Fix kernel booting problem on Aggregator and Filter tests

src/Bundle/ChillCalendarBundle/Tests/Export/Filter/AgentFilterTest.php

@@ -50,8 +50,9 @@ final class AgentFilterTest extends AbstractFilterTest
         return $this->filter;
     }
 
-    public function getFormData(): array
+    public function getFormData(): iterable
     {
+        self::bootKernel();
         $em = self::$container->get(EntityManagerInterface::class);
 
         $array = $em->createQueryBuilder()
@@ -63,26 +64,26 @@ final class AgentFilterTest extends AbstractFilterTest
         $data = [];
 
         foreach ($array as $a) {
-            $data[] = [
+            yield [
                 'accepted_agents' => $a,
             ];
         }
 
-        return $data;
+        self::ensureKernelShutdown();
     }
 
-    public function getQueryBuilders(): array
+    public function getQueryBuilders(): iterable
     {
-        if (null === self::$kernel) {
-            self::bootKernel();
-        }
+        self::bootKernel();
 
         $em = self::$container->get(EntityManagerInterface::class);
 
-        return [
+        yield
             $em->createQueryBuilder()
                 ->select('cal.id')
-                ->from(Calendar::class, 'cal'),
-        ];
+                ->from(Calendar::class, 'cal')
+        ;
+
+        self::ensureKernelShutdown();
     }
 }