistics/tests/src/Functional/StatisticsInvalidPostTest.php
@@ -0,0 +1,40 @@
+<?php
+
+namespace Drupal\Tests\statistics\Functional;
+
+/**
+ * Tests posting to statistics.php with invalid values.
+ *
+ * @group statistics
+ */
+class StatisticsInvalidPostTest extends StatisticsTestBase {
+  /**
+   * Test if nothing breaks when posting with invalid params.
+   */
+  public function testInvalidPost() {
+
+    $client = \Drupal::httpClient();
+    // Manually calling statistics.php.
+    $nid = 'a string instead of an integer';
+    $client->post($this->buildUrl(drupal_get_path('module', 'statistics') . '/statistics.php'), ['form_params' => ['nid' => $nid]]);
+
+    $result = db_select('node_counter', 'n')
+      ->fields('n', ['nid'])
+      ->condition('n.nid', $nid)
+      ->execute()
+      ->fetchAssoc();
+    $this->assertEqual($result['nid'], NULL, 'Verifying that nothing is written to the node_counter table.');
+
+    // An id greater than int(10), the maximum nid database limit.
+    $nid = 123456789012;
+    $client->post($this->buildUrl(drupal_get_path('module', 'statistics') . '/statistics.php'), ['form_params' => ['nid' => $nid]]);
+
+    $result = db_select('node_counter', 'n')
+      ->fields('n', ['nid'])
+      ->condition('n.nid', $nid)
+      ->execute()
+      ->fetchAssoc();
+    $this->assertEqual($result['nid'], NULL, 'Verifying that nothing is written to the node_counter table.');
+  }
+
+}