From 84614d9997a69bac249f3e8ac3b90240b38ca747 Mon Sep 17 00:00:00 2001
From: "Tobin C. Harding" <me@tobin.cc>
Date: Wed, 16 Aug 2023 16:03:33 +1000
Subject: [PATCH] Unit test debug print of witness with empty instruction

We recently fixed a bug that causes a panic if a `Witness` contains an
empty instruction. Add a unit test to verify it.
---
 bitcoin/src/blockdata/witness.rs | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/bitcoin/src/blockdata/witness.rs b/bitcoin/src/blockdata/witness.rs
index 3d10a0a0..43e69d69 100644
--- a/bitcoin/src/blockdata/witness.rs
+++ b/bitcoin/src/blockdata/witness.rs
@@ -535,6 +535,16 @@ mod test {
         v
     }
 
+    #[test]
+    fn witness_debug_can_display_empty_instruction() {
+        let witness = Witness {
+            witness_elements: 1,
+            content: append_u32_vec(vec![], &[0]),
+            indices_start: 2,
+        };
+        println!("{:?}", witness);
+    }
+
     #[test]
     fn test_push() {
         let mut witness = Witness::default();