Add convenience function for programs to get minimum delegation (#24175)

programs/bpf/tests/programs.rs

@@ -56,6 +56,7 @@ use {
         pubkey::Pubkey,
         rent::Rent,
         signature::{keypair_from_seed, Keypair, Signer},
+        stake,
         system_instruction::{self, MAX_PERMITTED_DATA_LENGTH},
         system_program,
         sysvar::{self, clock, rent},
@@ -3522,3 +3523,32 @@ fn test_program_fees() {
     let post_balance = bank_client.get_balance(&mint_keypair.pubkey()).unwrap();
     assert_eq!(pre_balance - post_balance, expected_min_fee);
 }
+
+#[test]
+#[cfg(feature = "bpf_rust")]
+fn test_get_minimum_delegation() {
+    let GenesisConfigInfo {
+        genesis_config,
+        mint_keypair,
+        ..
+    } = create_genesis_config(100_123_456_789);
+    let mut bank = Bank::new_for_tests(&genesis_config);
+    bank.feature_set = Arc::new(FeatureSet::all_enabled());
+
+    let (name, id, entrypoint) = solana_bpf_loader_program!();
+    bank.add_builtin(&name, &id, entrypoint);
+    let bank = Arc::new(bank);
+    let bank_client = BankClient::new_shared(&bank);
+
+    let program_id = load_bpf_program(
+        &bank_client,
+        &bpf_loader::id(),
+        &mint_keypair,
+        "solana_bpf_rust_get_minimum_delegation",
+    );
+
+    let account_metas = vec![AccountMeta::new_readonly(stake::program::id(), false)];
+    let instruction = Instruction::new_with_bytes(program_id, &[], account_metas);
+    let result = bank_client.send_and_confirm_instruction(&mint_keypair, instruction);
+    assert!(result.is_ok());
+}