>> I'm not sure it is necessary to use TempdirManager here to write tests
>> for MANIFEST reading.

>Well, the sdist command has to run on some directory where some files >exist, right?  So it’s better to do it in a temp dir that will automatically get >cleaned up.

Because the MANIFEST file finally will be filled with file-paths which takes '/' as path separator and that's what we can make sure if we already hacked the write_manifest function in sdist.py, so we can just write the imitated paths strings  into the MANIFEST file , not needing to really create these files at first. As a test, it makes sense. So, I think we maynot need to use TempdirManager here.

>> Bad effect is MANIFEST file will be re-written:

>You should read the docs for MANIFEST and sdist: a MANIFEST without >the magic comment will not get overwritten (unless there’s a bug :)

Oh, you are right. Thus this bad effect would not exist for this test. But future discussing is still needed.