fix #14609

Gruntfile.js

@@ -410,7 +410,7 @@ module.exports = function (grunt) {
   var testSubtasks = [];
   // Skip core tests if running a different subset of the test suite
   if (runSubset('core')) {
-    testSubtasks = testSubtasks.concat(['dist-css', 'dist-js', 'csslint:dist', 'jshint:core', 'jshint:test', 'jshint:grunt', 'jscs:core', 'jscs:test', 'jscs:grunt', 'qunit', 'docs']);
+    testSubtasks = testSubtasks.concat(['dist-css', 'dist-js', 'csslint:dist', 'test-js', 'docs']);
   }
   // Skip HTML validation if running a different subset of the test suite
   if (runSubset('validate-html') &&
@@ -428,6 +428,7 @@ module.exports = function (grunt) {
     testSubtasks.push('saucelabs-qunit');
   }
   grunt.registerTask('test', testSubtasks);
+  grunt.registerTask('test-js', ['jshint:core', 'jshint:test', 'jshint:grunt', 'jscs:core', 'jscs:test', 'jscs:grunt', 'qunit']);
 
   // JS distribution task.
   grunt.registerTask('dist-js', ['concat', 'uglify:core']);