packet

lib/message/connack_test.go

@@ -0,0 +1,160 @@
+// Copyright (c) 2014 The SurgeMQ Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package message
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestConnackMessageFields(t *testing.T) {
+	msg := NewConnackMessage()
+
+	msg.SetSessionPresent(true)
+	require.True(t, msg.SessionPresent(), "Error setting session present flag.")
+
+	msg.SetSessionPresent(false)
+	require.False(t, msg.SessionPresent(), "Error setting session present flag.")
+
+	msg.SetReturnCode(ConnectionAccepted)
+	require.Equal(t, ConnectionAccepted, msg.ReturnCode(), "Error setting return code.")
+}
+
+func TestConnackMessageDecode(t *testing.T) {
+	msgBytes := []byte{
+		byte(CONNACK << 4),
+		2,
+		0, // session not present
+		0, // connection accepted
+	}
+
+	msg := NewConnackMessage()
+
+	n, err := msg.Decode(msgBytes)
+
+	require.NoError(t, err, "Error decoding message.")
+	require.Equal(t, len(msgBytes), n, "Error decoding message.")
+	require.False(t, msg.SessionPresent(), "Error decoding session present flag.")
+	require.Equal(t, ConnectionAccepted, msg.ReturnCode(), "Error decoding return code.")
+}
+
+// testing wrong message length
+func TestConnackMessageDecode2(t *testing.T) {
+	msgBytes := []byte{
+		byte(CONNACK << 4),
+		3,
+		0, // session not present
+		0, // connection accepted
+	}
+
+	msg := NewConnackMessage()
+
+	_, err := msg.Decode(msgBytes)
+	require.Error(t, err, "Error decoding message.")
+}
+
+// testing wrong message size
+func TestConnackMessageDecode3(t *testing.T) {
+	msgBytes := []byte{
+		byte(CONNACK << 4),
+		2,
+		0, // session not present
+	}
+
+	msg := NewConnackMessage()
+
+	_, err := msg.Decode(msgBytes)
+	require.Error(t, err, "Error decoding message.")
+}
+
+// testing wrong reserve bits
+func TestConnackMessageDecode4(t *testing.T) {
+	msgBytes := []byte{
+		byte(CONNACK << 4),
+		2,
+		64, // <- wrong size
+		0,  // connection accepted
+	}
+
+	msg := NewConnackMessage()
+
+	_, err := msg.Decode(msgBytes)
+	require.Error(t, err, "Error decoding message.")
+}
+
+// testing invalid return code
+func TestConnackMessageDecode5(t *testing.T) {
+	msgBytes := []byte{
+		byte(CONNACK << 4),
+		2,
+		0,
+		6, // <- wrong code
+	}
+
+	msg := NewConnackMessage()
+
+	_, err := msg.Decode(msgBytes)
+	require.Error(t, err, "Error decoding message.")
+}
+
+func TestConnackMessageEncode(t *testing.T) {
+	msgBytes := []byte{
+		byte(CONNACK << 4),
+		2,
+		1, // session present
+		0, // connection accepted
+	}
+
+	msg := NewConnackMessage()
+	msg.SetReturnCode(ConnectionAccepted)
+	msg.SetSessionPresent(true)
+
+	dst := make([]byte, 10)
+	n, err := msg.Encode(dst)
+
+	require.NoError(t, err, "Error decoding message.")
+	require.Equal(t, len(msgBytes), n, "Error encoding message.")
+	require.Equal(t, msgBytes, dst[:n], "Error encoding connack message.")
+}
+
+// test to ensure encoding and decoding are the same
+// decode, encode, and decode again
+func TestConnackDecodeEncodeEquiv(t *testing.T) {
+	msgBytes := []byte{
+		byte(CONNACK << 4),
+		2,
+		0, // session not present
+		0, // connection accepted
+	}
+
+	msg := NewConnackMessage()
+	n, err := msg.Decode(msgBytes)
+
+	require.NoError(t, err, "Error decoding message.")
+	require.Equal(t, len(msgBytes), n, "Error decoding message.")
+
+	dst := make([]byte, 100)
+	n2, err := msg.Encode(dst)
+
+	require.NoError(t, err, "Error decoding message.")
+	require.Equal(t, len(msgBytes), n2, "Error decoding message.")
+	require.Equal(t, msgBytes, dst[:n2], "Error decoding message.")
+
+	n3, err := msg.Decode(dst)
+
+	require.NoError(t, err, "Error decoding message.")
+	require.Equal(t, len(msgBytes), n3, "Error decoding message.")
+}