feat(ci): set up CircleCI

FIX #5

.circleci/config.yml

@@ -0,0 +1,35 @@
+# Javascript Node CircleCI 2.0 configuration file
+#
+# Check https://circleci.com/docs/2.0/language-javascript/ for more details
+#
+version: 2
+jobs:
+  build:
+    docker:
+      # specify the version you desire here
+      - image: circleci/node:8.10.0
+
+    working_directory: ~/repo
+
+    steps:
+      - checkout
+
+      # Download and cache dependencies
+      - restore_cache:
+          keys:
+          - v1-dependencies-{{ checksum "package.json" }}
+          # fallback to using the latest cache if no exact match is found
+          - v1-dependencies-
+
+      - run: npm install
+      - save_cache:
+          paths:
+            - node_modules
+          key: v1-dependencies-{{ checksum "package.json" }}
+
+      # run tests!
+      - run:
+          command: npm run testnet
+          background: true
+      - run: npm run test
+

package.json

@@ -4,6 +4,7 @@
   "description": "",
   "main": "index.js",
   "scripts": {
+    "postinstall": "node_modules/.bin/truffle install",
     "build": "node_modules/.bin/truffle compile",
     "deploy": "node_modules/.bin/truffle migrate --reset",
     "testnet": "node_modules/.bin/ganache-cli --seed 1234",