package reverseproxy

import (
	"bytes"
	"net/http/httptest"
	"strings"
	"testing"

	"github.com/caddyserver/caddy/v2"
)

func TestHandlerCopyResponse(t *testing.T) {
	h := Handler{}
	testdata := []string{
		"",
		strings.Repeat("a", defaultBufferSize),
		strings.Repeat("123456789 123456789 123456789 12", 3000),
	}

	dst := bytes.NewBuffer(nil)
	recorder := httptest.NewRecorder()
	recorder.Body = dst

	for _, d := range testdata {
		src := bytes.NewBuffer([]byte(d))
		dst.Reset()
		err := h.copyResponse(recorder, src, 0, caddy.Log())
		if err != nil {
			t.Errorf("failed with error: %v", err)
		}
		out := dst.String()
		if out != d {
			t.Errorf("bad read: got %q", out)
		}
	}
}