rtuclient_prop_test.go

package modbus

import (
	"testing"

	"github.com/google/go-cmp/cmp"
	"pgregory.net/rapid"
)

func TestRTUEncodeDecode(t *testing.T) {
	rapid.Check(t, func(t *rapid.T) {
		packager := &rtuPackager{
			SlaveID: rapid.Byte().Draw(t, "SlaveID"),
		}

		pdu := &ProtocolDataUnit{
			FunctionCode: rapid.Byte().Draw(t, "FunctionCode"),
			Data:         rapid.SliceOf(rapid.Byte()).Draw(t, "Data"),
		}

		raw, err := packager.Encode(pdu)
		if err != nil {
			t.Fatalf("error while encoding: %+v", err)
		}

		dpdu, err := packager.Decode(raw)
		if err != nil {
			t.Fatalf("error while decoding: %+v", err)
		}

		if !cmp.Equal(pdu, dpdu) {
			t.Errorf("invalid pdu: %s", cmp.Diff(pdu, dpdu))
		}
	})
}