add test for downloading empty file to fs

package.json

@@ -28,6 +28,7 @@
   "devDependencies": {
     "concat-stream": "^1.5.1",
     "memdb": "^1.3.1",
+    "mkdirp": "^0.5.1",
     "random-access-file": "^1.2.0",
     "standard": "^5.4.1",
     "tape": "^4.4.0"

test/replicates.js

@@ -2,6 +2,7 @@ var tape = require('tape')
 var memdb = require('memdb')
 var path = require('path')
 var fs = require('fs')
+var os = require('os')
 var raf = require('random-access-file')
 var hyperdrive = require('../')
 
@@ -51,8 +52,7 @@ tape('replicates empty files', function (t) {
 
   var archive = drive.createArchive()
 
-  var ws = archive.createFileWriteStream('empty.txt')
-  ws.end()
+  archive.createFileWriteStream('empty.txt').end()
 
   archive.finalize(function (err) {
     t.error(err, 'no error')
@@ -111,3 +111,83 @@ tape('replicates empty directories', function (t) {
     stream.pipe(streamClone).pipe(stream)
   })
 })
+
+tape('downloads empty files to fs', function (t) {
+  var drive = hyperdrive(memdb())
+  var driveClone = hyperdrive(memdb())
+  var tmp = path.join(os.tmpdir(), 'hyperdrive-test')
+
+  var archive = drive.createArchive()
+
+  archive.createFileWriteStream('empty.txt').end()
+
+  archive.finalize(function (err) {
+    t.error(err, 'no error')
+
+    var clone = driveClone.createArchive(archive.key, {
+      file: function (name) {
+        return raf(path.join(tmp, name))
+      }
+    })
+
+    clone.get(0, function (err, entry) {
+      t.error(err, 'no error')
+      t.same(entry.name, 'empty.txt')
+      t.same(entry.length, 0, 'empty')
+
+      clone.download(entry, function (err) {
+        var fileList = fs.readdirSync(tmp).join(' ')
+        t.ok(fileList.indexOf('empty.txt') > -1, 'has empty file')
+        t.error(err, 'no error')
+        t.end()
+      })
+    })
+
+    var stream = archive.replicate()
+    var streamClone = clone.replicate()
+
+    stream.pipe(streamClone).pipe(stream)
+  })
+})
+
+tape('downloads empty directories to fs', function (t) {
+  var drive = hyperdrive(memdb())
+  var driveClone = hyperdrive(memdb())
+  var tmp = path.join(os.tmpdir(), 'hyperdrive-test-2')
+
+  var archive = drive.createArchive()
+
+  archive.append({
+    type: 'directory',
+    name: 'a-dir'
+  })
+
+  archive.finalize(function (err) {
+    t.error(err, 'no error')
+
+    var clone = driveClone.createArchive(archive.key, {
+      file: function (name) {
+        return raf(path.join(tmp, name))
+      }
+    })
+
+    clone.get(0, function (err, entry) {
+      t.error(err, 'no error')
+      t.same(entry.type, 'directory')
+      t.same(entry.name, 'a-dir')
+      t.same(entry.length, 0, 'empty')
+
+      clone.download(0, function (err) {
+        var fileList = fs.readdirSync(tmp).join(' ')
+        t.ok(fileList.indexOf('a-dir') > -1, 'has empty dir')
+        t.error(err, 'no error')
+        t.end()
+      })
+    })
+
+    var stream = archive.replicate()
+    var streamClone = clone.replicate()
+
+    stream.pipe(streamClone).pipe(stream)
+  })
+})