Make e2e test more deterministic

crates/rbuilder/src/integration/playground.rs

@@ -108,6 +108,10 @@ impl Playground {
         Ok(event)
     }
 
+    pub fn rbuilder_rpc_url(&self) -> &str {
+        "http://localhost:8645"
+    }
+
     pub fn el_url(&self) -> &str {
         "http://localhost:8545"
     }

crates/rbuilder/src/integration/simple.rs

@@ -4,7 +4,7 @@ mod tests {
 
     use alloy_network::TransactionBuilder;
     use alloy_primitives::U256;
-    use alloy_provider::{Provider, ProviderBuilder};
+    use alloy_provider::{PendingTransactionBuilder, Provider, ProviderBuilder};
     use alloy_rpc_types::TransactionRequest;
     use std::str::FromStr;
     use test_utils::ignore_if_env_not_set;
@@ -13,6 +13,7 @@ mod tests {
     #[ignore_if_env_not_set("PLAYGROUND_DIR")] // TODO: Change with a custom macro (i.e ignore_if_not_playground)
     #[tokio::test]
     async fn test_simple_example() {
+        // This test sends a transaction ONLY to the builder and waits for the block to be built with it.
         let srv = Playground::new().unwrap();
         srv.wait_for_next_slot().await.unwrap();
 
@@ -30,9 +31,23 @@ mod tests {
             .with_gas_price(gas_price)
             .with_gas_limit(21000);
 
-        let pending_tx = provider.send_transaction(tx).await.unwrap();
-        let receipt = pending_tx.get_receipt().await.unwrap();
+        let tx = provider.fill(tx).await.unwrap();
+
+        // send the transaction ONLY to the builder
+        let rbuilder_provider =
+            ProviderBuilder::new().on_http(Url::parse(srv.rbuilder_rpc_url()).unwrap());
+        let pending_tx = rbuilder_provider
+            .send_tx_envelope(tx.as_envelope().unwrap().clone())
+            .await
+            .unwrap();
+
+        // wait for the transaction in the el node since rbuilder does not implement
+        // the `eth_getTransactionReceipt` method.
+        let binding = ProviderBuilder::new().on_http(Url::parse(srv.el_url()).unwrap());
+        let pending_tx = PendingTransactionBuilder::new(&binding, *pending_tx.tx_hash())
+            .with_timeout(Some(std::time::Duration::from_secs(60)));
 
+        let receipt = pending_tx.get_receipt().await.unwrap();
         srv.validate_block_built(receipt.block_number.unwrap())
             .await
             .unwrap();