diff --git a/core/lib/Drupal/Core/KeyValueStore/KeyValueStoreSortedSetInterface.php b/core/lib/Drupal/Core/KeyValueStore/KeyValueStoreSortedSetInterface.php
index 2669256..4624ab3 100644
--- a/core/lib/Drupal/Core/KeyValueStore/KeyValueStoreSortedSetInterface.php
+++ b/core/lib/Drupal/Core/KeyValueStore/KeyValueStoreSortedSetInterface.php
@@ -6,9 +6,8 @@
  * Defines the interface for sorted data in a key/value store.
  *
  * An example would be sequential log of data ordered by key of current time.
- * A value would generally just exist once, but a key could be used multiple
- * times for items in the same position in a sequence. This is based on the
- * Redis Sorted Sets.
+ * A value can just exist once, but a key could be used multiple times for items
+ * in the same position in a sequence. This is based on the Redis sorted sets.
  */
 interface KeyValueStoreSortedSetInterface {
 
diff --git a/core/tests/Drupal/KernelTests/Core/KeyValueStore/DatabaseStorageSortedSetTest.php b/core/tests/Drupal/KernelTests/Core/KeyValueStore/DatabaseStorageSortedSetTest.php
index 0bba558..034b322 100644
--- a/core/tests/Drupal/KernelTests/Core/KeyValueStore/DatabaseStorageSortedSetTest.php
+++ b/core/tests/Drupal/KernelTests/Core/KeyValueStore/DatabaseStorageSortedSetTest.php
@@ -2,7 +2,6 @@
 
 namespace Drupal\KernelTests\Core\KeyValueStore;
 
-use Drupal\Core\Database\DatabaseExceptionWrapper;
 use Drupal\KernelTests\KernelTestBase;
 
 /**
@@ -13,7 +12,7 @@
 class DatabaseStorageSortedSetTest extends KernelTestBase {
 
 
-  static public $modules = array('system', 'serialization');
+  static public $modules = ['system', 'serialization'];
 
   /**
    * @var string
@@ -104,39 +103,42 @@ public function testCalls() {
     $key0 = $this->newKey();
     $value0 = $this->randomMachineName();
     $this->store->add($key0, $value0);
-    $this->assertPairs(array($key0 => $value0));
+    $this->assertPairs([$key0 => $value0]);
 
     $key1 = $this->newKey();
     $value1 = $this->randomMachineName();
     $this->store->add($key1, $value1);
-    $this->assertPairs(array($key1 => $value1));
+    $this->assertPairs([$key1 => $value1]);
 
     // Ensure it works to add sets with the same key.
     $key2 = $this->newKey();
     $value2 = $this->randomMachineName();
     $value3 = $this->randomMachineName();
     $value4 = $this->randomMachineName();
-    $this->store->addMultiple(array(
-      array($key2 => $value2),
-      array($key2 => $value3),
-      array($key2 => $value4),
-    ));
+    $this->store->addMultiple([
+      [$key2 => $value2],
+      [$key2 => $value3],
+      [$key2 => $value4],
+    ]);
 
     $count = $this->store->getCount();
     $this->assertEquals(5, $count, 'The count method returned correct count.');
 
     $value = $this->store->getRange($key1, $key2);
-    $this->assertSame($value, array($value1, $value2, $value3, $value4));
+    $this->assertSame($value, [$value1, $value2, $value3, $value4]);
+
+    $value = $this->store->getRange($key1);
+    $this->assertSame($value, [$value1, $value2, $value3, $value4]);
 
     $new1 = $this->newKey();
     $this->store->add($new1, $value1);
 
     $value = $this->store->getRange($new1, $new1);
-    $this->assertSame($value, array($value1), 'Value was successfully updated.');
+    $this->assertSame($value, [$value1], 'Value was successfully updated.');
     $this->assertRecords(5, 'Correct number of record in the collection after value update.');
 
     $value = $this->store->getRange($key1, $key1);
-    $this->assertSame($value, array(), 'Non-existing range returned empty array.');
+    $this->assertSame($value, [], 'Non-existing range returned empty array.');
 
     $max_key = $this->store->getMaxKey();
     $this->assertEquals($max_key, $new1, 'The getMaxKey method returned correct key.');