fix test

lib/types/multipart.js

@@ -265,17 +265,20 @@ function Multipart (boy, cfg) {
   }).on('error', function (err) {
     boy.emit('error', err)
   }).on('finish', function () {
+    if (self._nparts === 0 && self._boundaryNotFound) {
+      boy.emit('error', new Error('Unexpected end of multipart data'))
+    }
     finished = true
     checkFinished()
   })
 }
 
 Multipart.prototype.write = function (chunk, cb) {
-  let r
-  if ((r = this.parser.write(chunk)) && !this._pause) {
-    if (this._boundaryNotFound && (this._nparts !== 0 || this._checkBoundary(chunk))) {
-      this._boundaryNotFound = false
-    }
+  if (this._boundaryNotFound && (this._nparts !== 0 || this._checkBoundary(chunk))) {
+    this._boundaryNotFound = false
+  }
+  const r = this.parser.write(chunk)
+  if (r && !this._pause) {
     cb()
   } else {
     this._needDrain = !r
@@ -285,9 +288,6 @@ Multipart.prototype.write = function (chunk, cb) {
 
 Multipart.prototype.end = function () {
   const self = this
-  if (self._boundaryNotFound) {
-    self._boy.emit('error', new Error('Unexpected end of multipart data'))
-  }
   if (self._nparts === 0 && !self._boy._done) {
     process.nextTick(function () {
       self._boy._done = true
@@ -304,8 +304,8 @@ Multipart.prototype._checkBoundary = function (chunk) {
   if (
     chunk[0] !== DASH /* - */ ||
     chunk[1] !== DASH /* - */ ||
-    chunk[boundaryLen] !== DASH /* - */ ||
-    chunk[boundaryLen + 1] !== DASH /* - */
+    chunk[2 + boundaryLen] !== DASH /* - */ ||
+    chunk[2 + boundaryLen + 1] !== DASH /* - */
   ) {
     return false
   }