test(chain) use Anchor generic on init_graph

crates/chain/tests/test_tx_graph.rs

@@ -10,8 +10,10 @@ use bdk_chain::{
 use bitcoin::{
     absolute, hashes::Hash, BlockHash, OutPoint, ScriptBuf, Transaction, TxIn, TxOut, Txid,
 };
+use common::*;
 use core::iter;
 use std::vec;
+use rand::RngCore;
 
 #[test]
 fn insert_txouts() {
@@ -1172,3 +1174,38 @@ fn test_missing_blocks() {
         ),
     ]);
 }
+
+#[test]
+fn call_map_anchors_with_non_deterministic_anchor() {
+    #[derive(Debug, Default, Clone, PartialEq, Eq, Copy, PartialOrd, Ord, core::hash::Hash)]
+    /// A non-deterministic anchor
+    pub struct NonDeterministicAnchor {
+        pub anchor_block: BlockId,
+        pub non_deterministic_field: u32,
+    }
+
+    let block_id = BlockId {
+        height: 99,
+        hash: h!("random blockhash"),
+    };
+    let template = [TxTemplate {
+        tx_name: "unconfirmed_coinbase",
+        inputs: &[TxInTemplate::Coinbase],
+        outputs: &[TxOutTemplate::new(5000, Some(0))],
+        anchors: &[ConfirmationHeightAnchor {
+            anchor_block: block_id,
+            confirmation_height: 100,
+        }],
+        ..Default::default()
+    }];
+    let (graph, _, _) = init_graph(&template);
+    let rand = rand::thread_rng().next_u32();
+    let new_graph = graph.map_anchors(|a| NonDeterministicAnchor {
+        anchor_block: a.anchor_block,
+        non_deterministic_field: rand,
+    });
+    let anchors = new_graph.all_anchors();
+    assert_eq!(anchors.len(), 1);
+    assert_eq!(anchors.iter().next().unwrap().0.anchor_block, block_id);
+    assert_eq!(anchors.iter().next().unwrap().0.non_deterministic_field, rand);
+}