Improve code quality and write tests

node_modules/codecov/lib/services/teamcity.js

@@ -0,0 +1,17 @@
+module.exports = {
+
+    detect: function () {
+        return !!process.env.TEAMCITY_VERSION;
+    },
+
+    configuration: function () {
+        console.log('    TeamCity CI Detected');
+        return {
+            service: 'teamcity',
+            commit: process.env.BUILD_VCS_NUMBER,
+            branch: process.env.BRANCH_NAME,
+            build: process.env.BUILD_NUMBER
+        };
+    }
+
+};