Add tox support for test and verification

.gitignore

@@ -1,7 +1,7 @@
 .idea
+.tox
 venv/
 __pycache__/*
-venv/
 docs/_build/*
 .coverage
 *.egg-info/

.travis.yml

@@ -5,16 +5,21 @@ os:
 python:
 - '3.7'
 - '3.8'
+- '3.9'
+jobs:
+  include:
+    - python: '3.7'
+      env: PYENV=py37
+    - python: '3.8'
+      env: PYENV=py38
+    - python: '3.9'
+      env: PYENV=py39
 install:
 - pip install --upgrade pip
-- pip install setuptools
+- pip install -r test-requirements.txt
 - pip install --upgrade setuptools
-- pip install coveralls
-- pip install -e .
-- pip list
 script:
-- python setup.py test
-- coverage run --source="crc" setup.py test
+- tox -e$PYENV
 after_success: coveralls
 deploy:
   provider: pypi

appveyor.yml

@@ -6,15 +6,16 @@ environment:
     - python_version: "C:\\Python37-x64"
     - python_version: "C:\\Python38"
     - python_version: "C:\\Python38-x64"
+    - python_version: "C:\\Python39"
+    - python_version: "C:\\Python39-x64"
 
 install:
   - "SET PATH=%python_version%;%python_version%\\Scripts;%PATH%"
-  - "pip install setuptools"
+  - "pip install --upgrade pip"
   - "pip install --upgrade setuptools"
-  - "pip install -e ."
-  - "pip list"
+  - "pip install -r  test-requirements.txt"
 
 test_script:
-  - "python setup.py test"
+  - "tox"
 
 build: off

test-requirements.txt

@@ -0,0 +1,3 @@
+setuptools
+coveralls
+tox

tox.ini

@@ -0,0 +1,10 @@
+[tox]
+envlist = py37, py38, py39
+
+[testenv]
+deps =
+    -rtest-requirements.txt
+
+commands =
+    {envpython} setup.py test
+    coverage run --source="crc" setup.py test