package mailer

import (
	"mime"
	"strings"
	"testing"
)

func TestEncodeSubject(t *testing.T) {
	if got := encodeSubject("Minstrel: 2 updates"); got != "Minstrel: 2 updates" {
		t.Errorf("plain ASCII changed: %q", got)
	}

	enc := encodeSubject("Minstrel: Moe Shop – WWW")
	if !strings.HasPrefix(enc, "=?utf-8?q?") {
		t.Errorf("non-ASCII not RFC 2047 encoded: %q", enc)
	}
	if dec, err := new(mime.WordDecoder).DecodeHeader(enc); err != nil || dec != "Minstrel: Moe Shop – WWW" {
		t.Errorf("round trip = %q, %v", dec, err)
	}

	if got := encodeSubject("Hi\r\nBcc: everyone@example.com"); strings.ContainsAny(got, "\r\n") {
		t.Errorf("a line break survived into the header: %q", got)
	}
}