Allow extension to "vouch" for raw HTML they produce

Rename "unsafeHtml" to "rawHtml"

test/ParsedownTest.php

@@ -1,5 +1,5 @@
 <?php
-require 'UnsafeExtension.php';
+require 'SampleExtensions.php';
 
 use PHPUnit\Framework\TestCase;
 
@@ -56,7 +56,7 @@ class ParsedownTest extends TestCase
         $this->assertEquals($expectedMarkup, $actualMarkup);
     }
 
-    function testUnsafeHtml()
+    function testRawHtml()
     {
         $markdown = "```php\nfoobar\n```";
         $expectedMarkup = '<pre><code class="language-php"><p>foobar</p></code></pre>';
@@ -73,6 +73,23 @@ class ParsedownTest extends TestCase
         $this->assertEquals($expectedSafeMarkup, $actualSafeMarkup);
     }
 
+    function testTrustDelegatedRawHtml()
+    {
+        $markdown = "```php\nfoobar\n```";
+        $expectedMarkup = '<pre><code class="language-php"><p>foobar</p></code></pre>';
+        $expectedSafeMarkup = $expectedMarkup;
+
+        $unsafeExtension = new TrustDelegatedExtension;
+        $actualMarkup = $unsafeExtension->text($markdown);
+
+        $this->assertEquals($expectedMarkup, $actualMarkup);
+
+        $unsafeExtension->setSafeMode(true);
+        $actualSafeMarkup = $unsafeExtension->text($markdown);
+
+        $this->assertEquals($expectedSafeMarkup, $actualSafeMarkup);
+    }
+
     function data()
     {
         $data = array();