Remove debug delimiter

Makes testing unneccessarily hard.

sendmail.go

@@ -20,7 +20,6 @@ var _, debug = os.LookupEnv("DEBUG")
 
 // SendmailDefault points to the default sendmail binary location.
 const SendmailDefault = "/usr/sbin/sendmail"
-const debugDelimiter = "\n----------------------------------------------------------------------"
 
 // Mail defines basic mail structure and headers
 type Mail struct {
@@ -68,9 +67,7 @@ func (m *Mail) Send() error {
 	}
 	m.Header.Set("To", strings.Join(to, ", "))
 	if m.debugOut != nil {
-		fmt.Println(debugDelimiter)
 		m.WriteTo(m.debugOut)
-		fmt.Println(debugDelimiter)
 		return nil
 	}
 

sendmail_test.go

@@ -5,6 +5,8 @@ import (
 	"fmt"
 	"io"
 	"net/mail"
+	"os"
+	"strings"
 	"testing"
 )
 
@@ -50,6 +52,36 @@ func testSend(t *testing.T, withDebug bool) {
 	}
 }
 
+func TestTextMail(t *testing.T) {
+	var buf bytes.Buffer
+	sm := New(
+		Subject("Cześć"),
+		From("Michał", "me@"+domain),
+		To("Ktoś", "info@"+domain),
+		To("Ktoś2", "info2@"+domain),
+		DebugOutput(&buf),
+	)
+	io.WriteString(&sm.Text, ":)\r\n")
+
+	expected := strings.Join([]string{
+		"Content-Type: text/plain; charset=UTF-8",
+		"From: =?utf-8?q?Micha=C5=82?= <[email protected]>",
+		"Subject: =?utf-8?q?Cze=C5=9B=C4=87?=",
+		"To: =?utf-8?q?Kto=C5=9B?= <[email protected]>, =?utf-8?q?Kto=C5=9B2?= <[email protected]>",
+		"",
+		":)",
+		"",
+	}, "\r\n")
+
+	if err := sm.Send(); err != nil {
+		t.Errorf("Error writing to buffer: %v", err)
+	}
+	if actual := buf.String(); actual != expected {
+		fmt.Fprintln(os.Stderr, actual)
+		t.Errorf("Unexpected mail content")
+	}
+}
+
 func TestFromError(t *testing.T) {
 	sm := Mail{
 		To: []*mail.Address{maddr("Ktoś", "info@")},