package encoding

import (
	"bytes"
	"testing"
)

func TestGSM7EncodeSimpleASCIIString(t *testing.T) {
	coder := &GSM7Coder{}
	var buf bytes.Buffer
	input := "Sunshine"

	expected := []byte{0b11010011, 0b10111001, 0b10111011, 0b10001110, 0b01001110, 0b10111011, 0b11001011}
	coder.Encode(input, &buf)

	if !bytes.Equal(buf.Bytes(), expected) {
		t.Errorf("Expected %v, but got %v", expected, buf.Bytes())
	}
}

func TestGSM7DecodeSimpleASCIIString(t *testing.T) {
	coder := &GSM7Coder{}
	var buf bytes.Buffer
	input := []byte{0b11010011, 0b10111001, 0b10111011, 0b10001110, 0b01001110, 0b10111011, 0b11001011}

	expected := "Sunshine"
	buf.Write(input)
	output := coder.Decode(&buf)

	if output != expected {
		t.Errorf("Expected %v, but got %v", expected, output)
	}
}

func TestGSM7EncodeEmptyString(t *testing.T) {
	coder := &GSM7Coder{}
	var buf bytes.Buffer
	input := ""

	expected := []byte{}
	coder.Encode(input, &buf)

	if !bytes.Equal(buf.Bytes(), expected) {
		t.Errorf("Expected %v, but got %v", expected, buf.Bytes())
	}
}

func TestGSM7DecodeEmptyString(t *testing.T) {
	coder := &GSM7Coder{}
	buf := bytes.NewBuffer([]byte{})

	expected := ""
	output := coder.Decode(buf)

	if output != expected {
		t.Errorf("Expected %v, but got %v", expected, output)
	}
}