pyfakefs allows illegal stat

[agroce]

import shutil
import pyfakefs.fake_filesystem
import os

ROOT_PATH = "/Volumes/ramdisk/newtest"

fs = pyfakefs.fake_filesystem.FakeFilesystem()
fs.CreateDirectory('/Volumes')
fs.CreateDirectory('/Volumes/ramdisk')
fs.CreateDirectory('/Volumes/ramdisk/newtest')
os0 = pyfakefs.fake_filesystem.FakeOsModule(fs)
opener0 = pyfakefs.fake_filesystem.FakeFileOpen(fs)

if False:
    os0 = os
    shutil.rmtree(ROOT_PATH)
    os.mkdir(ROOT_PATH)
    opener0 = open

component0 = "alpha" 
path0 = ROOT_PATH 
path0 += os.path.sep + component0 
component0 = "" 
file0 = opener0(path0,'w') 
path0 += os.path.sep + component0 
stat0 = os0.stat(path0) 

Python says:

Traceback (most recent call last):
  File "nlinkbug.py", line 26, in <module>
    stat0 = os0.stat(path0) 
OSError: [Errno 20] Not a directory: '/Volumes/ramdisk/newtest/alpha/'