Use docker-compose for testing on Travis CI

Currently running
* seeds
* eslint

.travis.yml

@@ -1,19 +1,27 @@
 language: node_js
 node_js:
   - "10"
-services:
-  - docker
 cache:
   yarn: true
   directories:
     - node_modules
+services:
+  - docker
+env:
+  - DOCKER_COMPOSE_VERSION=1.23.2
+
+before_install:
+  - sudo rm /usr/local/bin/docker-compose
+  - 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
 
 install:
   - docker build --build-arg BUILD_COMMIT=$TRAVIS_COMMIT -t humanconnection/nitro-backend .
 
 script:
-  # TODO: re-add when testing is setup properly
-  # - docker run humanconnection/nitro-backend yarn run db:seed
+- docker run humanconnection/backend:latest yarn run eslint
+- docker-compose run --rm backend yarn run db:seed # seeding needs neo4j
 
 after_success:
   # - wget https://raw.githubusercontent.com/DiscordHooks/travis-ci-discord-webhook/master/send.sh