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tests/Feature/LocaleSwitchingTest.php

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+<?php
+
+namespace Tests\Feature;
+
+use Tests\TestCase;
+
+class LocaleSwitchingTest extends TestCase
+{
+    public function test_site_uses_russian_by_default(): void
+    {
+        $response = $this->get('/about');
+
+        $response->assertOk();
+        $response->assertSee('lang="ru"', false);
+        $response->assertSee('pc-lang-switcher-label">Рус<', false);
+    }
+
+    public function test_user_can_switch_site_locale_to_kazakh(): void
+    {
+        $response = $this->from('/about')->post('/locale/kk');
+
+        $response->assertRedirect('/about');
+        $response->assertSessionHas('locale', 'kk');
+
+        $this->withSession(['locale' => 'kk'])
+            ->get('/about')
+            ->assertOk()
+            ->assertSee('lang="kk"', false)
+            ->assertSee('pc-lang-switcher-label">Қаз<', false)
+            ->assertSee('Басты бет');
+    }
+
+    public function test_unsupported_locale_returns_not_found(): void
+    {
+        $this->post('/locale/en')->assertNotFound();
+    }
+}