Generalize Budget tests to work on multi-ix txs

programs/budget/src/budget_program.rs

@@ -167,34 +167,33 @@ mod test {
     use super::*;
     use solana_budget_api::budget_transaction::BudgetTransaction;
     use solana_budget_api::id;
+    use solana_runtime::runtime;
     use solana_sdk::account::Account;
     use solana_sdk::hash::Hash;
     use solana_sdk::signature::{Keypair, KeypairUtil};
-    use solana_sdk::transaction::{Instruction, Transaction};
+    use solana_sdk::transaction::Transaction;
 
     fn process_transaction(
         tx: &Transaction,
-        program_accounts: &mut [Account],
+        tx_accounts: &mut [Account],
     ) -> Result<(), BudgetError> {
-        assert_eq!(tx.instructions.len(), 1);
+        for ix in &tx.instructions {
-        let Instruction {
+            let mut ix_accounts = runtime::get_subset_unchecked_mut(tx_accounts, &ix.accounts);
-            ref accounts,
+            let mut keyed_accounts: Vec<_> = ix
-            ref userdata,
+                .accounts
-            ..
-        } = tx.instructions[0];
-
-        let mut keyed_accounts: Vec<_> = accounts
                 .iter()
                 .map(|&index| {
                     let index = index as usize;
                     let key = &tx.account_keys[index];
                     (key, index < tx.signatures.len())
                 })
-            .zip(program_accounts.iter_mut())
+                .zip(ix_accounts.iter_mut())
                 .map(|((key, is_signer), account)| KeyedAccount::new(key, is_signer, account))
                 .collect();
 
-        super::process_instruction(&mut keyed_accounts, &userdata)
+            process_instruction(&mut keyed_accounts, &ix.userdata)?;
+        }
+        Ok(())
     }
     #[test]
     fn test_invalid_instruction() {
@@ -219,6 +218,7 @@ mod test {
             Account::new(1, 0, id()),
             Account::new(0, 512, id()),
             Account::new(0, 0, id()),
+            Account::new(0, 0, id()),
         ];
 
         // Initialize BudgetState
@@ -258,6 +258,7 @@ mod test {
             Account::new(1, 0, id()),
             Account::new(0, 512, id()),
             Account::new(0, 0, id()),
+            Account::new(0, 0, id()),
         ];
 
         // Initialize BudgetState

runtime/src/lib.rs

@@ -5,7 +5,7 @@ pub mod bloom;
 mod hash_queue;
 pub mod loader_utils;
 mod native_loader;
-mod runtime;
+pub mod runtime;
 mod status_cache;
 
 #[macro_use]

runtime/src/runtime.rs

@@ -143,7 +143,7 @@ pub fn has_duplicates<T: PartialEq>(xs: &[T]) -> bool {
 }
 
 /// Get mut references to a subset of elements.
-fn get_subset_unchecked_mut<'a, T>(xs: &'a mut [T], indexes: &[u8]) -> Vec<&'a mut T> {
+pub fn get_subset_unchecked_mut<'a, T>(xs: &'a mut [T], indexes: &[u8]) -> Vec<&'a mut T> {
     // Since the compiler doesn't know the indexes are unique, dereferencing
     // multiple mut elements is assumed to be unsafe. If, however, all
     // indexes are unique, it's perfectly safe. The returned elements will share