test: add some KernelTestCase

tests/Entity/InstanceTest.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace App\Tests\Entity;
+
+use ApiPlatform\Symfony\Bundle\Test\ApiTestCase;
+use App\Entity\Instance;
+use Symfony\Contracts\HttpClient\Exception\TransportExceptionInterface;
+use Zenstruck\Foundry\Test\Factories;
+
+final class InstanceTest extends ApiTestCase
+{
+    use Factories;
+
+    /**
+     * @throws TransportExceptionInterface
+     */
+    public function testInstance(): void
+    {
+        $client = InstanceTest::createClient();
+        $client->request('GET', '/api/config');
+        $this->assertResponseIsSuccessful();
+        $this->assertMatchesResourceItemJsonSchema(Instance::class);
+    }
+}