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    def testWaitUntilLockedWithTimeoutLocked(self):        lockf = self.mktemp()        lock = lockfile.FilesystemLock(lockf)        self.failUnless(lock.lock())        clock = Clock()        d = lock.deferUntilLocked(timeout=5, interval=1, clock=clock)        clock.advance(10)        self.assertFailure(d, lockfile.TimeoutError)        return d    def testWaitUntilLockedWithTimeoutUnlocked(self):        def onTimeout(f):            f.trap(lockfile.TimeoutError)            self.fail("Should not have timed out")        lockf = self.mktemp()        lock = lockfile.FilesystemLock(lockf)        self.failUnless(lock.lock())        clock = Clock()        clock.callLater(1, lock.unlock)        d = lock.deferUntilLocked(timeout=10, interval=1, clock=clock)        d.addErrback(onTimeout)        clock.advance(10)        return d