Improve code quality and write tests

node_modules/codecov/lib/services/shippable.js

@@ -0,0 +1,19 @@
+module.exports = {
+  detect: function() {
+    return !!process.env.SHIPPABLE
+  },
+
+  configuration: function() {
+    // http://docs.shippable.com/en/latest/config.html#common-environment-variables
+    console.log('    Shippable CI Detected')
+    return {
+      service: 'shippable',
+      build: process.env.BUILD_NUMBER,
+      build_url: process.env.BUILD_URL,
+      pr: process.env.PULL_REQUEST,
+      commit: process.env.COMMIT,
+      branch: process.env.BRANCH,
+      slug: process.env.REPO_NAME,
+    }
+  },
+}