Test travis with Tox

.travis.yml

@@ -1,19 +1,22 @@
 language: python
 # Existing Python versions
-python:
-  - 3.4
-  - 3.5
-  - 3.6
+# python:
+#   - 3.4
+#   - 3.5
+#   - 3.6
 # Enable 3.7 without globally enabling sudo and dist: xenial for other build jobs
 matrix:
   include:
-    - python: 3.7
+    - env: TOX_ENV=py37-django-21-es6 ES_APT_URL=https://artifacts.elastic.co/packages/6.x/apt
+      python: 3.7
       dist: xenial
       sudo: true
+    - env: TOX_ENV=py36-django-110-es2 ES_APT_URL=https://packages.elastic.co/elasticsearch/2.x/debian
+      python: 3.6
 
 before_install:
   - wget -qO - https://packages.elastic.co/GPG-KEY-elasticsearch | sudo apt-key add -
-  - echo "deb https://packages.elastic.co/elasticsearch/2.x/debian stable main" | sudo tee -a /etc/apt/sources.list.d/elastic.list
+  - echo "deb $ES_APT_URL stable main" | sudo tee -a /etc/apt/sources.list.d/elastic.list
   - sudo apt-get update && sudo apt-get install elasticsearch -y
   - sudo service elasticsearch start
 

requirements-dev.txt

@@ -1,7 +1,7 @@
 -r requirements.txt
 
 coverage==4.0.3
-elasticsearch-dsl==2.2.0
+elasticsearch-dsl==6.3.1
 flake8==2.5.4
 nose==1.3.7
 Sphinx==1.4.1

requirements.txt

@@ -1 +1,2 @@
 ply==3.11
+tox==3.7.0