diff --git a/core/tests/Drupal/Tests/Core/Authentication/AuthenticationCollectorTest.php b/core/tests/Drupal/Tests/Core/Authentication/AuthenticationCollectorTest.php
index 48e9938..bfc8d51 100644
--- a/core/tests/Drupal/Tests/Core/Authentication/AuthenticationCollectorTest.php
+++ b/core/tests/Drupal/Tests/Core/Authentication/AuthenticationCollectorTest.php
@@ -30,22 +30,28 @@ public function testAuthenticationCollector() {
     $providers = [];
     $global = [];
     $authentication_collector = new AuthenticationCollector();
-    $priorities = [2, 0, -8, 10, 1, 3, -5, 6, -10, -4];
+    $priorities = [2, 0, -8, 10, 1, 3, -5, 0, 6, -10, -4];
     foreach ($priorities as $priority) {
       $provider_id = $this->randomMachineName();
       $provider = new TestAuthenticationProvider($provider_id);
-      $providers[] = $provider;
+      $providers[$priority][$provider_id] = $provider;
       $global[$provider_id] = rand(0, 1) > 0.5;
       $authentication_collector->addProvider($provider, $provider_id, $priority, $global[$provider_id]);
     }
     // Sort the $providers array by priority (highest number is lowest priority)
     // and compare with AuthenticationCollector::getSortedProviders().
-    array_multisort($priorities, SORT_DESC, $providers);
-    $this->assertEquals($providers, array_values($authentication_collector->getSortedProviders()));
+    krsort($providers);
+
+    // Merge nested providers from $providers into $sorted_providers.
+    $sorted_providers = [];
+    foreach ($providers as $providers_priority) {
+      $sorted_providers = array_merge($sorted_providers, $providers_priority);
+    }
+    $this->assertEquals($sorted_providers, $authentication_collector->getSortedProviders());
 
     // Test AuthenticationCollector::getProvider() and
     // AuthenticationCollector::isGlobal().
-    foreach ($providers as $provider) {
+    foreach ($sorted_providers as $provider) {
       $this->assertEquals($provider, $authentication_collector->getProvider($provider->providerId));
       $this->assertEquals($global[$provider->providerId], $authentication_collector->isGlobal($provider->providerId));
     }