Implemented check for required extensions via ::enabled() for mysql a…

…nd mongodb datasources/adapters

libraries/lithium/data/source/MongoDb.php

@@ -81,6 +81,15 @@ public function __destruct() {
 		}
 	}
 
+	/**
+	 * Check for required PHP extension
+	 *
+	 * @return boolean
+	 */
+	public static function enabled() {
+		return extension_loaded('mongo');
+	}
+
 	/**
 	 * Configures a model class by overriding the default dependencies for `'recordSet'` and
 	 * `'record'` , and sets the primary key to `'_id'`, in keeping with Mongo's conventions.

libraries/lithium/data/source/database/adapter/MySql.php

@@ -65,6 +65,15 @@ public function __construct(array $config = array()) {
 		parent::__construct($config + $defaults);
 	}
 
+	/**
+	 * Check for required PHP extension
+	 *
+	 * @return boolean
+	 */
+	public static function enabled() {
+		return extension_loaded('mysql');
+	}
+
 	/**
 	 * Connects to the database using the options provided to the class constructor.
 	 *

libraries/lithium/tests/cases/data/source/MongoDbTest.php

@@ -9,7 +9,16 @@
 
 namespace lithium\tests\cases\data\source;
 
+use \lithium\data\Connections;
+use \lithium\data\source\MongoDb;
+
 class MongoDbTest extends \lithium\test\Unit {
+
+	public function skip() {
+		$message = 'MongoDb Extension is not loaded';
+		$this->skipIf(!MongoDb::enabled(), $message);
+	}
+
 }
 
 ?>

libraries/lithium/tests/cases/data/source/database/adapter/MySqlTest.php

@@ -25,6 +25,9 @@ class MySqlTest extends \lithium\test\Unit {
 	 * @todo Tie into the Environment class to ensure that the test database is being used.
 	 */
 	public function skip() {
+		$message = 'MySql Extension is not loaded';
+		$this->skipIf(!MySql::enabled(), $message);
+
 		$this->_dbConfig = Connections::get('test', array('config' => true));
 		$hasDb = (isset($this->_dbConfig['adapter']) && $this->_dbConfig['adapter'] == 'MySql');
 		$message = 'Test database is either unavailable, or not using a MySQL adapter';