diff --git a/core/tests/Drupal/Tests/Core/Authentication/AuthenticationCollectorTest.php b/core/tests/Drupal/Tests/Core/Authentication/AuthenticationCollectorTest.php
index e4d88fc..2fb3a26 100644
--- a/core/tests/Drupal/Tests/Core/Authentication/AuthenticationCollectorTest.php
+++ b/core/tests/Drupal/Tests/Core/Authentication/AuthenticationCollectorTest.php
@@ -19,6 +19,8 @@
 class AuthenticationCollectorTest extends UnitTestCase {
 
   /**
+   * Add test providers to the AuthenticationCollector and test various methods.
+   *
    * @covers ::addProvider
    * @covers ::getSortedProviders
    * @covers ::getProvider
@@ -28,12 +30,12 @@ public function testAuthenticationCollector() {
     $providers = [];
     $global = [];
     $authentication_collector = new AuthenticationCollector();
-    for ($i=0; $i<10; $i++) {
+    for ($i = 0; $i < 10; $i++) {
       $provider_id = $this->randomMachineName();
-      $priority = rand(-100,100);
+      $priority = rand(-100, 100);
       $provider = new TestAuthenticationProvider($provider_id);
       $providers[$priority] = $provider;
-      $global[$provider_id] = rand(0,1) > 0.5;
+      $global[$provider_id] = rand(0, 1) > 0.5;
       $authentication_collector->addProvider($provider, $provider_id, $priority, $global[$provider_id]);
     }
     // Sort the $providers array by priority (highest number is lowest priority)
@@ -50,6 +52,9 @@ public function testAuthenticationCollector() {
 
 }
 
+/**
+ * A simple provider for unit testing AuthenticationCollector.
+ */
 class TestAuthenticationProvider implements AuthenticationProviderInterface {
 
   /**