Some random tests and fixes (#6000)

* added tests for form models
* apply form theme only to the own custom form type
* change route order for improves matching

tests/Form/Model/TotpActivationTest.php

@@ -0,0 +1,34 @@
+<?php
+
+/*
+ * This file is part of the Kimai time-tracking app.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Tests\Form\Model;
+
+use App\Entity\User;
+use App\Form\Model\TotpActivation;
+use PHPUnit\Framework\Attributes\CoversClass;
+use PHPUnit\Framework\TestCase;
+
+#[CoversClass(TotpActivation::class)]
+class TotpActivationTest extends TestCase
+{
+    public function testDefaultValues(): void
+    {
+        $user = new User();
+        $sut = new TotpActivation($user);
+
+        self::assertSame($user, $sut->getUser());
+        self::assertNull($sut->getCode());
+        $sut->setCode('');
+        self::assertEquals('', $sut->getCode());
+        $sut->setCode('jztfztfjzfjhgfjhgfjhgfjtzfiuzgbljv');
+        self::assertEquals('jztfztfjzfjhgfjhgfjhgfjtzfiuzgbljv', $sut->getCode());
+        $sut->setCode(null);
+        self::assertNull($sut->getCode());
+    }
+}