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packet_test.go
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packet_test.go
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// Copyright 2019 Sergey Soldatov. All rights reserved.
// This software may be modified and distributed under the terms
// of the Apache license. See the LICENSE file for details.
package modbus
import (
"testing"
)
type testCrc16Checkpair struct {
TypeProtocol ModbusTypeProtocol
data []byte
res bool
}
var testsCrc16Check = []testCrc16Checkpair{
{ModbusRTUviaTCP, []byte{0x1, 0x3, 0x0, 0x0, 0x0, 0xA, 0xCD, 0xC5}, true},
}
func TestModbusPacket_Crc16Check(t *testing.T) {
mp := new(ModbusPacket)
for _, pair := range testsCrc16Check {
mp.Init(pair.TypeProtocol)
copy(mp.PDU, pair.data)
mp.Length = len(pair.data)
res := mp.IsCrcGood()
if res != pair.res {
t.Error(
"For", pair.data,
"expected", pair.res,
"got", res,
)
}
}
}
func TestModbusPacket_GetFunctionCode(t *testing.T) {
test_data := []byte{0x1, 0x3, 0x0, 0x0, 0x0, 0xA, 0xCD, 0xC5}
mp := &ModbusPacket{}
mp.Init(ModbusRTUviaTCP)
copy(mp.PDU, test_data)
mp.Length = len(test_data)
res := mp.GetFunctionCode()
if res != ModbusFunctionCode(0x3) {
t.Error("Expected", byte(0x3), "got", res)
}
test_data = []byte{0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x1, 0x3, 0x0, 0x0, 0x0, 0xA}
mp.Init(ModbusTCP)
copy(mp.PDU, test_data)
mp.Length = len(test_data)
res = mp.GetFunctionCode()
if res != ModbusFunctionCode(0x3) {
t.Error("Expected", byte(0x3), "got", res)
}
}
func TestModbusPacket_GetFC(t *testing.T) {
test_data := []byte{0x1, 0x3, 0x0, 0x0, 0x0, 0xA, 0xCD, 0xC5}
mp := &ModbusPacket{}
mp.Init(ModbusRTUviaTCP)
copy(mp.PDU, test_data)
mp.Length = len(test_data)
res := mp.GetFunctionCode()
if res != FcReadHoldingRegisters {
t.Error("Expected", FcReadHoldingRegisters, "got", res)
}
test_data = []byte{0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x1, 0x3, 0x0, 0x0, 0x0, 0xA}
mp = &ModbusPacket{}
mp.Init(ModbusTCP)
copy(mp.PDU, test_data)
mp.Length = len(test_data)
res = mp.GetFunctionCode()
if res != FcReadHoldingRegisters {
t.Error("Expected", FcReadHoldingRegisters, "got", res)
}
}
func TestModbusPacket_GetCrc(t *testing.T) {
test_data := []byte{0x1, 0x3, 0x0, 0x0, 0x0, 0xA, 0xCD, 0xC5}
mp := &ModbusPacket{}
mp.Init(ModbusRTUviaTCP)
copy(mp.PDU, test_data)
mp.Length = len(test_data)
res := mp.GetCrc()
if res != uint16(0xCDC5) {
t.Error("Expected", uint16(0xCDC5), "got", res)
}
test_data = []byte{0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x1, 0x3, 0x0, 0x0, 0x0, 0xA}
mp = &ModbusPacket{}
mp.Init(ModbusTCP)
copy(mp.PDU, test_data)
mp.Length = len(test_data)
res = mp.GetCrc()
if res != uint16(0x0) {
t.Error("Expected", uint16(0x0), "got", res)
}
}
type testbuildPacketpair struct {
isReq bool
TypeProtocol ModbusTypeProtocol
dev_id byte
fc ModbusFunctionCode
par1, par2 uint16
PDU []byte
}
var testsbuildPacket = []testbuildPacketpair{
{true, ModbusRTUviaTCP, 1, FcReadHoldingRegisters, 0x0, 0xA, []byte{0x1, 0x3, 0x0, 0x0, 0x0, 0xA, 0xC5, 0xCD}},
}
func TestModbusPacket_buildPDU(t *testing.T) {
for _, pair := range testsbuildPacket {
mp := &ModbusPacket{}
mp.Init(pair.TypeProtocol)
mp.buildPDU(pair.dev_id, pair.fc, pair.par1, pair.par2)
for i, v := range mp.PDU[:mp.GetPDULength()] {
if v != pair.PDU[i] {
t.Error(
"For", pair,
"expected", pair.PDU[i],
"got", v,
)
}
}
}
}