Add sandbox server to the test directory

test/index.html

@@ -0,0 +1,4 @@
+<form action="http://localhost:3001" method="post" enctype="multipart/form-data">
+  <input type="file" name="test" />
+  <input type="submit" />
+</form>

test/test-server.js

@@ -0,0 +1,20 @@
+const app = require('express')();
+const path = require('path');
+const fs = require('fs');
+
+app.use(require('../')({ limit: '250mb' }));
+
+app.get('/', (req, res) => {
+  res.sendFile(path.resolve(__dirname, './index.html'));
+});
+
+app.post('/', (req, res) => {
+  if (req.files.test && req.files.test.name) {
+    res.type(req.files.test.mimetype);
+    res.send(req.files.test.data);
+  } else {
+    res.json(req.files);
+  }
+});
+
+app.listen(3001);