diff -u b/core/modules/statistics/src/Plugin/migrate/destination/NodeCounter.php b/core/modules/statistics/src/Plugin/migrate/destination/NodeCounter.php
--- b/core/modules/statistics/src/Plugin/migrate/destination/NodeCounter.php
+++ b/core/modules/statistics/src/Plugin/migrate/destination/NodeCounter.php
@@ -79,7 +79,7 @@
   /**
    * {@inheritdoc}
    */
-  public function import(Row $row, array $old_destination_id_values = array()) {
+  public function import(Row $row, array $old_destination_id_values = []) {
     return (bool) $this->connection
       ->insert('node_counter')
       ->fields([
diff -u b/core/modules/statistics/tests/src/Kernel/Migrate/d6/MigrateNodeCounterTest.php b/core/modules/statistics/tests/src/Kernel/Migrate/d6/MigrateNodeCounterTest.php
--- b/core/modules/statistics/tests/src/Kernel/Migrate/d6/MigrateNodeCounterTest.php
+++ b/core/modules/statistics/tests/src/Kernel/Migrate/d6/MigrateNodeCounterTest.php
@@ -2,11 +2,10 @@
 
 namespace Drupal\Tests\statistics\Kernel\Migrate\d6;
 
-use Drupal\statistics\StatisticsViewsResult;
 use Drupal\Tests\migrate_drupal\Kernel\d6\MigrateDrupal6TestBase;
 
 /**
- * Upgrade node counter.
+ * Tests the migration of node counter data to Drupal 8.
  *
  * @group statistics
  */
diff -u b/core/modules/statistics/tests/src/Kernel/Migrate/d7/MigrateNodeCounterTest.php b/core/modules/statistics/tests/src/Kernel/Migrate/d7/MigrateNodeCounterTest.php
--- b/core/modules/statistics/tests/src/Kernel/Migrate/d7/MigrateNodeCounterTest.php
+++ b/core/modules/statistics/tests/src/Kernel/Migrate/d7/MigrateNodeCounterTest.php
@@ -2,11 +2,10 @@
 
 namespace Drupal\Tests\statistics\Kernel\Migrate\d7;
 
-use Drupal\statistics\StatisticsViewsResult;
 use Drupal\Tests\migrate_drupal\Kernel\d7\MigrateDrupal7TestBase;
 
 /**
- * Upgrade node counter.
+ * Tests the migration of node counter data to Drupal 8.
  *
  * @group statistics
  */
diff -u b/core/modules/statistics/tests/src/Kernel/Plugin/migrate/source/NodeCounterTest.php b/core/modules/statistics/tests/src/Kernel/Plugin/migrate/source/NodeCounterTest.php
--- b/core/modules/statistics/tests/src/Kernel/Plugin/migrate/source/NodeCounterTest.php
+++ b/core/modules/statistics/tests/src/Kernel/Plugin/migrate/source/NodeCounterTest.php
@@ -8,6 +8,7 @@
  * Tests the node_counter source plugin.
  *
  * @covers \Drupal\statistics\Plugin\migrate\source\NodeCounter
+ *
  * @group statistics
  */
 class NodeCounterTest extends MigrateSqlSourceTestBase {