protocol/rtp: wrote TestPayload

Wrote test TestPayload which will check that we can correctly get the payload from an RTP
packet using Payload for a variety of different RTP packet configurations.

protocol/rtp/parse_test.go

@@ -28,14 +28,14 @@ LICENSE
 package rtp
 
 import (
+	"bytes"
 	"testing"
 )
 
 // TestVersion checks that we can correctly get the version from an RTP packet.
 func TestVersion(t *testing.T) {
 	const expect = 1
-	pkt := (&Pkt{V: expect}).Bytes(nil)
+	got := version((&Pkt{V: expect}).Bytes(nil))
-	got := version(pkt)
 	if got != expect {
 		t.Errorf("unexpected version for RTP packet. Got: %v\n Want: %v\n", got, expect)
 	}
@@ -45,11 +45,13 @@ func TestVersion(t *testing.T) {
 // RTP packet.
 func TestCsrcCount(t *testing.T) {
 	const ver, expect = 2, 2
+
 	pkt := (&Pkt{
 		V:    ver,
 		CC:   expect,
 		CSRC: make([][4]byte, expect),
 	}).Bytes(nil)
+
 	got := csrcCount(pkt)
 	if got != expect {
 		t.Errorf("unexpected csrc count for RTP packet. Got: %v\n Want: %v\n", got, expect)
@@ -70,6 +72,7 @@ func TestHasExt(t *testing.T) {
 			Header: make([][4]byte, 0),
 		},
 	}
+
 	got := hasExt(pkt.Bytes(nil))
 	if !got {
 		t.Error("RTP packet did not have true extension indicator as expected")
@@ -86,6 +89,7 @@ func TestHasExt(t *testing.T) {
 // TestExtHeaderLen checks for a correct extension header len for an RTP packet.
 func TestExtHeaderLen(t *testing.T) {
 	const ver, expect = 2, 3
+
 	pkt := (&Pkt{
 		V: ver,
 		X: true,
@@ -94,8 +98,62 @@ func TestExtHeaderLen(t *testing.T) {
 			Header: make([][4]byte, expect),
 		},
 	}).Bytes(nil)
+
 	got := extHeaderLen(pkt)
 	if got != expect {
 		t.Errorf("Unexpected extension header len. Got: %v\n Want: %v\n", got, expect)
 	}
 }
+
+// TestPayload checks that we can correctly get the payload of an RTP packet
+// using Payload for a variety of RTP packet configurations.
+func TestPayload(t *testing.T) {
+	const ver = 2
+	expect := []byte{0x01, 0x02, 0x03, 0x04, 0x05}
+
+	testPkts := [][]byte{
+		(&Pkt{
+			V:       ver,
+			Payload: expect,
+		}).Bytes(nil),
+
+		(&Pkt{
+			V:       ver,
+			CC:      3,
+			CSRC:    make([][4]byte, 3),
+			Payload: expect,
+		}).Bytes(nil),
+
+		(&Pkt{
+			V: ver,
+			X: true,
+			Extension: ExtensionHeader{
+				ID:     0,
+				Header: make([][4]byte, 3),
+			},
+			Payload: expect,
+		}).Bytes(nil),
+
+		(&Pkt{
+			V:    ver,
+			CC:   3,
+			CSRC: make([][4]byte, 3),
+			Extension: ExtensionHeader{
+				ID:     0,
+				Header: make([][4]byte, 3),
+			},
+			Payload: expect,
+		}).Bytes(nil),
+	}
+
+	for i, p := range testPkts {
+		got, err := Payload(p)
+		if err != nil {
+			t.Errorf("unexpected error from Payload with pkt: %v", i)
+		}
+
+		if !bytes.Equal(got, expect) {
+			t.Errorf("unexpected payload data from RTP packet: %v.\n Got: %v\n Want: %v\n", i, got, expect)
+		}
+	}
+}