diff --git a/build-system/tasks/runtime-test.js b/build-system/tasks/runtime-test.js
index d0641552558ff..f6eb4e5165d15 100644
--- a/build-system/tasks/runtime-test.js
+++ b/build-system/tasks/runtime-test.js
@@ -239,8 +239,6 @@ function runTests() {
     log(red('ERROR:'), 'Only integration tests may be run on the full set of ' +
         'Sauce Labs browsers');
     log('Use', cyan('--saucelabs'), 'with', cyan('--integration'));
-    // Flush stdout.
-    process.stdout.write('\n');
     process.exit();
   }
 
@@ -337,22 +335,14 @@ function runTests() {
   }
 
   // Run fake-server to test XHR responses.
-  const server = gulp.src(process.cwd())
-      .pipe(webserver({
-        port: 31862,
-        host: 'localhost',
-        directoryListing: true,
-        middleware: [app],
-      })
-          .on('kill', function() {
-            log(yellow(
-                'Shutting down test responses server on localhost:31862'));
-            process.nextTick(function() {
-              // Flush stdout.
-              process.stdout.write('\n');
-              process.exit();
-            });
-          }));
+  const server = gulp.src(process.cwd()).pipe(webserver({
+    port: 31862,
+    host: 'localhost',
+    directoryListing: true,
+    middleware: [app],
+  }).on('kill', function() {
+    log(yellow('Shutting down test responses server on localhost:31862'));
+  }));
   log(yellow(
       'Started test responses server on localhost:31862'));
 
@@ -380,12 +370,8 @@ function runTests() {
       log(
           red('ERROR:'),
           yellow('Karma test failed with exit code ' + exitCode));
-      // Flush stdout.
-      process.stdout.write('\n');
-      process.exit(exitCode);
-    } else {
-      resolver();
     }
+    resolver();
   }).on('run_start', function() {
     if (argv.saucelabs || argv.saucelabs_lite) {
       console./* OK*/log(green(