Add CircleCI configuration

Config copied from deck-of-cards

.circleci/config.yml

@@ -0,0 +1,76 @@
+# Javascript Node CircleCI 2.0 configuration file
+#
+# Check https://circleci.com/docs/2.0/language-javascript/ for more details
+#
+version: 2
+jobs:
+  build:
+    branches:
+      ignore:
+        - gh-pages
+
+    docker:
+      # specify the version you desire here
+      - image: circleci/node:7.10
+
+      # 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: npm install
+
+      - save_cache:
+          paths:
+            - node_modules
+          key: v1-dependencies-{{ checksum "package.json" }}
+
+      # run tests!
+      - run:
+          name: Run Tests/Coverage
+          command: npm run coverage
+
+      - run:
+          name: Update CodeCov.io based on coverage results
+          command: if [ $? -eq 0 ]; then bash <(curl -s https://codecov.io/bash); fi
+
+      - run:
+          name: Install JUnit coverage reporter
+          command: npm install --only=dev jest-junit
+
+      - run:
+          name: Make reports directory
+          command: mkdir -p reports
+
+      - run:
+          name: Run tests with JSON output
+          command: npm run coverage -- --json --outputFile=reports/js-test-results.json
+
+      - run:
+          environment:
+            JEST_JUNIT_OUTPUT: "reports/js-test-results.xml"
+          name: Run tests with JUnit as reporter
+          command: npm run test -- --runInBand --ci --reporters=default --reporters=jest-junit
+          when: always
+
+      # - run:
+      #     name: Generate eslint report in JUnit format
+      #     command: npm run lint -- --format junit -o reports/js-lint-results.xml
+      #     when: always
+
+      - store_test_results:
+          path: reports
+      - store_artifacts:
+          path: reports