fix test

core/coins/format.go

@@ -84,6 +84,11 @@ func FormatCoins(coins []*basev1beta1.Coin, metadata []*bankv1beta1.Metadata) (s
 		if err != nil {
 			return "", err
 		}
+		// If a coin contains a comma, return an error given that the output
+		// could be misinterpreted by the user as 2 different coins.
+		if strings.Contains(formatted[i], ",") {
+			return "", fmt.Errorf("coin %s contains a comma", formatted[i])
+		}
 	}
 
 	if len(coins) == 0 {