TESTS: rewrite tests using pytest and docker-compose

Experimentation to see if it is worth the effort

.travis.yml

@@ -6,6 +6,7 @@ services:
 env:
     global:
         - DOCKER_VERSION=1.12.3-0~trusty
+        - DOCKER_COMPOSE_VERSION=1.9.0
 
 before_install:
   # list docker-engine versions
@@ -14,15 +15,28 @@ before_install:
   - sudo apt-get -o Dpkg::Options::="--force-confnew" install -y --force-yes docker-engine=${DOCKER_VERSION}
   - docker version
   - docker info
+  # install docker-compose
+  - sudo rm /usr/local/bin/docker-compose ||true
+  - curl -L https://github.com/docker/compose/releases/download/${DOCKER_COMPOSE_VERSION}/docker-compose-`uname -s`-`uname -m` > docker-compose
+  - chmod +x docker-compose
+  - sudo mv docker-compose /usr/local/bin/docker-compose
+  - docker-compose --version
+  # install bats
   - sudo add-apt-repository ppa:duggan/bats --yes
   - sudo apt-get update -qq
   - sudo apt-get install -qq bats
+  # prepare docker images
   - make update-dependencies
 
 matrix:
   include:
     - env: TEST_ID=test-debian
     - env: TEST_ID=test-alpine
+    - env: TEST_ID=test2-debian
+    - env: TEST_ID=test2-alpine
+  allow_failures:
+    - env: TEST_ID=test2-debian
+    - env: TEST_ID=test2-alpine
 
 script:
   - make $TEST_ID