Preface

What's the tox?  Here, we give the official link: 

https://tox.readthedocs.io/en/latest/

Context

Preconditions: Python and Pytest have been installed on machine .

1.Install tox

pip install -i http://pypi.mirrors.ustc.edu.cn/simple/ tox --trusted-host pypi.mirrors.ustc.edu.cn

2.Create one directory and  some  sub-directory with source file , test file as follow:

directory organization

3. Files contents:

1)requirements.txt

pytest==3.0.0

mock==2.0.0

coverage==4.1

pytest-cov==2.0

pytest-randomly==1.0.0

pytest-mock==1.2

2)src/app.py

from math import fabs,ceil

def math_fabs(x):

    return fabs(x)

def math_ceil(x):

    return ceil(x)

if __name__ == '__main__':

    print(math_fabs(-1.2))

    print(math_ceil(-2.3))

3)tests/test_app.py

import pytest

from src.app import math_ceil,math_fabs

def test_math_fabs():

    assert math_fabs(-1.2) == 1.2

    assert math_fabs(0) == 0

    assert math_fabs(2.4) == 2.4

4) tox.ini

[tox]

envlist = py38

skipsdist = True

indexserver =

    default = http://pypi.mirrors.ustc.edu.cn/simple

[testenv]

install_command = pip install -i http://pypi.mirrors.ustc.edu.cn/simple/ tox --trusted-host pypi.mirrors.ustc.edu.cn {opts} {packages}

deps =

    -rrequirements.txt

commands = coverage erase

          py.test --cov={toxinidir}/src -sx tests

          coverage html

setenv =

    PYTHONPATH = {toxinidir}/py38

[testenv:dev]

deps = pytest

commands = {posargs:py.test}

5)   src/__init__.py  and tests/__init__.py  are both left empty

4. After all files are finished, then run tox in tree directry. 

console output

5. we can check the directory again, maybe some new folders are created.

htmlcov are created for web browser