split STREAM and ACK frames in seperate files

ack_frame_test.go

@@ -0,0 +1,21 @@
+package quic
+
+import (
+	"bytes"
+
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+)
+
+var _ = Describe("AckFrame", func() {
+	Context("when writing", func() {
+		It("writes simple frames", func() {
+			b := &bytes.Buffer{}
+			(&AckFrame{
+				Entropy:         2,
+				LargestObserved: 1,
+			}).Write(b)
+			Expect(b.Bytes()).To(Equal([]byte{0x48, 0x02, 0x01, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0}))
+		})
+	})
+})