Improve code quality and write tests

node_modules/codecov/lib/services/wercker.js

@@ -0,0 +1,22 @@
+// http://devcenter.wercker.com/articles/steps/variables.html
+
+module.exports = {
+  detect: function() {
+    return !!process.env.WERCKER_MAIN_PIPELINE_STARTED
+  },
+
+  configuration: function() {
+    console.log('    Wercker CI Detected')
+    return {
+      service: 'wercker',
+      build: process.env.WERCKER_MAIN_PIPELINE_STARTED,
+      commit: process.env.WERCKER_GIT_COMMIT,
+      build_url: process.env.WERCKER_BUILD_URL,
+      branch: process.env.WERCKER_GIT_BRANCH,
+      slug:
+        process.env.WERCKER_GIT_OWNER +
+        '/' +
+        process.env.WERCKER_GIT_REPOSITORY,
+    }
+  },
+}