Additional test (mutants)

Author: optout21

lightning-invoice/src/test_ser_de.rs

@@ -57,6 +57,19 @@ fn array_u8() {
 	ser_de_test_len([255, 254, 253, 252, 251, 250, 249, 248, 247, 246], "lll0ml8mltul3alk");
 }
 
+#[test]
+fn array_u8_error_invalid_length() {
+	assert_eq!(
+		<[u8; 3]>::from_base32(
+			&"qqqs".to_string().chars().map(|c| Fe32::from_char(c).unwrap()).collect::<Vec<_>>()[..]
+		)
+		.err()
+		.unwrap()
+		.to_string(),
+		"Slice had length 4 instead of 5 in function <[u8; N]>::from_base32()"
+	);
+}
+
 #[test]
 fn payment_secret() {
 	let payment_secret = PaymentSecret([7; 32]);