fix: ensure prevrandao is set on reset fork (#6488)

* fix: ensure prevrandao is set on reset fork

* rustfmt

crates/anvil/src/eth/backend/mem/mod.rs

@@ -398,11 +398,12 @@ impl Backend {
  timestamp: fork_block.timestamp.to_alloy(),
  gas_limit: fork_block.gas_limit.to_alloy(),
  difficulty: fork_block.difficulty.to_alloy(),
- prevrandao: fork_block.mix_hash.map(|h| h.to_alloy()),
+ // ensures prevrandao is set
+ prevrandao: Some(fork_block.mix_hash.map(|h| h.to_alloy()).unwrap_or_default()),
  // Keep previous `coinbase` and `basefee` value
  coinbase: env.block.coinbase,
  basefee: env.block.basefee,
- ..Default::default()
+ ..env.block.clone()
  };
 
  self.time.reset((env.block.timestamp.to_ethers()).as_u64());

crates/anvil/tests/it/fork.rs

@@ -944,3 +944,35 @@ async fn can_override_fork_chain_id() {
  let chain_id = provider.get_chainid().await.unwrap();
  assert_eq!(chain_id.as_u64(), chain_id_override);
 }
+
+// <https://github.com/foundry-rs/foundry/issues/6485>
+#[tokio::test(flavor = "multi_thread")]
+async fn test_fork_reset_moonbeam() {
+ crate::init_tracing();
+ let (api, handle) = spawn(
+ fork_config()
+ .with_eth_rpc_url(Some("https://rpc.api.moonbeam.network".to_string()))
+ .with_fork_block_number(None::<u64>),
+ )
+ .await;
+ let provider = handle.http_provider();
+
+ let accounts: Vec<_> = handle.dev_wallets().collect();
+ let from = accounts[0].address();
+
+ let tx = TransactionRequest::new().to(Address::random()).value(1337u64).from(from);
+ let tx = provider.send_transaction(tx, None).await.unwrap().await.unwrap().unwrap();
+ assert_eq!(tx.status, Some(1u64.into()));
+
+ // reset to check timestamp works after resetting
+ api.anvil_reset(Some(Forking {
+ json_rpc_url: Some("https://rpc.api.moonbeam.network".to_string()),
+ block_number: None,
+ }))
+ .await
+ .unwrap();
+
+ let tx = TransactionRequest::new().to(Address::random()).value(1337u64).from(from);
+ let tx = provider.send_transaction(tx, None).await.unwrap().await.unwrap().unwrap();
+ assert_eq!(tx.status, Some(1u64.into()));
+}