Add failing test for a Budget payment

programs/budget/Cargo.toml

@@ -18,6 +18,9 @@ solana-budget-api = { path = "../budget_api", version = "0.12.0" }
 solana-logger = { path = "../../logger", version = "0.12.0" }
 solana-sdk = { path = "../../sdk", version = "0.12.0" }
 
+[dev-dependencies]
+solana-runtime = { path = "../../runtime", version = "0.12.0" }
+
 [lib]
 name = "solana_budget_program"
 crate-type = ["cdylib"]

programs/budget/tests/budget.rs

@@ -0,0 +1,32 @@
+use solana_budget_api::budget_transaction::BudgetTransaction;
+use solana_runtime::bank::{Bank, Result};
+use solana_sdk::genesis_block::GenesisBlock;
+use solana_sdk::pubkey::Pubkey;
+use solana_sdk::signature::{Keypair, KeypairUtil};
+
+struct BudgetBank<'a> {
+    bank: &'a Bank,
+}
+
+impl<'a> BudgetBank<'a> {
+    fn new(bank: &'a Bank) -> Self {
+        bank.add_native_program("solana_budget_program", &solana_budget_api::id());
+        Self { bank }
+    }
+
+    fn pay(&self, from_keypair: &Keypair, to_id: Pubkey, lamports: u64) -> Result<()> {
+        let blockhash = self.bank.last_blockhash();
+        let tx = BudgetTransaction::new_payment(from_keypair, to_id, lamports, blockhash, 0);
+        self.bank.process_transaction(&tx)
+    }
+}
+
+#[test]
+fn test_budget_payment_via_bank() {
+    let (genesis_block, from_keypair) = GenesisBlock::new(10_000);
+    let bank = Bank::new(&genesis_block);
+    let budget_bank = BudgetBank::new(&bank);
+    let to_id = Keypair::new().pubkey();
+    budget_bank.pay(&from_keypair, to_id, 100).unwrap();
+    assert_eq!(bank.get_balance(&to_id), 100);
+}