fix adding empty dirs

Author: daviddias

README.md

@@ -77,8 +77,9 @@ Where `data` may be
 - a `Buffer` instance
 - a `Readable` stream
 
-`callback` must follow `function (err, res) {}` signature, where `err` is an
-error if the operation was not successful. `res` will be an array of
+If no `content` is passed, then the path is treated as an empty directory
+
+`callback` must follow `function (err, res) {}` signature, where `err` is an error if the operation was not successful. `res` will be an array of:
 
 ```js
 {
@@ -90,6 +91,7 @@ error if the operation was not successful. `res` will be an array of
 If no `callback` is passed, a promise is returned.
 
 Example:
+
 ```js
 var files = [
   {

src/files.js

@@ -5,8 +5,8 @@ const expect = require('chai').expect
 const bs58 = require('bs58')
 const Readable = require('readable-stream')
 const path = require('path')
-const isNode = require('detect-node')
 const fs = require('fs')
+const isNode = require('detect-node')
 
 module.exports = (common) => {
   describe('.files/add', () => {
@@ -53,8 +53,6 @@ module.exports = (common) => {
     })
 
     it('buffer as tuple', (done) => {
-      if (!isNode) return done()
-
       const file = {
         path: 'testfile.txt',
         content: smallFile
@@ -101,15 +99,16 @@ module.exports = (common) => {
     it('add a nested dir as array', (done) => {
       if (!isNode) {
         return done()
+        // can't run this test cause browserify
+        // can't shim readFileSync in runtime
       }
       const base = path.join(__dirname, 'data/test-folder')
       const content = (name) => ({
         path: `test-folder/${name}`,
         content: fs.readFileSync(path.join(base, name))
       })
       const emptyDir = (name) => ({
-        path: `test-folder/${name}`,
-        dir: true
+        path: `test-folder/${name}`
       })
       const dirs = [
         content('pp.txt'),