feat: review received form submissions in the admin ui

tests/Model/ApplicationFormSubmissionCallsDtoTest.php

@@ -0,0 +1,62 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Tests\Model;
+
+use App\Entity\ApplicationFormSubmission;
+use App\Model\ApplicationFormSubmissionCallsDto;
+use PHPUnit\Framework\TestCase;
+
+class ApplicationFormSubmissionCallsDtoTest extends TestCase
+{
+    public function testTickingABoxStampsToday(): void
+    {
+        $submission = $this->submission();
+
+        $dto = new ApplicationFormSubmissionCallsDto($submission);
+        $dto->setFirstCallHeld(true)->applyToSubmission();
+
+        $this->assertSame(
+            (new \DateTimeImmutable('today'))->format('Y-m-d'),
+            $submission->getFirstCallHeldAt()?->format('Y-m-d')
+        );
+        $this->assertNull($submission->getSecondCallHeldAt());
+    }
+
+    /**
+     * The reason the DTO exists: saving the form again must not move a call from the day it
+     * happened to today.
+     */
+    public function testAnAlreadyHeldCallKeepsItsDate(): void
+    {
+        $held = new \DateTimeImmutable('2026-09-01');
+        $submission = $this->submission()->setFirstCallHeldAt($held);
+
+        $dto = new ApplicationFormSubmissionCallsDto($submission);
+        $this->assertTrue($dto->isFirstCallHeld());
+
+        $dto->applyToSubmission();
+
+        $this->assertSame($held, $submission->getFirstCallHeldAt());
+    }
+
+    public function testUntickingClearsTheDate(): void
+    {
+        $submission = $this->submission()->setSecondCallHeldAt(new \DateTimeImmutable('2026-09-01'));
+
+        $dto = new ApplicationFormSubmissionCallsDto($submission);
+        $dto->setSecondCallHeld(false)->applyToSubmission();
+
+        $this->assertNull($submission->getSecondCallHeldAt());
+    }
+
+    private function submission(): ApplicationFormSubmission
+    {
+        return new ApplicationFormSubmission(
+            'applicationform',
+            'Bewerbungsformular',
+            new \DateTimeImmutable('2026-09-22T12:30:00+02:00')
+        );
+    }
+}