op-reth: test the proofs multiproof V2 path

rust/op-reth/crates/trie/Cargo.toml

@@ -78,6 +78,7 @@ reth-evm-ethereum.workspace = true
 reth-storage-errors.workspace = true
 secp256k1 = { workspace = true, features = ["rand", "std"] }
 mockall.workspace = true
+rstest.workspace = true
 eyre.workspace = true
 
 # misc

rust/op-reth/crates/trie/src/engine/buffer/mod.rs

@@ -9,4 +9,4 @@
 #[cfg(feature = "metrics")]
 mod metrics;
 pub(super) mod overlay;
-pub(super) mod state;
+pub(crate) mod state;

rust/op-reth/crates/trie/src/engine/buffer/state.rs

@@ -110,7 +110,7 @@ impl TrieBufferState {
     }
 
     /// Insert a block into the buffer.
-    pub(in crate::engine) fn insert(&self, block: BlockWithParent, diff: BlockStateDiff) {
+    pub(crate) fn insert(&self, block: BlockWithParent, diff: BlockStateDiff) {
         self.inner.insert(block, diff);
     }
 

rust/op-reth/crates/trie/src/engine/mod.rs

@@ -8,7 +8,7 @@
 //! handle, in-flight tracking) and processes engine action messages one at
 //! a time, which structurally enforces the serial-call invariant.
 
-mod buffer;
+pub(crate) mod buffer;
 pub mod persistence;
 mod tasks;
 

rust/op-reth/crates/trie/src/proof.rs

@@ -432,3 +432,6 @@ where
             .compute(target)
     }
 }
+
+#[cfg(test)]
+mod tests;