fixed language switching in the frontend

tests/Feature/Marketing/MarketingLocaleRoutingTest.php

@@ -0,0 +1,58 @@
+<?php
+
+namespace Tests\Feature\Marketing;
+
+use Inertia\Testing\AssertableInertia as Assert;
+use Tests\TestCase;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+
+class MarketingLocaleRoutingTest extends TestCase
+{
+    use RefreshDatabase;
+    public function test_home_route_accepts_german_locale_prefix(): void
+    {
+        $response = $this->get('/de');
+
+        $response->assertOk();
+        $response->assertInertia(fn (Assert $page) => $page
+            ->component('marketing/Home')
+            ->where('locale', 'de')
+            ->where('supportedLocales.0', 'de')
+        );
+    }
+
+    public function test_home_route_accepts_english_locale_prefix(): void
+    {
+        $response = $this->get('/en');
+
+        $response->assertOk();
+        $response->assertInertia(fn (Assert $page) => $page
+            ->component('marketing/Home')
+            ->where('locale', 'en')
+            ->where('supportedLocales.1', 'en')
+        );
+    }
+
+    public function test_contact_route_respects_locale_and_component(): void
+    {
+        $response = $this->get('/en/contact');
+
+        // Debug response headers for redirect source during development
+        // @phpstan-ignore-next-line
+        // var_dump($response->headers->all());
+
+        $response->assertOk();
+        $response->assertInertia(fn (Assert $page) => $page
+            ->component('marketing/Kontakt')
+            ->where('locale', 'en')
+        );
+
+        $responseDe = $this->get('/de/kontakt');
+
+        $responseDe->assertOk();
+        $responseDe->assertInertia(fn (Assert $page) => $page
+            ->component('marketing/Kontakt')
+            ->where('locale', 'de')
+        );
+    }
+}