Adapt tests with displayName array

Author: MatthieuLeboeuf

tests/Auth/LdapTest.php

@@ -29,7 +29,7 @@ protected function setUp(): void
             'auth.defaults.guard'                  => 'ldap',
             'services.ldap.base_dn'                => 'dc=ldap,dc=local',
             'services.ldap.email_attribute'        => 'mail',
-            'services.ldap.display_name_attribute' => 'cn',
+            'services.ldap.display_name_attribute' => ['cn'],
             'services.ldap.id_attribute'           => 'uid',
             'services.ldap.user_to_groups'         => false,
             'services.ldap.version'                => '3',
@@ -581,7 +581,7 @@ public function test_login_group_mapping_does_not_conflict_with_default_role()
     public function test_login_uses_specified_display_name_attribute()
     {
         app('config')->set([
-            'services.ldap.display_name_attribute' => 'displayName',
+            'services.ldap.display_name_attribute' => ['displayName'],
         ]);
 
         $this->commonLdapMocks(1, 1, 2, 4, 2);
@@ -606,7 +606,7 @@ public function test_login_uses_specified_display_name_attribute()
     public function test_login_uses_default_display_name_attribute_if_specified_not_present()
     {
         app('config')->set([
-            'services.ldap.display_name_attribute' => 'displayName',
+            'services.ldap.display_name_attribute' => ['displayName'],
         ]);
 
         $this->commonLdapMocks(1, 1, 2, 4, 2);