test(mailer): improve - send and fetch mail

mailer/main_test.go

@@ -4,6 +4,8 @@ import (
 	"testing"
 
 	"github.com/stretchr/testify/assert"
+
+	"github.com/go-mail/mail"
 )
 
 func TestSetupAndPing(t *testing.T) {
@@ -23,3 +25,30 @@ func TestSetupAndPing(t *testing.T) {
 	assert.Error(err)
 	mock.Close()
 }
+
+func TestSend(t *testing.T) {
+	assert := assert.New(t)
+
+	mock, s := NewFakeServer()
+	assert.NotNil(mock)
+	// correct setup
+	err := s.Setup()
+	assert.NoError(err)
+
+	m := mail.NewMessage()
+	m.SetHeader("From", "alex@example.com")
+	m.SetHeader("To", "bob@example.com", "cora@example.com")
+	m.SetAddressHeader("Cc", "dan@example.com", "Dan")
+	m.SetHeader("Subject", "Hello!")
+	m.SetBody("text/plain", "Hello Bob and Cora!")
+	m.AddAlternative("text/html", "Hello <b>Bob</b> and <i>Cora</i>!")
+
+	err = s.Dailer.DialAndSend(m)
+	assert.NoError(err)
+
+	msg := <-mock.MSGS
+	mock.Close()
+	assert.Equal("alex@example.com", msg.Header["From"][0])
+	assert.Contains(msg.Body, "Bob and Cora!")
+
+}

mailer/test.go

@@ -10,8 +10,14 @@ import (
 )
 
 type fakeServer struct {
-	s *Service
+	s    *Service
-	l net.Listener
+	l    net.Listener
+	MSGS chan msg
+}
+
+type msg struct {
+	Header textproto.MIMEHeader
+	Body   string
 }
 
 // NewFakeServer - to get mocked Service for mail-service
@@ -28,7 +34,8 @@ func NewFakeServer() (*fakeServer, *Service) {
 
 func newFakeServer(s *Service) (*fakeServer, *Service) {
 	fs := &fakeServer{
-		s: s,
+		s:    s,
+		MSGS: make(chan msg),
 	}
 	l, err := net.Listen("tcp", fmt.Sprintf("%s:%d", fs.s.SMTPHost, fs.s.SMTPPort))
 	if err != nil {
@@ -84,6 +91,30 @@ func (fs *fakeServer) handle(conn net.Conn) {
 		case "QUIT":
 			c.Cmd("221 Bye")
 			return
+		case "DATA":
+			c.Cmd("354 End data with <CR><LF>.<CR><LF>")
+			head, _ := c.ReadMIMEHeader()
+			data := ""
+		handleMsgData:
+			for {
+				s, _ := c.ReadLine()
+				switch s {
+				case ".":
+					break handleMsgData
+				default:
+					data = fmt.Sprintf("%s%s\n", data, s)
+					c.Cmd("250 Ok")
+				}
+
+			}
+			fs.MSGS <- msg{
+				Header: head,
+				Body:   data,
+			}
+		default:
+			// fmt.Println(s)
+			// TODO : MAIL FROM: and RCPT TO:
+			c.Cmd("250 Ok")
 		}
 	}
 }