diff --git a/core/modules/views/lib/Drupal/views/Tests/QueryGroupByTest.php b/core/modules/views/lib/Drupal/views/Tests/QueryGroupByTest.php
index 08474d8..6b4968d 100644
--- a/core/modules/views/lib/Drupal/views/Tests/QueryGroupByTest.php
+++ b/core/modules/views/lib/Drupal/views/Tests/QueryGroupByTest.php
@@ -68,8 +68,8 @@ public function testAggregateCount() {
       $types[$item->entity_test_name] = $item->num_records;
     }
 
-    $this->assertEqual($types['name1'], 4);
-    $this->assertEqual($types['name2'], 3);
+    $this->assertEqual($types['name1'], 4, 'Groupby the name: name1 returned the expected amount of results.');
+    $this->assertEqual($types['name2'], 3, 'Groupby the name: name2 returned the expected amount of results.');
   }
 
   /**
@@ -94,8 +94,8 @@ function groupByTestHelper($aggregation_function, $values) {
     foreach ($view->result as $item) {
       $results[$item->entity_test_name] = $item->id;
     }
-    $this->assertEqual($results['name1'], $values[0]);
-    $this->assertEqual($results['name2'], $values[1]);
+    $this->assertEqual($results['name1'], $values[0], format_string('Aggregation with @aggregation_function and groupby name: name1 returned the expected amount of results', array('@aggregation_function' => $aggregation_function)));
+    $this->assertEqual($results['name2'], $values[1], format_string('Aggregation with @aggregation_function and groupby name: name2 returned the expected amount of results', array('@aggregation_function' => $aggregation_function)));
   }
 
   /**