[Tests] Coverage and extension checking

tests/Ratchet/Tests/AbstractConnectionDecoratorTest.php

@@ -5,6 +5,7 @@ use Ratchet\Tests\Mock\Connection;
 
 /**
  * @covers Ratchet\AbstractConnectionDecorator
+ * @covers Ratchet\ConnectionInterface
  */
 class AbstractConnectionDecoratorTest extends \PHPUnit_Framework_TestCase {
     protected $mock;

tests/Ratchet/Tests/Session/SessionComponentTest.php

@@ -43,6 +43,10 @@ class SessionProviderTest extends \PHPUnit_Framework_TestCase {
      * I think I have severly butchered this test...it's not so much of a unit test as it is a full-fledged component test
      */
     public function testConnectionValueFromPdo() {
+        if (!extension_loaded('PDO')) {
+            return $this->markTestSkipped();
+        }
+
         $sessionId = md5('testSession');
 
         $dbOptions = array(

tests/Ratchet/Tests/WebSocket/WsServerTest.php

@@ -5,6 +5,8 @@ use Ratchet\Tests\Mock\Component as MockComponent;
 
 /**
  * @covers Ratchet\WebSocket\WsServer
+ * @covers Ratchet\ComponentInterface
+ * @covers Ratchet\MessageComponentInterface
  */
 class WsServerTest extends \PHPUnit_Framework_TestCase {
     protected $comp;