Needs unit test

[zchee]

deoplete-jedi become have many users and contributors.
Also, the number of PR has increased.

But the language source(I mean deoplete.nvim sources) test is sometimes difficult.
Use mock? Use real headless nvim? either way, it's little difficult.

Ideally, unit testing is completed in travis ci.
Do you have any idea?

[tweekmonster]

I think we can unit test things like utility functions, cache keys, etc. It'll be difficult to test the server, though.

[blueyed]

I suggest using pytest and tox.