Implement unit tests, add Babel and Jest, configure CircleCI integration

Author: lloydjatkinson

.babelrc

@@ -3,8 +3,7 @@
         [
             "@babel/preset-env",
             {
-                "debug": true,
-                "modules": false,
+                "debug": false,
                 "targets": {
                     "browsers": [
                         "last 3 versions"

.circleci/.circleci.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:10.7
+      
+      # 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: npm run test

jest.config.js

@@ -1,3 +1,3 @@
 module.exports = {
-    
+    "verbose": true   
 }