diff --git a/app/Containers/VikonIntegration/Tests/Feature/UpdatePartTest.php b/app/Containers/VikonIntegration/Tests/Feature/UpdatePartTest.php
new file mode 100644
index 0000000..9ed1913
--- /dev/null
+++ b/app/Containers/VikonIntegration/Tests/Feature/UpdatePartTest.php
@@ -0,0 +1,60 @@
+<?php
+
+namespace App\Containers\VikonIntegration\Tests\Feature;
+
+use App\Containers\User\Models\User;
+use App\Ship\Tests\TestCase;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+
+class UpdatePartTest extends TestCase
+{
+    use RefreshDatabase;
+
+    private function createUser(): User
+    {
+        return User::withoutEvents(fn () => User::create([
+            'name' => 'Test User',
+            'slug' => 'test-user',
+            'email' => 'test-user-' . uniqid() . '@example.com',
+            'password' => bcrypt('password'),
+        ]));
+    }
+
+    public function test_update_part_requires_authentication(): void
+    {
+        $response = $this->postJson('/dashboard/vikon-updates/update-part', [
+            'module_id' => 1,
+            'part' => 'common',
+        ]);
+
+        $response->assertStatus(401);
+    }
+
+    public function test_update_part_validates_module_id(): void
+    {
+        $user = $this->createUser();
+        $this->actingAs($user);
+
+        $response = $this->postJson('/dashboard/vikon-updates/update-part', [
+            'module_id' => 999,
+            'part' => 'common',
+        ]);
+
+        $response->assertStatus(422);
+        $response->assertJsonValidationErrors('module_id');
+    }
+
+    public function test_update_part_validates_part(): void
+    {
+        $user = $this->createUser();
+        $this->actingAs($user);
+
+        $response = $this->postJson('/dashboard/vikon-updates/update-part', [
+            'module_id' => 1,
+            'part' => '',
+        ]);
+
+        $response->assertStatus(422);
+        $response->assertJsonValidationErrors('part');
+    }
+}