package shell

import (
	"bytes"
	"io"
	"testing"
)

// nopCloser wraps a ReadWriter with a no-op Close.
type nopCloser struct {
	io.ReadWriter
}

func (nopCloser) Close() error { return nil }

func TestRecordingChannelPassthrough(t *testing.T) {
	var buf bytes.Buffer
	rc := NewRecordingChannel(nopCloser{&buf})

	// Write through the recorder.
	msg := []byte("hello")
	n, err := rc.Write(msg)
	if err != nil {
		t.Fatalf("Write: %v", err)
	}
	if n != len(msg) {
		t.Errorf("Write n = %d, want %d", n, len(msg))
	}

	// Read through the recorder.
	out := make([]byte, 16)
	n, err = rc.Read(out)
	if err != nil {
		t.Fatalf("Read: %v", err)
	}
	if string(out[:n]) != "hello" {
		t.Errorf("Read = %q, want %q", out[:n], "hello")
	}

	if err := rc.Close(); err != nil {
		t.Fatalf("Close: %v", err)
	}
}