Include a 'pre' env to test pre-releases

Author: nicoddemus

.github/workflows/main.yml

@@ -10,7 +10,28 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python: ["2.7", "3.5", "3.6", "3.7", "3.8"]
+        tox_env: [
+          "py27",
+          "py35",
+          "py36",
+          "py37",
+          "py38",
+          "pre",
+        ]
+
+        include:
+          - tox_env: "py27"
+            python: "2.7"
+          - tox_env: "py35"
+            python: "3.5"
+          - tox_env: "py36"
+            python: "3.6"
+          - tox_env: "py37"
+            python: "3.7"
+          - tox_env: "py38"
+            python: "3.8"
+          - tox_env: "pre"
+            python: "3.7"
 
     steps:
     - uses: actions/checkout@v1
@@ -24,7 +45,7 @@ jobs:
         pip install tox
     - name: Test
       run: |
-        tox -e py
+        tox -e ${{ matrix.tox_env }}
   
   deploy:
 

tox.ini

@@ -8,6 +8,7 @@ norecursedirs = .git .tox env coverage docs
 pep8ignore =
     docs/conf.py ALL
 pep8maxlinelength = 119
+junit_family=xunit2
 
 
 [testenv]
@@ -28,6 +29,11 @@ commands =
         -ra \
         {posargs:tests}
 
+[testenv:pre]
+pip_pre=true
+usedevelop = {[testenv]usedevelop}
+deps = {[testenv]deps}
+commands = {[testenv]commands}
 
 [testenv:docs]
 changedir = docs