- DOI implementation wit unit testing

app/Providers/DoiServiceProvider.php

@@ -0,0 +1,44 @@
+<?php
+/**
+ * Visual Studio Code.
+ * User: kaiarn
+ * Date: 19.02.21
+ */
+
+namespace App\Providers;
+
+use App\Tethys\Utils\DoiService;
+use Illuminate\Support\ServiceProvider;
+
+class DoiServiceProvider extends ServiceProvider
+{
+    protected $defer = true;
+
+    /**
+     * Bootstrap the application services.
+     *
+     * @return void
+     */
+    public function boot()
+    {
+        //
+    }
+
+    /**
+     * Register the application services.
+     *
+     * @return void
+     */
+    public function register()
+    {
+        //
+        $this->app->singleton('App\Interfaces\DoiInterface', function ($app) {
+            return new DoiService();
+        });
+    }
+
+    public function provides()
+    {
+        return [DoiService::class];
+    }
+}