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

src/Form/Model/Configuration.php

@@ -156,8 +156,10 @@ final class Configuration
         return $this->formTheme;
     }
 
-    public function setFormTheme(string $formTheme): void
+    public function setFormTheme(string $formTheme): Configuration
     {
         $this->formTheme = $formTheme;
+
+        return $this;
     }
 }

src/Form/Model/MultiUserTimesheet.php

@@ -51,7 +51,7 @@ final class MultiUserTimesheet extends Timesheet
     public function removeUser(User $user): void
     {
         if ($this->users->contains($user)) {
-            $this->users->remove($user);
+            $this->users->removeElement($user);
         }
     }
 
@@ -71,7 +71,7 @@ final class MultiUserTimesheet extends Timesheet
     public function removeTeam(Team $team): void
     {
         if ($this->teams->contains($team)) {
-            $this->teams->remove($team);
+            $this->teams->removeElement($team);
         }
     }
 }

src/Form/Model/TotpActivation.php

@@ -15,7 +15,7 @@ final class TotpActivation
 {
     private ?string $code = null;
 
-    public function __construct(private User $user)
+    public function __construct(private readonly User $user)
     {
     }