Improve code quality and write tests

node_modules/codecov/lib/services/cirrus.js

@@ -0,0 +1,17 @@
+module.exports = {
+  detect: function() {
+    return !!process.env.CIRRUS_CI
+  },
+  configuration: function() {
+    console.log('    Cirrus CI Detected')
+    return {
+      service: 'cirrusci',
+      build: process.env.CIRRUS_BUILD_ID,
+      job: process.env.CIRRUS_TASK_ID,
+      commit: process.env.CIRRUS_CHANGE_IN_REPO,
+      branch: process.env.CIRRUS_BRANCH,
+      pr: process.env.CIRRUS_PR,
+      slug: process.env.CIRRUS_REPO_FULL_NAME,
+    }
+  },
+}