Improve code quality and write tests

node_modules/codecov/lib/detect.js

@@ -0,0 +1,39 @@
+var services = {
+  travis: require('./services/travis'),
+  circle: require('./services/circle'),
+  cirrus: require('./services/cirrus'),
+  buildkite: require('./services/buildkite'),
+  azurePipelines: require('./services/azurePipelines'),
+  codeship: require('./services/codeship'),
+  drone: require('./services/drone'),
+  appveyor: require('./services/appveyor'),
+  wercker: require('./services/wercker'),
+  jenkins: require('./services/jenkins'),
+  semaphore: require('./services/semaphore'),
+  semaphore2x: require('./services/semaphore2x'),
+  snap: require('./services/snap'),
+  gitlab: require('./services/gitlab'),
+  heroku: require('./services/heroku'),
+  teamcity: require('./services/teamcity'),
+  codebuild: require('./services/codebuild'),
+}
+
+var detectProvider = function() {
+  var config
+  for (var name in services) {
+    if (services[name].detect()) {
+      config = services[name].configuration()
+      break
+    }
+  }
+  if (!config) {
+    var local = require('./services/localGit')
+    config = local.configuration()
+    if (!config) {
+      throw new Error('Unknown CI service provider. Unable to upload coverage.')
+    }
+  }
+  return config
+}
+
+module.exports = detectProvider