Add extensive controller and model tests

tests/Feature/VersionControllerTest.php

@@ -0,0 +1,16 @@
+<?php
+
+use App\Models\Setting;
+
+it('returns version and build info', function (): void {
+    Setting::updateOrCreate(['key' => 'version'], ['value' => '1.2.3']);
+    Setting::updateOrCreate(['key' => 'build'], ['value' => '42']);
+
+    $response = $this->getJson('/api/version');
+
+    $response->assertOk();
+    $response->assertJsonFragment([
+        'version' => '1.2.3',
+        'build' => 42,
+    ]);
+});