fix sbf sysvar test (solana-labs#32803)

* fix sbf sysvar test

* typo

---------

Co-authored-by: HaoranYi <haoran.yi@solana.com>

program-test/src/lib.rs

@@ -25,7 +25,7 @@ use {
         runtime_config::RuntimeConfig,
     },
     solana_sdk::{
-        account::{Account, AccountSharedData},
+        account::{create_account_shared_data_for_test, Account, AccountSharedData},
         account_info::AccountInfo,
         clock::Slot,
         entrypoint::{deserialize, ProgramResult, SUCCESS},
@@ -591,6 +591,11 @@ impl ProgramTest {
         );
     }
 
+    pub fn add_sysvar_account<S: Sysvar>(&mut self, address: Pubkey, sysvar: &S) {
+        let account = create_account_shared_data_for_test(sysvar);
+        self.add_account(address, account.into());
+    }
+
     /// Add a SBF program to the test environment.
     ///
     /// `program_name` will also be used to locate the SBF shared object in the current or fixtures

programs/sbf/rust/sysvar/src/lib.rs

@@ -129,13 +129,9 @@ pub fn process_instruction(
     {
         msg!("EpochRewards identifier:");
         sysvar::epoch_rewards::id().log();
-        let epoch_rewards = EpochRewards::from_account_info(&accounts[11]);
-        // epoch_rewards sysvar should only be valid during epoch reward period. In this test case,
-        // the test bank is outside reward period. Therefore, we expect that the epoch_rewards
-        // sysvar doesn't exist.
-        assert!(epoch_rewards.is_err());
-        let got_epoch_rewards = EpochRewards::get();
-        assert!(got_epoch_rewards.is_err());
+        let epoch_rewards = EpochRewards::from_account_info(&accounts[11]).unwrap();
+        let got_epoch_rewards = EpochRewards::get()?;
+        assert_eq!(epoch_rewards, got_epoch_rewards);
     }
 
     Ok(())

programs/sbf/rust/sysvar/tests/lib.rs

@@ -20,11 +20,18 @@ use {
 async fn test_sysvars() {
     let program_id = Pubkey::new_unique();
 
-    let program_test = ProgramTest::new(
+    let mut program_test = ProgramTest::new(
         "solana_sbf_rust_sysvar",
         program_id,
         processor!(process_instruction),
     );
+
+    let epoch_rewards = epoch_rewards::EpochRewards {
+        total_rewards: 100,
+        distributed_rewards: 50,
+        distribution_complete_block_height: 42,
+    };
+    program_test.add_sysvar_account(epoch_rewards::id(), &epoch_rewards);
     let (mut banks_client, payer, recent_blockhash) = program_test.start().await;
 
     let mut transaction = Transaction::new_with_payer(
@@ -59,6 +66,7 @@ async fn test_sysvars() {
         processor!(process_instruction),
     );
     program_test.deactivate_feature(disable_fees_sysvar::id());
+    program_test.add_sysvar_account(epoch_rewards::id(), &epoch_rewards);
     let (mut banks_client, payer, recent_blockhash) = program_test.start().await;
 
     let mut transaction = Transaction::new_with_payer(

runtime/src/bank.rs

@@ -3541,7 +3541,7 @@ impl Bank {
         }
     }
 
-    /// Create EpochRewards syavar with calculated rewards
+    /// Create EpochRewards sysvar with calculated rewards
     fn create_epoch_rewards_sysvar(
         &self,
         total_rewards: u64,