Add tests for the Item validations.

tests/Feature/ItemTest.php

@@ -0,0 +1,39 @@
+<?php
+
+namespace Tests\Feature;
+
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Illuminate\Foundation\Testing\WithFaker;
+use Tests\TestCase;
+
+use App\Models\Item;
+
+class ItemTest extends TestCase
+{
+    /* Item validation */
+
+    public function test_item_with_empty_name(): void
+    {
+        $json = Item::validate_with_name('');
+
+        $this->assertEquals($json['error'], 'The item name is empty, please, write the name!!!');
+    }
+
+    public function test_not_existing_item_with_name(): void
+    {
+        $name = '404 Item';
+
+        $json = Item::validate_with_name($name);
+
+        $this->assertEquals($json['error'], 'A item with the name does not exist!!!');
+    }
+
+    public function test_valid_item_with_name(): void
+    {
+        $name = 'Pizza Polo';
+
+        $json = Item::validate_with_name($name);
+
+        $this->assertEquals($json['ok'], 'A item with the name is valid.');
+    }
+}