Some failing builds:
https://travis-ci.org/pypiserver/pypiserver/builds/129511699
https://travis-ci.org/pypiserver/pypiserver/builds/126811063
https://travis-ci.org/pypiserver/pypiserver/builds/128599164
https://travis-ci.org/pypiserver/pypiserver/builds/130325284

Logs show that tests hang on a "Password:" prompt, which occurs during python setup.py upload

setuptools changed password prompt behavior here: pypa/setuptools#555
Change was released in v20.10.0 (about 3 weeks ago, when tests started failing).
https://github.com/pypa/setuptools/blob/master/CHANGES.rst#v20100

see #141 for potential fix