Enable reading from a closed gbytes.Buffer (#575)

gbytes/buffer.go

@@ -87,17 +87,11 @@ func (b *Buffer) Write(p []byte) (n int, err error) {
 /*
 Read implements the io.Reader interface. It advances the
 cursor as it reads.
-
-Returns an error if called after Close.
 */
 func (b *Buffer) Read(d []byte) (int, error) {
 	b.lock.Lock()
 	defer b.lock.Unlock()
 
-	if b.closed {
-		return 0, errors.New("attempt to read from closed buffer")
-	}
-
 	if uint64(len(b.contents)) <= b.readCursor {
 		return 0, io.EOF
 	}

gbytes/buffer_test.go

@@ -105,19 +105,6 @@ var _ = Describe("Buffer", func() {
 			Expect(err).Should(Equal(io.EOF))
 			Expect(n).Should(Equal(0))
 		})
-
-		Context("after the buffer has been closed", func() {
-			It("returns an error", func() {
-				buffer := BufferWithBytes([]byte("abcde"))
-
-				buffer.Close()
-
-				dest := make([]byte, 3)
-				n, err := buffer.Read(dest)
-				Expect(err).Should(HaveOccurred())
-				Expect(n).Should(Equal(0))
-			})
-		})
 	})
 
 	Describe("detecting regular expressions", func() {