Add Babel test case

package.json

@@ -42,6 +42,8 @@
   },
   "devDependencies": {
     "@types/express": "^4.11.0",
+    "babel-core": "^6.26.0",
+    "babel-plugin-transform-es2015-modules-commonjs": "^6.26.0",
     "chai": "^4.0.0",
     "eslint": "^4.0.0",
     "express": "4.x",

test/babel.test.js

@@ -0,0 +1,35 @@
+'use strict';
+
+var resolve = require('path').resolve;
+var assert = require('chai').assert;
+var spawnBabel = require('./util/launch-utils').spawnBabel;
+var GET = require('./util/http-utils').GET;
+
+describe('Babel', function() {
+    it('should run the example and respond', function(done) {
+        this.timeout(5000);
+        var js_file = resolve(__dirname, './test-resources/babel-base-case.js');
+        var target = spawnBabel(js_file);
+        var called = false;
+
+        target.stdout.on('data', function(data) {
+            if (data.toString().indexOf('START') === -1) {
+                return;
+            }
+
+            GET('/').then(function() {
+                called = true;
+                target.kill('SIGINT');
+            });
+        });
+
+        target.stderr.on('data', function(data) {
+            console.error(data.toString());
+        });
+
+        target.on('close', function() {
+            assert(called);
+            done();
+        });
+    });
+});

test/test-resources/.eslintrc

@@ -0,0 +1,6 @@
+{
+    "parserOptions": {
+        "ecmaVersion": 2015,
+        "sourceType": "module"
+    }
+}

test/test-resources/babel-base-case.js

@@ -0,0 +1,12 @@
+import express from 'express';
+import Router from '../../lib/express-promise-router.js';
+const router = Router();
+
+router.get('/', function(req, res) {
+    res.send('Hi!');
+});
+
+const app = express();
+app.use(router);
+app.listen(12345);
+console.log('START');

test/util/launch-utils.js

@@ -1,4 +1,5 @@
 var ts = require('typescript');
+var babel = require('babel-core');
 var fs = require('fs');
 var spawn = require('child_process').spawn;
 var dirname = require('path').dirname;
@@ -27,3 +28,13 @@ exports.spawnJavaScript = function spawnJavaScript(path) {
 
     return spawnString(content, dirname(path));
 };
+
+exports.spawnBabel = function spawnBabel(path) {
+    var content = fs.readFileSync(path, 'utf-8');
+
+    var result = babel.transform(content, {
+        plugins: ['transform-es2015-modules-commonjs'],
+    });
+
+    return spawnString(result.code, dirname(path));
+};