container/flv/flv_test.go: wrote test TestVideoTagBytes

Wrote test TestVideoTagBytes which checks that we can get a valid []byte representation of a
VideoTag. The test is passing.

container/flv/flv_test.go

@@ -0,0 +1,77 @@
+/*
+NAME
+  flv_test.go
+
+DESCRIPTION
+  flv_test.go provides testing for functionality provided in flv.go.
+
+AUTHORS
+  Saxon A. Nelson-Milton <saxon@ausocean.org>
+
+LICENSE
+  Copyright (C) 2019 the Australian Ocean Lab (AusOcean)
+
+  It is free software: you can redistribute it and/or modify them
+  under the terms of the GNU General Public License as published by the
+  Free Software Foundation, either version 3 of the License, or (at your
+  option) any later version.
+
+  It is distributed in the hope that it will be useful, but WITHOUT
+  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+  FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+  for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with revid in gpl.txt. If not, see http://www.gnu.org/licenses.
+*/
+
+package flv
+
+import (
+	"bytes"
+	"testing"
+)
+
+func TestVideoTagBytes(t *testing.T) {
+	tests := []struct {
+		tag      VideoTag
+		expected []byte
+	}{
+		{
+			tag: VideoTag{
+				TagType:           VideoTagType,
+				DataSize:          12,
+				Timestamp:         1234,
+				TimestampExtended: 56,
+				FrameType:         KeyFrameType, // 1
+				Codec:             H264,         // 7
+				PacketType:        AVCNALU,      // 1
+				CompositionTime:   0,
+				Data:              []byte{0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07},
+			},
+			expected: []byte{
+				0x09,             // TagType.
+				0x00, 0x00, 0x0c, // DataSize.
+				0x00, 0x04, 0xd2, // Timestamp.
+				0x38,             // TimestampExtended.
+				0x00, 0x00, 0x00, // StreamID. (always 0)
+				0x17,             // FrameType=0001, Codec=0111
+				0x01,             // PacketType.
+				0x00, 0x00, 0x00, // CompositionTime
+				0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, // VideoData.
+				0x00, 0x00, 0x00, 0x00, // previousTagSize.
+			},
+		},
+	}
+
+	for testNum, test := range tests {
+		got := test.tag.Bytes()
+		if !bytes.Equal(got, test.expected) {
+			t.Errorf("did not get expected result for test: %v.\n Got: %v\n Want: %v\n", testNum, got, test.expected)
+		}
+	}
+}
+
+func TestAudioTagBytes(t *testing.T) {
+
+}