diff --git a/Tests/csrfTest.php b/Tests/csrfTest.php
index 5166e07..e7bb23c 100644
--- a/Tests/csrfTest.php
+++ b/Tests/csrfTest.php
@@ -11,6 +11,7 @@ class test_csrf extends PHPUnit_Framework_TestCase
   {
     $csrf = new csrf ();
     $res = $csrf->createToken ();
+    $GLOBALS["CSRFTEST-Token"] = $res;
     $this->assertSame (30, strlen ($res));
   }
 
@@ -60,4 +61,30 @@ class test_csrf extends PHPUnit_Framework_TestCase
     $res = $csrf->getToken ();
     $this->assertSame (30, strlen ($res));
   }
+
+  public function test_csrf_multiple_1 ()
+  {
+    $csrf1 = new csrf ();
+    $token1 = $csrf1->createToken ();
+    $csrf2 = new csrf ();
+    $token2 = $csrf2->createToken ();
+    $this->assertSame (true,
+      $csrf2->checkToken ($token1) && $csrf2->checkToken ($token2));
+  }
+
+  public function test_csrf_multiple_extend_2 ()
+  {
+    $csrf = new csrf ();
+    $res = $csrf->extendToken ($GLOBALS["CSRFTEST-Token"]);
+    $this->assertSame (true, $res);
+  }
+
+  public function test_csrf_multiple_get ()
+  {
+    $csrf1 = new csrf ();
+    $token1 = $csrf1->createToken ();
+    $csrf2 = new csrf ();
+    $token2 = $csrf2->getToken ();
+    $this->assertSame ($token1, $token2);
+  }
 }