test: add integration test for RPC hook accumulation

[niran]

Background

PR #446 fixed the RPC extension hook accumulation issue (#438), but the integration test that verified the fix was removed to avoid a circular dependency between base-client-node and base-metering/base-txpool.

Test to add

The test should verify that multiple RPC-providing extensions are all accessible when installed together:

#[tokio::test(flavor = "multi_thread")]
async fn rpc_hooks_accumulate_across_extensions() -> Result<()> {
    let chain_spec = load_chain_spec();

    // Install multiple RPC-providing extensions
    let mut extensions: Vec<Box<dyn BaseNodeExtension>> = Vec::new();
    extensions.push(Box::new(TxPoolExtension::new(TxpoolConfig {
        tracing_enabled: false,
        tracing_logs_enabled: false,
        sequencer_rpc: None,
    })));
    extensions.push(Box::new(MeteringExtension::new(true, None)));

    let node = LocalNode::new(extensions, Arc::clone(&chain_spec)).await?;

    let client = HttpClientBuilder::default().build(format!("http://{}", node.http_addr()))?;

    // TxPool RPC should be reachable
    let status: TransactionStatusResponse = client
        .request("base_transactionStatus", rpc_params![TxHash::ZERO])
        .await?;
    assert_eq!(Status::Unknown, status.status);

    // Metering RPC should also be reachable
    let meter_result = client
        .request::<serde_json::Value, _>("base_meterBlockByNumber", rpc_params!["latest"])
        .await;
    match meter_result {
        Ok(_) => {}
        Err(ClientError::Call(err)) => {
            assert_ne!(err.code(), ErrorCode::MethodNotFound.code(), "metering RPC missing");
        }
        Err(err) => panic!("unexpected error from metering RPC: {err}"),
    }

    Ok(())
}

Options for location

1. Add to system test framework
2. Create a top-level client integration test crate (e.g., crates/client/tests)
3. Add tests within bin/ crates

Related

• Fixes verification for fix(client): RPC extensions overwrite each other due to reth hook replacement model #438
• Discussed in fix(client): accumulate RPC extension hooks instead of replacing #446