test: stop OuTreeServiceTest hitting a real LDAP server

it_limits_tree_to_default_user_and_computer_ous only mocked
OrganizationalUnit::query(); attachCounts() then called the real
User/Computer query via countObjectsInOu(), which threw "Can't contact
LDAP server" on any checkout whose .env points LDAP_HOSTS at an
unreachable DC (i.e. every CI run since v1.0.0). Stub countObjectsInOu()
on a partial mock, like the sibling test already does — the test only
asserts tree shape, not counts.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01JKT9p3bfP8RZesExdYCS52

tests/Unit/OuTreeServiceTest.php

@@ -114,7 +114,11 @@ class OuTreeServiceTest extends TestCase
         Mockery::mock('alias:\LdapRecord\Models\ActiveDirectory\OrganizationalUnit')
             ->shouldReceive('query')->twice()->andReturn($query);
 
-        $service = new OuTreeService;
+        // Ten test sprawdza wyłącznie kształt drzewa (ograniczenie do rootów +
+        // zagnieżdżenie), nie liczniki - a countObjectsInOu() odpytałoby realny
+        // LDAP. Podstawiamy 0.
+        $service = Mockery::mock(OuTreeService::class)->makePartial()->shouldAllowMockingProtectedMethods();
+        $service->shouldReceive('countObjectsInOu')->andReturn(0);
 
         $userTree = $service->tree('users');
         $computerTree = $service->tree('computers');