Added optional author element to Item. According to spec, this should be an email address, but a full name could also be included.

Tests updated and passing.

Author: marcdenning

Source/Suin/RSSWriter/Item.php

@@ -22,6 +22,8 @@ class Item implements \Suin\RSSWriter\ItemInterface
 	protected $pubDate;
     /** @var array */
     protected $enclosure;
+    /** @var string */
+    protected $author;
 
 	/**
 	 * Set item title
@@ -105,7 +107,17 @@ public function enclosure($url, $length = 0, $type = 'audio/mpeg')
 		return $this;
 	}
 
-	/**
+    /**
+     * Set the author
+     * @param string $author Email of item author
+     * @return $this
+     */
+    public function author($author) {
+        $this->author = $author;
+        return $this;
+    }
+
+    /**
 	 * Append item to the channel
 	 * @param \Suin\RSSWriter\ChannelInterface $channel
 	 * @return $this
@@ -164,6 +176,11 @@ public function asXML()
                 $element->addAttribute('length', $this->enclosure['length']);
             }
 		}
+
+        if ( ! empty($this->author) ) {
+            $xml->addChild('author', $this->author);
+        }
+
 		return $xml;
 	}
 }

Source/Suin/RSSWriter/ItemInterface.php

@@ -60,6 +60,13 @@ public function pubDate($pubDate);
 	 */
 	public function enclosure($url, $length = 0, $type = 'audio/mpeg');
 
+    /**
+     * Set the author
+     * @param string $author Email of item author
+     * @return $this
+     */
+    public function author($author);
+
 	/**
 	 * Append item to the channel
 	 * @param \Suin\RSSWriter\ChannelInterface $channel

Tests/Suin/RSSWriter/ItemTest.php

@@ -97,6 +97,14 @@ public function testEnclosure()
 		$this->assertAttributeSame($enclosure, 'enclosure', $item);
 	}
 
+    public function testAuthor()
+    {
+        $author = uniqid();
+        $item = new Item();
+        $this->assertSame($item, $item->author($author));
+        $this->assertAttributeSame($author, 'author', $item);
+    }
+
 	public function testAsXML()
 	{
 		$now = time();
@@ -116,7 +124,8 @@ public function testAsXML()
             'enclosure' => array(
                 'url'    => 'http://link-to-audio-file.com/test.mp3',
                 'length' => 4992,
-                'type'   => 'audio/mpeg')
+                'type'   => 'audio/mpeg'),
+            'author' => 'Hidehito Nozawa aka Suin'
 		);
 
 		$item = new Item();
@@ -136,6 +145,7 @@ public function testAsXML()
 			<guid isPermaLink=\"true\">{$data['guid']}</guid>
 			<pubDate>{$nowString}</pubDate>
             <enclosure url=\"{$data['enclosure']['url']}\" length=\"{$data['enclosure']['length']}\" type=\"{$data['enclosure']['type']}\"/>
+            <author>{$data['author']}</author>
 		</item>
 		";
 		$this->assertXmlStringEqualsXmlString($expect, $item->asXML()->asXML());