Updated the files.

my-app/node_modules/karma/lib/middleware/stopper.js

@@ -0,0 +1,18 @@
+/**
+ * Stopper middleware is responsible for communicating with `karma stop`.
+ */
+
+const log = require('../logger').create('middleware:stopper')
+
+function createStopperMiddleware (urlRoot) {
+  return function (request, response, next) {
+    if (request.url !== urlRoot + 'stop') return next()
+    response.writeHead(200)
+    log.info('Stopping server')
+    response.end('OK')
+    process.kill(process.pid, 'SIGINT')
+  }
+}
+
+createStopperMiddleware.$inject = ['config.urlRoot']
+exports.create = createStopperMiddleware