module.exports = function(config) {
  config.set({
    frameworks: ['mocha', 'chai'],
    files: ['test/**/*.js'],
    reporters: ['progress'],
    port: 9876,  // karma web server port
    colors: true,
    logLevel: config.LOG_INFO,
    browsers: ['ChromeHeadless'],
    autoWatch: false,
    // singleRun: false, // Karma captures browsers, runs the tests and exits
    concurrency: Infinity
  });
};

@@ -292,107 +292,66 @@
     
-// singleRun: false, // Karma captures browsers, runs the tests a
+concurrency: Infinity,%0A    customContextFile: 'i
 nd
- 
 ex
-its%0A    concurrency: Infinity
+.html'
 %0A  %7D

Add custom context file