Add a tox file to automatically run the tests and add Python 3.9

Author: Jon Betts

.python-version

@@ -0,0 +1,8 @@
+3.9.2
+3.8.8
+3.7.10
+3.6.13
+3.5.10
+2.7.18
+pypy-5.7.1
+pypy3.7-7.3.3

.travis.yml

@@ -7,14 +7,16 @@ python:
   - "3.6"
   - "3.7"
   - "3.8"
+  - "3.9"
   - "pypy"
   - "pypy3"
 
 install:
   - pip install pip -U
   - pip install -e .
   - pip install pycodestyle
-  - pip install coveralls
+  # Avoid cryptography compilation problems with pypy and 2.7
+  - pip install coveralls 'cryptography<=3.0;python_version=="2.7"'
   - pip install https://github.com/un33k/pyflakes/tarball/master
 
 before_script:

README.md

@@ -166,6 +166,10 @@ quick-brown-fox-jumps-over-lazy-dog
 Running the tests
 ====================
 
+To run the tests against all environments:
+
+    tox
+
 To run the tests against the current environment:
 
     python test.py

setup.py

@@ -30,6 +30,8 @@
     'Programming Language :: Python :: 3.5',
     'Programming Language :: Python :: 3.6',
     'Programming Language :: Python :: 3.7',
+    'Programming Language :: Python :: 3.8',
+    'Programming Language :: Python :: 3.9',
 ]
 
 

tox.ini

@@ -0,0 +1,18 @@
+[tox]
+envlist = py{39,38,37,36,35,27},pypy,pypy3
+
+[testenv]
+deps=
+    -e .
+commands =
+    python -m unittest test
+
+[testenv:format]
+deps = pycodestyle
+allowlist_externals = sh
+commands = sh format.sh
+
+[testenv:coverage]
+deps = coverage
+commands =
+    coverage run --source=slugify test.py