Merge protractor-coverage results into one file

protractor.conf.js

var grunt = require('grunt'),
   mkdirp = require('mkdirp');

exports.config = {
   // ---------------------------------------------------------------------------
   // ------------- Use your default protractor config and override -------------
   // ------------------ the onPrepare and onCleanup functions  -----------------
   // ---------------------------------------------------------------------------
  
   onPrepare: function() {
      require('jasmine-reporters');
      browser.getCapabilities().then(function (caps) {
         browser.params.browser = caps.get('browserName');
         browser.params.environment = 'LOCAL';
         // Create the directory for the protractor results
         mkdirp('.tmp/results/protractor/' + browser.params.browser, function (err) {
            if (err) {
               throw new Error('Could not create directory ' + directory);
            }
         });
         // Add the Xml Reporter
         jasmine.getEnv().addReporter(
            new jasmine.JUnitXmlReporter('.tmp/results/protractor/' + browser.params.browser, true, true)
         );
         browser.driver.manage().window().maximize();
      });
   },
   onCleanUp: function(exitCode) {
      var mergedAndUpdatedContent = '<?xml version="1.0"?>\n<testsuites>\n';
      var errors = 0,
         tests = 0,
         failures = 0,
         time = 0,
         testcases = '';
      
      grunt.file.expand('.tmp/results/protractor/' + browser.params.browser + '/*').forEach(function (file) {
         var content = grunt.file.read(file);
      
         var match = /\<testsuite.*errors="(\d*)".*tests="(\d*)".*failures="(\d*)".*time="(.*)".*timestamp.*>/g;
         var match = match.exec(content);
      
         errors = errors + Number(match[1]);
         tests = tests + Number(match[2]);
         failures = failures + Number(match[3]);
         time = time + Number(match[4]);
      
         content = content.replace(/\<\?xml.+\?\>/gm, '');
         content = content.replace(/\<testsuites>/gm, '');
         content = content.replace(/\<testsuite.*>/gm, '');
         content = content.replace(/\<\/testsuite>/gm, '');
         content = content.replace(/\<\/testsuites>/gm, '');
         testcases = testcases.concat(content);
      });
      
      var testsuite = '<testsuite ' +
         'name="' + browser.params.browser + '" ' +
         'package="protractor" ' +
         'tests="' + tests + '" ' +
         'errors="' + errors + '" ' +
         'failures="' + failures + '" ' +
         'time="' + time + '">';
      mergedAndUpdatedContent = mergedAndUpdatedContent.concat(testsuite);
      mergedAndUpdatedContent = mergedAndUpdatedContent.concat(testcases);
      mergedAndUpdatedContent = mergedAndUpdatedContent.concat('</testsuite>');
      mergedAndUpdatedContent = mergedAndUpdatedContent.concat('</testsuites>');
      mergedAndUpdatedContent = mergedAndUpdatedContent.replace(/^\s*[\r\n]/gm, "");
      grunt.file.write('.tmp/results/protractor/protractor-' + browser.params.browser + '.xml', mergedAndUpdatedContent);
  }
};