コンテンツ情報取得の実装をapi.phpから剥がした

tests/Unit/MetadataResolver/OGPResolverTest.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace Tests\Unit\MetadataResolver;
+
+use App\MetadataResolver\OGPResolver;
+use GuzzleHttp\Exception\ClientException;
+use Tests\TestCase;
+
+class OGPResolverTest extends TestCase
+{
+    public function testMissingUrl()
+    {
+        $resolver = new OGPResolver();
+
+        $this->expectException(ClientException::class);
+        $resolver->resolve('http://example.com/404');
+    }
+
+    public function testResolve()
+    {
+        $resolver = new OGPResolver();
+
+        $metadata = $resolver->resolve('http://ogp.me');
+        $this->assertEquals('Open Graph protocol', $metadata->title);
+        $this->assertEquals('The Open Graph protocol enables any web page to become a rich object in a social graph.', $metadata->description);
+        $this->assertEquals('http://ogp.me/logo.png', $metadata->image);
+    }
+}