feat(test): add promise polyfill in client tests

Author: klarkc

template/gulp-tasks/test.js

@@ -14,7 +14,10 @@ gulp.task('test:server', () => {
 
 gulp.task('test:client', (done) => {
   new Server({
-    files: [path.resolve(dirs.testClient, '**/*.test.js')],
+    files: [
+      'node_modules/babel-polyfill/dist/polyfill.js',
+      path.resolve(dirs.testClient, '**/*.test.js'),
+    ],
     configFile: path.resolve(dirs.test, 'karma.conf.js'),
     singleRun: true,
   }, done).start();

template/package.json

@@ -24,6 +24,7 @@
   },
   "devDependencies": {
     "babel-core": "^6.25.0",
+    "babel-polyfill": "^6.26.0",
     "babel-preset-es2015": "^6.24.1",
     "babelify": "^7.3.0",
     "browserify": "^14.4.0",