add test case

event.go

@@ -1,6 +1,7 @@
 package sseread
 
 import (
+	"bytes"
 	"encoding/json"
 	"strings"
 )
@@ -23,6 +24,7 @@ type Event struct {
 // ParseEventLine is a method of the Event struct that parses an event field based on the event type.
 // It takes an event type and event data as input, and updates the corresponding field in the Event struct.
 func (e *Event) ParseEventLine(lineType string, lineData []byte) {
+
 	switch strings.TrimSpace(lineType) {
 	case "event":
 		e.Event = string(lineData) // If the event type is "event", update the Event field.
@@ -31,6 +33,11 @@ func (e *Event) ParseEventLine(lineType string, lineData []byte) {
 	case "retry":
 		e.ID = string(lineData) // If the event type is "retry", update the Retry field.
 	case "data":
-		e.Data = lineData // If the event type is "data", update the Data field.
+		if bytes.EqualFold(lineData, []byte("[DONE]")) {
+			e.Data = nil
+		} else {
+			e.Data = lineData // If the event type is "data", update the Data field.
+		}
 	}
+
 }