tweak e2e script to allow passing in more flags to npm task

Author: yyx990803

build/nightwatch.config.js

@@ -36,6 +36,14 @@ module.exports = {
         'javascriptEnabled': true,
         'acceptSslCerts': true
       }
+    },
+
+    'phantomjs': {
+      'desiredCapabilities': {
+        'browserName': 'phantomjs',
+        'javascriptEnabled': true,
+        'acceptSslCerts': true
+      }
     }
   }
 }

test/e2e/runner.js

@@ -1,19 +1,22 @@
 var path = require('path')
+var spawn = require('cross-spawn')
 var httpServer = require('http-server')
 var server = httpServer.createServer({
   root: path.resolve(__dirname, '../../')
 })
 
 server.listen(8080)
 
-var spawn = require('cross-spawn')
-var args = [
-  '--config', 'build/nightwatch.config.js',
-  '--env', 'chrome,firefox'
-]
-
-if (process.argv[2]) {
-  args.push('--test', 'test/e2e/specs/' + process.argv[2])
+var args = process.argv.slice(2)
+if (args.indexOf('--config') === -1) {
+  args = args.concat(['--config', 'build/nightwatch.config.js'])
+}
+if (args.indexOf('--env') === -1) {
+  args = args.concat(['--env', 'chrome,firefox'])
+}
+var i = args.indexOf('--test')
+if (i > -1) {
+  args[i + 1] = 'test/e2e/specs/' + args[i + 1]
 }
 
 var runner = spawn('./node_modules/.bin/nightwatch', args, {