Update test and verification setup

.gitignore

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

.travis.yml

@@ -1,20 +1,19 @@
 language:
-- python
-os:
-- linux
-python:
-- '3.7'
-- '3.8'
+  - python
+jobs:
+  include:
+    - python: '3.7'
+      env: PYENV=py37
+      os: linux
+    - python: '3.8'
+      env: PYENV=py38
+      os: linux
 install:
-- pip install --upgrade pip
-- pip install setuptools
-- pip install --upgrade setuptools
-- pip install coveralls
-- pip install -e .
-- pip list
+  - pip install --upgrade pip
+  - pip install -r test-requirements.txt
+  - pip install --upgrade setuptools
 script:
-- python setup.py test
-- coverage run --source="crc" setup.py test
+  - tox -e $PYENV
 after_success: coveralls
 deploy:
   provider: pypi

appveyor.yml

@@ -2,19 +2,13 @@ os: Windows Server 2012
 
 environment:
   matrix:
-    - python_version: "C:\\Python37"
-    - python_version: "C:\\Python37-x64"
-    - python_version: "C:\\Python38"
-    - python_version: "C:\\Python38-x64"
+    - TOXENV: py37
+    - TOXENV: py38
 
 install:
-  - "SET PATH=%python_version%;%python_version%\\Scripts;%PATH%"
-  - "pip install setuptools"
-  - "pip install --upgrade setuptools"
-  - "pip install -e ."
-  - "pip list"
+  - C:\Python37\python -m pip install -U -r test-requirements.txt
 
 test_script:
-  - "python setup.py test"
+  - C:\Python37\scripts\tox
 
 build: off

setup.py

@@ -26,6 +26,7 @@ def readme():
         ],
         url='https://github.com/Nicoretti/crc',
         license='BSD',
+        python_requires='>=3.7',
         author='Nicola Coretti',
         author_email='nico.coretti@gmail.com',
         description='Library and CLI to calculate and verify all kinds of CRC checksums.',

test-requirements.txt

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

tox.ini

@@ -0,0 +1,10 @@
+[tox]
+envlist = py{37, 38, 39}
+
+[testenv]
+deps =
+    -rtest-requirements.txt
+
+commands =
+    {envpython} setup.py test
+    coverage run --source="crc" setup.py test