Function FakeSMTPServer

internal/testutil/fakesmtp.go:29–63

FakeSMTPServer starts a minimal SMTP server that accepts messages. Returns the address and a function to call to stop the server and get received messages.

(t *testing.T)

// FakeSMTPServer starts a minimal SMTP server that accepts messages.
// Returns the address and a function to call to stop the server and get received messages.
func FakeSMTPServer(t *testing.T) (SMTPAddr, func() []SMTPMessage) {
	t.Helper()

	listener, err := net.Listen("tcp", "127.0.0.1:0")
	if err != nil {
		t.Fatalf("FakeSMTPServer: listen: %v", err)
	}

	addr := listener.Addr().(*net.TCPAddr)
	result := SMTPAddr{Host: addr.IP.String(), Port: addr.Port}

	var mu sync.Mutex
	var messages []SMTPMessage

	go func() {
		for {
			conn, err := listener.Accept()
			if err != nil {
				return // listener closed
			}
			go handleSMTPConn(conn, &mu, &messages)
		}
	}()

	t.Cleanup(func() { listener.Close() })

	return result, func() []SMTPMessage {
		listener.Close()
		mu.Lock()
		defer mu.Unlock()
		out := make([]SMTPMessage, len(messages))
		copy(out, messages)
		return out
	}
}

func handleSMTPConn(conn net.Conn, mu *sync.Mutex, messages *[]SMTPMessage) {
	defer conn.Close()