implement writing of RstStreamFrames

frames/rst_stream_frame_test.go

@@ -9,16 +9,36 @@ import (
 )
 
 var _ = Describe("RstStreamFrame", func() {
-	Context("rst stream frames", func() {
-		Context("when parsing", func() {
-			It("accepts sample frame", func() {
-				b := bytes.NewReader([]byte{0x01, 0xEF, 0xBE, 0xAD, 0xDE, 0x44, 0x33, 0x22, 0x11, 0xAD, 0xFB, 0xCA, 0xDE, 0x34, 0x12, 0x37, 0x13})
-				frame, err := ParseRstStreamFrame(b)
-				Expect(err).ToNot(HaveOccurred())
-				Expect(frame.StreamID).To(Equal(protocol.StreamID(0xDEADBEEF)))
-				Expect(frame.ByteOffset).To(Equal(protocol.ByteCount(0xDECAFBAD11223344)))
-				Expect(frame.ErrorCode).To(Equal(uint32(0x13371234)))
-			})
+	Context("when parsing", func() {
+		It("accepts sample frame", func() {
+			b := bytes.NewReader([]byte{0x01, 0xEF, 0xBE, 0xAD, 0xDE, 0x44, 0x33, 0x22, 0x11, 0xAD, 0xFB, 0xCA, 0xDE, 0x34, 0x12, 0x37, 0x13})
+			frame, err := ParseRstStreamFrame(b)
+			Expect(err).ToNot(HaveOccurred())
+			Expect(frame.StreamID).To(Equal(protocol.StreamID(0xDEADBEEF)))
+			Expect(frame.ByteOffset).To(Equal(protocol.ByteCount(0xDECAFBAD11223344)))
+			Expect(frame.ErrorCode).To(Equal(uint32(0x13371234)))
+		})
+	})
+
+	Context("when writing", func() {
+		It("writes a sample RstStreamFrame", func() {
+			frame := RstStreamFrame{
+				StreamID:   0x1337,
+				ByteOffset: 0x11223344DECAFBAD,
+				ErrorCode:  0xDEADBEEF,
+			}
+			b := &bytes.Buffer{}
+			frame.Write(b, 0)
+			Expect(b.Bytes()).To(Equal([]byte{0x01, 0x37, 0x13, 0, 0, 0xAD, 0xFB, 0xCA, 0xDE, 0x44, 0x33, 0x22, 0x11, 0xEF, 0xBE, 0xAD, 0xDE}))
+		})
+
+		It("has the correct min length", func() {
+			rst := RstStreamFrame{
+				StreamID:   0x1337,
+				ByteOffset: 0x1000,
+				ErrorCode:  0xDE,
+			}
+			Expect(rst.MinLength()).To(Equal(protocol.ByteCount(17)))
 		})
 	})
 })