Rename config class used in test cases.

Having a separate classname for testing allows the testsuite to not
provide a classname that the application would. This allows composer to
generate the correct classmap when CakePHP is installed with composer.

Fixes #4112

lib/Cake/Network/Email/CakeEmail.php

@@ -325,6 +325,13 @@ class CakeEmail {
  */
 	protected $_emailPattern = null;
 
+/**
+ * The classname used for email configuration.
+ *
+ * @var string
+ */
+	protected $_configClass = 'EmailConfig';
+
 /**
  * Constructor
  *
@@ -1179,10 +1186,10 @@ public static function deliver($to = null, $subject = null, $message = null, $tr
  */
 	protected function _applyConfig($config) {
 		if (is_string($config)) {
-			if (!class_exists('EmailConfig') && !config('email')) {
+			if (!class_exists($this->_configClass) && !config('email')) {
 				throw new ConfigureException(__d('cake_dev', '%s not found.', APP . 'Config' . DS . 'email.php'));
 			}
-			$configs = new EmailConfig();
+			$configs = new $this->_configClass();
 			if (!isset($configs->{$config})) {
 				throw new ConfigureException(__d('cake_dev', 'Unknown email configuration "%s".', $config));
 			}

lib/Cake/Test/Case/Network/Email/CakeEmailTest.php

@@ -26,6 +26,15 @@
  */
 class TestCakeEmail extends CakeEmail {
 
+/**
+ * Config classname.
+ *
+ * Use a the testing config class in this file.
+ *
+ * @var string
+ */
+	protected $_configClass = 'TestEmailConfig';
+
 /**
  * Config
  *
@@ -79,7 +88,7 @@ public function render($content) {
  * EmailConfig class
  *
  */
-class EmailConfig {
+class TestEmailConfig {
 
 /**
  * test config
@@ -841,7 +850,7 @@ public function testConfig() {
  * @return void
  */
 	public function testConfigString() {
-		$configs = new EmailConfig();
+		$configs = new TestEmailConfig();
 		$this->CakeEmail->config('test');
 
 		$result = $this->CakeEmail->to();
@@ -1767,8 +1776,8 @@ public function testConstructWithConfigArray() {
  * @return void
  */
 	public function testConstructWithConfigString() {
-		$configs = new EmailConfig();
-		$this->CakeEmail = new CakeEmail('test');
+		$configs = new TestEmailConfig();
+		$this->CakeEmail = new TestCakeEmail('test');
 
 		$result = $this->CakeEmail->to();
 		$this->assertEquals($configs->test['to'], $result);