Add CartController, the selectCity method and its test.

app/Http/Controllers/API/v2/CartController.php

@@ -6,6 +6,13 @@ use App\Http\Requests\StoreCartRequest;
 use App\Http\Requests\UpdateCartRequest;
 use App\Http\Resources\API\v2\CartResource;
 use App\Models\Cart;
+use App\Models\User;
+use App\Models\City;
+use Illuminate\Http\Request;
+
+use App\Http\Controllers\Controller;
+use App\Http\Controllers\API\v2\UserController;
+use Illuminate\Auth\Events\Validated;
 
 class CartController extends Controller
 {
@@ -17,6 +24,51 @@ class CartController extends Controller
         //
     }
 
+    public function selectCity(Request $request) {
+        $matrix_username = $request->input('matrix_username') ?? '';
+        $city_name = $request->input('city_name') ?? '';
+
+        // check for not valid user
+        $validation = User::validate_with_matrix_username($matrix_username);
+        if(array_key_exists('error', $validation))
+            return response()->json($validation);
+
+        // check for not valid city
+        $validation = City::validate_with_name($city_name);
+        if(array_key_exists('error', $validation))
+            return response()->json($validation);
+
+        // Get objects
+        $user = User::where('matrix_username', $matrix_username)->first();
+        $city = City::where('name', $city_name)->first();
+
+        $cart = Cart::firstOrCreate(
+            [
+                'user_id' => $user->id,
+                'status' => 'CART'
+            ],
+            [
+                'city_id' => $city->id,
+            ]
+        );
+
+        if($cart->city_id != $city->id) {
+            $cart->setCity($city);
+
+            return response()->json([
+                'ok' => 'City changed successfully',
+                'name' => $city->name,
+                'uuid' => $city->uuid,
+            ]);
+        }
+
+        return response()->json([
+            'ok' => 'City selected successfully',
+            'name' => $city->name,
+            'uuid' => $city->uuid,
+        ]);
+    }
+
     /**
      * Show the form for creating a new resource.
      */

app/Http/Controllers/API/v2/CityController.php

@@ -32,20 +32,6 @@ class CityController extends Controller
         return new CityCollection(City::all());
     }
 
-    public function selectCity(Request $request)
-    {
-        $name = $request->input('name');
-        $uuid = $request->input('uuid');
-
-        // Process the received name and uuid as required
-
-        // Return a response
-        return response()->json([
-            'message' => 'City selected successfully',
-            'name' => $name,
-            'uuid' => $uuid,
-        ]);
-    }
 
     /**
      * Show the form for creating a new resource.

tests/Feature/CartTest.php

@@ -0,0 +1,122 @@
+<?php
+
+namespace Tests\Feature;
+
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Illuminate\Foundation\Testing\WithFaker;
+use Tests\TestCase;
+
+use App\Models\User;
+use App\Models\City;
+use App\Models\Cart;
+
+class CartTest extends TestCase
+{
+    protected $test_user_username = 'Test';
+    protected $test_city_name = 'testCity';
+    protected $test_city_name2 = 'testCity2';
+
+    protected $test_user;
+    protected $test_city;
+
+    public function test_get_data(): void
+    {
+        $this->test_user = User::where('username', $this->test_user_username)->first();
+        $this->test_city = City::where('name', $this->test_city_name)->first();
+
+        $this->assertNotNull($this->test_user);
+        $this->assertNotNull($this->test_city);
+    }
+
+    public function test_select_city_first_time(): void
+    {
+        $this->test_user = User::where('username', $this->test_user_username)->first();
+        $this->test_city = City::where('name', $this->test_city_name)->first();
+
+        $this->assertNotNull($this->test_user);
+        $this->assertNotNull($this->test_city);
+
+        $response = $this->post('/api/v2/select-city', [
+            'matrix_username' => $this->test_user->matrix_username,
+            'city_name' => $this->test_city->name,
+        ]);
+
+        $response->assertStatus(200);
+
+        $response->assertJson([
+            'ok' => 'City selected successfully',
+            'name' => $this->test_city->name,
+            'uuid' => $this->test_city->uuid,
+        ]);
+
+        $this->assertDatabaseHas('carts', [
+            'city_id' => $this->test_city->id,
+            'user_id' => $this->test_user->id,
+            'status' => 'CART',
+        ]);
+    }
+
+    public function test_select_another_city_time(): void
+    {
+        $this->test_user = User::where('username', $this->test_user_username)->first();
+        $this->test_city = City::where('name', $this->test_city_name2)->first();
+
+        $this->assertNotNull($this->test_user);
+        $this->assertNotNull($this->test_city);
+
+        $response = $this->post('/api/v2/select-city', [
+            'matrix_username' => $this->test_user->matrix_username,
+            'city_name' => $this->test_city->name,
+        ]);
+
+        $response->assertStatus(200);
+
+        $response->assertJson([
+            'ok' => 'City changed successfully',
+            'name' => $this->test_city->name,
+            'uuid' => $this->test_city->uuid,
+        ]);
+
+        $this->assertDatabaseHas('carts', [
+            'city_id' => $this->test_city->id,
+            'user_id' => $this->test_user->id,
+            'status' => 'CART',
+        ]);
+    }
+
+    public function test_select_city_with_no_city(): void
+    {
+        $this->test_city = City::where('name', $this->test_city_name2)->first();
+
+        $this->assertNotNull($this->test_city);
+
+        $response = $this->post('/api/v2/select-city', [
+            'matrix_username' => '',
+            'city_name' => $this->test_city->name,
+        ]);
+
+        $response->assertStatus(200);
+
+        $response->assertJson([
+            'error' => 'The username is empty, please, write username!!!'
+        ]);
+    }
+
+    public function test_select_city_with_no_user(): void
+    {
+        $this->test_city = City::where('name', $this->test_city_name2)->first();
+
+        $this->assertNotNull($this->test_city);
+
+        $response = $this->post('/api/v2/select-city', [
+            'matrix_username' => '',
+            'city_name' => $this->test_city->name,
+        ]);
+
+        $response->assertStatus(200);
+
+        $response->assertJson([
+            'error' => 'The username is empty, please, write username!!!'
+        ]);
+    }
+}