Session driver-independent way to make sessions unique.

src/Behat/Mink/Session.php

@@ -24,6 +24,7 @@ class Session
     private $driver;
     private $page;
     private $selectorsHandler;
+    private $uniqueId;
 
     /**
      * Initializes session.
@@ -42,6 +43,7 @@ public function __construct(DriverInterface $driver, SelectorsHandler $selectors
         $this->driver           = $driver;
         $this->page             = new DocumentElement($this);
         $this->selectorsHandler = $selectorsHandler;
+        $this->uniqueId         = uniqid('mink_session_');
     }
 
     /**
@@ -97,6 +99,17 @@ public function getDriver()
         return $this->driver;
     }
 
+    /**
+     * Returns session unique id.
+     *
+     * @return string
+     * @access public
+     */
+    public function getUniqueId()
+    {
+        return $this->uniqueId;
+    }
+
     /**
      * Returns page element.
      *
@@ -205,7 +218,7 @@ public function getCurrentUrl()
     /**
      * Capture a screenshot of the current window.
      *
-     * @return  string  screenshot of MIME type image/* depending 
+     * @return  string  screenshot of MIME type image/* depending
      *   on driver (e.g., image/png, image/jpeg)
      */
     public function getScreenshot()

tests/Behat/Mink/SessionTest.php

@@ -11,6 +11,13 @@ class SessionTest extends \PHPUnit_Framework_TestCase
 {
     private $driver;
     private $selectorsHandler;
+
+    /**
+     * Session.
+     *
+     * @var Session
+     * @access private
+     */
     private $session;
 
     protected function setUp()
@@ -114,4 +121,18 @@ public function testWait()
 
         $this->session->wait(1000, 'function() {}');
     }
+
+    /**
+     * Testing that 2 sessions created with same parameters have different IDs.
+     *
+     * @return void
+     * @access public
+     */
+    public function testUniqueId()
+    {
+        $session  = new Session($this->driver, $this->selectorsHandler);
+
+        $this->assertNotEquals($session->getUniqueId(), $this->session->getUniqueId());
+
+    }
 }