set validation

Signed-off-by: Owen Williams <owen.williams@grafana.com>

Author: ywwg

expfmt/decode_test.go

@@ -80,7 +80,10 @@ mf2 4
 	)
 
 	dec := &SampleDecoder{
-		Dec: &textDecoder{r: strings.NewReader(in)},
+		Dec: &textDecoder{
+			s: model.UTF8Validation,
+			r: strings.NewReader(in),
+		},
 		Opts: &DecodeOptions{
 			Timestamp: ts,
 		},