Add test for empty directories.

test/files.js

@@ -120,23 +120,29 @@ module.exports = (common) => {
         path: `test-folder/${name}`,
         content: fs.readFileSync(path.join(base, name))
       })
+      const emptyDir = (name) => ({
+        path: `test-folder/${name}`,
+        dir: true
+      })
       const dirs = [
         content('pp.txt'),
         content('holmes.txt'),
         content('jungle.txt'),
         content('alice.txt'),
+        emptyDir('empty-folder'),
         content('files/hello.txt'),
         content('files/ipfs.txt'),
+        emptyDir('files/empty')
       ]
 
       ipfs.files.add(dirs, (err, res) => {
         expect(err).to.not.exist
 
         const added = res[res.length - 1]
         const mh = bs58.encode(added.node.multihash()).toString()
-        expect(mh).to.equal('QmW2d9LPX4KxpeLDyH3tqYnHrkRMHx8xMQp9cpXEEj2DyR')
+        expect(mh).to.equal('QmVvjDy7yF7hdnqE8Hrf4MHo5ABDtb5AbX6hWbD3Y42bXP')
         expect(added.path).to.equal('test-folder')
-        expect(added.node.links).to.have.length(5)
+        expect(added.node.links).to.have.length(6)
         done()
       })
     })