Proof of concept of tox integration

[lunkwill42]

This sets up a default config for tox, with an environment list for Python versions 3.7 through 3.9, and moves the pytest config into tox.ini while we're at it.

I can now run the test suite (minus equipment tests, in my case) on three versions of Python by just running this:

tox -- -m 'not equipment'

If I want to run on just Python 3.7, like before, I do

tox -e py37 -- -m 'not equipment'

[codecov]

Codecov Report

Base: 64.66% // Head: 64.66% // No change to project coverage 👍

Coverage data is based on head (ed933b7) compared to base (f8f7789).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #282   +/-   ##
========================================
  Coverage    64.66%   64.66%           
========================================
  Files           65       65           
  Lines         6800     6800           
========================================
  Hits          4397     4397           
  Misses        2403     2403           

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[indy-independence]

Looks like a good start

[indy-independence]

I needed to do this to get it working with my pyenv setup:

python3 -m pip install "tox<4" tox-pyenv
pyenv shims
tox -e py37 -- -m 'not equipment'

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

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1.0% Duplication