Introduce tox, add more tests & fix bugs

[boris-42]

• Change structure of the repo where all tests are moved under tests/* directory
  -- All functional tests (one that exists now) are under tests/functional/*
  -- Unit tests are added under tests/unit

• Fix most of code style issues, according to the (PEP8)

• Introduce tox as helper that helps to unify testing experience (this is very very popular tool in python community, downloaded 1M+/month)

• Introduce 4 tox commands:

  • tox -e py3 to run unittests
  • tox -e pep8 to run code style checks
  • tox -e cover to run unittests with coverage
  • tox -e func to run existing functional tests

• Cover with functional tests Node, Edges, Paths

• Fix found bugs

• Removed assserts

If this is accepted next steps are planned:

• To cover rest of functionality with unittests
• Improve a bit code styles by reangling some of style checks
• Refactoring circle CI config to use tox

Note: check commit by commit for simplicity they are separated logical steps

[boris-42]

@gkorland @swilly22 Okay guys before moving with refactoring I think it's good idea to cover everything with unittests, can you please take a look at this PR what do you think?

[swilly22]

Hi @boris-42, we really appricate all of your help! I'll review this PR carefully tomorrow morning. thank you!

[swilly22]

@boris-42 CI currently fails at:

run tests
0s
#!/bin/bash -eo pipefail
. venv/bin/activate
coverage run tests/functional/test_all.py
Traceback (most recent call last):
  File "tests/functional/test_all.py", line 2, in <module>
    from tests.utils import base
ModuleNotFoundError: No module named 'tests'

Exited with code exit status 1
CircleCI received exit code 1

Care to dig into this?

[boris-42]

@swilly22 Will do it today