diff --git a/core/modules/statistics/src/Plugin/Block/StatisticsPopularBlock.php b/core/modules/statistics/src/Plugin/Block/StatisticsPopularBlock.php
index d025415..a4317a4 100644
--- a/core/modules/statistics/src/Plugin/Block/StatisticsPopularBlock.php
+++ b/core/modules/statistics/src/Plugin/Block/StatisticsPopularBlock.php
@@ -196,7 +196,7 @@ public function build() {
   /**
    * Generates the ordered array of node links for build().
    *
-   * @param array $counts
+   * @param array $nids
    *   An ordered array of node ids.
    * @param string $title
    *   The title for the list.
diff --git a/core/modules/statistics/src/Tests/StatisticsReportsTest.php b/core/modules/statistics/src/Tests/StatisticsReportsTest.php
index 81510c9..a2dd1dd 100644
--- a/core/modules/statistics/src/Tests/StatisticsReportsTest.php
+++ b/core/modules/statistics/src/Tests/StatisticsReportsTest.php
@@ -54,12 +54,18 @@ function testPopularContentBlock() {
     $this->assertText('All time', 'Found the all time popular content.');
     $this->assertText('Last viewed', 'Found the last viewed popular content.');
 
-    $this->assertCacheTags(array_merge(
-      $node->getCacheTags(),
-      $block->getCacheTags(),
-      $this->blockingUser->getCacheTags(),
-      ['block_view', 'config:block_list', 'node_list', 'rendered', 'user_view']
-    ));
+    $this->assertCacheTags(
+      Cache::mergeTags(
+        Cache::mergeTags(
+          Cache::mergeTags(
+            $node->getCacheTags(),
+            $block->getCacheTags()
+          ),
+          $this->blockingUser->getCacheTags()
+        ),
+        ['block_view', 'config:block_list', 'node_list', 'rendered', 'user_view']
+      )
+    );
     $this->assertCacheContexts($node->getCacheContexts());
 
     // Check if the node link is displayed.