Include Rent in ProgramTest::start() output

program-test/src/lib.rs

@@ -387,6 +387,14 @@ impl Default for ProgramTest {
     }
 }
 
+// Values returned by `ProgramTest::start`
+pub struct StartOutputs {
+    pub banks_client: BanksClient,
+    pub payer: Keypair,
+    pub recent_blockhash: Hash,
+    pub rent: Rent,
+}
+
 impl ProgramTest {
     pub fn new(
         program_name: &str,
@@ -536,7 +544,7 @@ impl ProgramTest {
     ///
     /// Returns a `BanksClient` interface into the test environment as well as a payer `Keypair`
     /// with SOL for sending transactions
-    pub async fn start(self) -> (BanksClient, Keypair, Hash) {
+    pub async fn start(self) -> StartOutputs {
         {
             use std::sync::Once;
             static ONCE: Once = Once::new();
@@ -555,7 +563,8 @@ impl ProgramTest {
             bootstrap_validator_stake_lamports,
         );
         let mut genesis_config = gci.genesis_config;
-        genesis_config.rent = Rent::default();
+        let rent = Rent::default();
+        genesis_config.rent = rent;
         genesis_config.fee_rate_governor =
             solana_program::fee_calculator::FeeRateGovernor::default();
         let payer = gci.mint_keypair;
@@ -607,6 +616,11 @@ impl ProgramTest {
             .unwrap_or_else(|err| panic!("Failed to start banks client: {}", err));
 
         let recent_blockhash = banks_client.get_recent_blockhash().await.unwrap();
-        (banks_client, payer, recent_blockhash)
+        StartOutputs {
+            banks_client,
+            payer,
+            recent_blockhash,
+            rent,
+        }
     }
 }