Add missing tests for user API

tests/cases/MicroformatsTest.php

@@ -0,0 +1,24 @@
+<?php
+/** @license MIT
+ * Copyright 2023 J. King
+ * See LICENSE and AUTHORS files for details */
+
+declare(strict_types=1);
+namespace MensBeam\Microformats\TestCase;
+
+use MensBeam\Microformats;
+
+/**
+ * @covers MensBeam\Microformats
+ */
+class MicroformatsTest extends \PHPUnit\Framework\TestCase {
+    public function testSerializeToJson(): void {
+        $exp = '{"items":[{"type":["h-card"],"properties":{}}],"rels":{},"rel-urls":{}}';
+        $act = Microformats::toJson(Microformats::fromString('<div class="vcard"></div>', "", ""));
+        $this->assertSame($exp, $act);
+    }
+
+    public function testParseMissingFile(): void {
+        $this->assertNull(@Microformats::fromFile("THIS FILE DOES NOT EXIST", "", ""));
+    }
+}

tests/cases/StandardTest.php

@@ -7,7 +7,6 @@ declare(strict_types=1);
 namespace MensBeam\Microformats\TestCase;
 
 use MensBeam\Microformats;
-use MensBeam\HTML\DOMParser;
 
 /**
  * @covers MensBeam\Microformats

tests/phpunit.dist.xml

@@ -22,6 +22,7 @@
 <testsuites>
     <testsuite name="Standard">
         <file>cases/StandardTest.php</file>
+        <file>cases/MicroformatsTest.php</file>
     </testsuite>
     <testsuite name="URL">
         <file>cases/Url/UrlTest.php</file>