diff --git a/src/cryptobox/tests/test.core.blockdevice.py b/src/cryptobox/tests/test.core.blockdevice.py
index 69c99f1..b0d2ff3 100755
--- a/src/cryptobox/tests/test.core.blockdevice.py
+++ b/src/cryptobox/tests/test.core.blockdevice.py
@@ -48,14 +48,13 @@ class CoreBlockDevice(CommonTestClass):
         """
         get_device = lambda devname: blockdevice.get_blockdevice(devname)
         func = lambda parent, child: get_device(parent).is_parent_of(get_device(child))
-        # TODO: 
-        #func_raw = lambda parent: get_device(parent).is_parent_of
+        func_raw = lambda parent: get_device(parent).is_parent_of
         self.assertTrue(func(self.blockdevice, self.device))
         self.assertFalse(func(self.blockdevice, self.blockdevice))
         self.assertFalse(func(self.device, self.blockdevice))
         self.assertFalse(func(self.device, self.device))
         self.assertFalse(func(self.blockdevice, "/dev/hde1"))
         self.assertFalse(func("ram0", "ram1"))
-        #self.assertFalse(func_raw(self.blockdevice) None))
+        self.assertFalse(func_raw(self.blockdevice)(None))
         self.assertRaises(CBInternalError, func_raw(self.blockdevice), "")