Add circleci config

.circleci/config.yml

@@ -0,0 +1,37 @@
+# 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:9.9.0
+
+ # Specify service dependencies here if necessary
+ # CircleCI maintains a library of pre-built images
+ # documented at https://circleci.com/docs/2.0/circleci-images/
+ # - image: circleci/mongo:3.4.4
+
+ 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: yarn install
+
+ - save_cache:
+ paths:
+ - node_modules
+ key: v1-dependencies-{{ checksum "package.json" }}
+
+ # run tests!
+ - run: yarn test