added test extension

tests/DependencyInjection/VelhronDadataExtensionTest.php

@@ -0,0 +1,27 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Velhron\DadataBundle\Tests\DependencyInjection;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\Yaml\Yaml;
+use Velhron\DadataBundle\DependencyInjection\VelhronDadataExtension;
+
+class VelhronDadataExtensionTest extends TestCase
+{
+    public function testRegister(): void
+    {
+        $config = Yaml::parse(file_get_contents(__DIR__.'/config.yaml'));
+
+        $containerBuilder = new ContainerBuilder();
+        $containerBuilder->setParameter('kernel.debug', true);
+
+        $extension = new VelhronDadataExtension();
+        $extension->load($config, $containerBuilder);
+
+        $this->assertSame('token', $containerBuilder->getParameter('velhron_dadata.token'));
+        $this->assertSame('secret', $containerBuilder->getParameter('velhron_dadata.secret'));
+    }
+}