Improve encoding tests

server/socket.go

@@ -95,11 +95,11 @@ func encode(v interface{}) (string, error) {
 	var s string
 	switch val := v.(type) {
 	case time.Time:
-		var b []byte
-		if !val.IsZero() {
-			b, _ = val.Round(time.Second).Local().MarshalText()
+		if val.IsZero() {
+			s = "null"
+		} else {
+			s = fmt.Sprintf(`"%s"`, val.Format(time.RFC3339))
 		}
-		s = fmt.Sprintf(`"%s"`, string(b))
 	case time.Duration:
 		// must be before stringer to convert to seconds instead of string
 		s = fmt.Sprintf("%d", int64(val.Seconds()))
@@ -112,6 +112,8 @@ func encode(v interface{}) (string, error) {
 	default:
 		if b, err := json.Marshal(v); err == nil {
 			s = string(b)
+		} else {
+			return "", err
 		}
 	}
 	return s, nil