Methods to set/get subject.

lib/Cake/Network/CakeEmail.php

@@ -97,7 +97,7 @@ class CakeEmail {
  *
  * @var string
  */
-	protected $_subject = null;
+	protected $_subject = '';
 
 /**
  * Associative array of a user defined headers
@@ -451,6 +451,25 @@ class CakeEmail {
 		$this->{$varName} = array_merge($this->{$varName}, $list);
 	}
 
+/**
+ * Set Subject
+ *
+ * @param string $subject
+ * @return void
+ */
+	public function setSubject($subject) {
+		$this->_subject = (string)$subject;
+	}
+
+/**
+ * Get Subject
+ *
+ * @return string
+ */
+	public function getSubject() {
+		return $this->_subject;
+	}
+
 /**
  * Sets headers for the message
  *

lib/Cake/tests/Case/Network/CakeEmailTest.php

@@ -102,6 +102,22 @@ class CakeEmailTest extends CakeTestCase {
 		$this->assertIdentical($this->CakeEmail->getTo(), $expected);
 	}
 
+/**
+ * testSubject method
+ *
+ * @return void
+ */
+	public function testSubject() {
+		$this->CakeEmail->setSubject('You have a new message.');
+		$this->assertIdentical($this->CakeEmail->getSubject(), 'You have a new message.');
+
+		$this->CakeEmail->setSubject(1);
+		$this->assertIdentical($this->CakeEmail->getSubject(), '1');
+
+		$this->CakeEmail->setSubject(array('something'));
+		$this->assertIdentical($this->CakeEmail->getSubject(), 'Array');
+	}
+
 /**
  * testHeaders method
  *