let tox test multiple salt versions, both cherrypy and tornado backends

.travis.yml

@@ -12,23 +12,29 @@ before_install:
 install:
 - pip install tox
 
-matrix:
-  include:
-  - env: TOXENV=27,coverage CODECOV=py
-    python: 2.7
-  - env: TOXENV=34,coverage CODECOV=py
-    python: 3.4
-  - env: TOXENV=35,coverage CODECOV=py
-    python: 3.5
-  - env: TOXENV=36,coverage CODECOV=py
-    python: 3.6
-  - env: TOXENV=37,coverage CODECOV=py
-    python: 3.7-dev
-  - env: TOXENV=flake8
-    python: 3.6
+env:
+  - PY=py27
+  - PY=py34
+  - PY=py35
+  - PY=py36
+  - PY=py37
+  - SALT=v2017.7.9
+  - SALT=v2018.8.4
+  - SALT=v2019.2.0
+  - BACKEND=cherrypy
+  - BACKEND=tornado
 
 script:
-- docker run -v $PWD:/pepper -ti --rm gtmanfred/pepper:latest tox -c /pepper/tox.ini -e "${CODECOV}${TOXENV}"
+  - docker run -v $PWD:/pepper -ti --rm gtmanfred/pepper:latest tox -c /pepper/tox.ini -e "${PY}-${BACKEND}-${SALT}"
+
+jobs:
+  include:
+    - stage: test
+      python: 2.7
+      script: docker run -v $PWD:/pepper -ti --rm gtmanfred/pepper:latest tox -c /pepper/tox.ini -e flake8
+    - stage: test
+      python: 2.7
+      script: docker run -v $PWD:/pepper -ti --rm gtmanfred/pepper:latest tox -c /pepper/tox.ini -e coverage
 
 after_success:
 - sudo chown $USER .tox/

tests/requirements.txt

@@ -4,6 +4,5 @@ pytest-rerunfailures
 pytest-cov
 git+https://github.com/saltstack/pytest-salt@master#egg=pytest-salt
 tornado<5.0.0
-salt
 CherryPy
 setuptools_scm

tox.ini

@@ -1,16 +1,21 @@
 [tox]
-envlist = py{27,34,35,36}-rest_{cherrypy,tornado},coverage,flake8
+envlist = py{27,34,35,36}-{cherrypy,tornado}-{v2017.7.9,v2018.3.4,v2019.2.0},coverage,flake8
 skip_missing_interpreters = true
 skipsdist = false
 
 [testenv]
 passenv = TOXENV CI TRAVIS TRAVIS_* CODECOV_*
 deps = -r{toxinidir}/tests/requirements.txt
+    v2017.7.9: salt==2017.7.9
+    v2018.3.4: salt==2018.3.4
+    v2019.2.0: salt==2019.2.0
+    develop: git+https://github.com/saltstack/salt.git@develop#egg=salt
+
 changedir = {toxinidir}
 setenv = COVERAGE_FILE = {toxworkdir}/.coverage.{envname}
 commands =
-  rest_cherrypy: pytest --cov=pepper/ --cov-config=tox.ini --cov-report= {posargs} --salt-api-backend=rest_cherrypy
-  rest_tornado: pytest --cov=pepper/ --cov-config=tox.ini --cov-report= {posargs} --salt-api-backend=rest_tornado
+    cherrypy: pytest --cov=pepper/ --cov-config=tox.ini --cov-report= {posargs} --salt-api-backend=rest_cherrypy
+    tornado: pytest --cov=pepper/ --cov-config=tox.ini --cov-report= {posargs} --salt-api-backend=rest_tornado
 
 [testenv:flake8]
 basepython = python3