program-test: Add large bootstrap stake for realistic warmups (#16739)

program-test/tests/warp.rs

@@ -1,5 +1,7 @@
 #![allow(clippy::integer_arithmetic)]
 use {
+    assert_matches::assert_matches,
+    bincode::deserialize,
     solana_program_test::{processor, ProgramTest, ProgramTestError},
     solana_sdk::{
         account_info::{next_account_info, AccountInfo},
@@ -11,12 +13,16 @@ use {
         rent::Rent,
         signature::{Keypair, Signer},
         system_instruction, system_program,
-        sysvar::{clock, Sysvar},
+        sysvar::{
+            clock,
+            stake_history::{self, StakeHistory},
+            Sysvar,
+        },
         transaction::{Transaction, TransactionError},
     },
     solana_stake_program::{
         stake_instruction,
-        stake_state::{Authorized, Lockup},
+        stake_state::{Authorized, Lockup, StakeState},
     },
     solana_vote_program::{
         vote_instruction,
@@ -248,4 +254,30 @@ async fn stake_rewards_from_warp() {
         .expect("account exists")
         .unwrap();
     assert!(account.lamports > stake_lamports);
+
+    // check that stake is fully active
+    let stake_history_account = context
+        .banks_client
+        .get_account(stake_history::id())
+        .await
+        .expect("account exists")
+        .unwrap();
+
+    let clock_account = context
+        .banks_client
+        .get_account(clock::id())
+        .await
+        .expect("account exists")
+        .unwrap();
+
+    let stake_state: StakeState = deserialize(&account.data).unwrap();
+    let stake_history: StakeHistory = deserialize(&stake_history_account.data).unwrap();
+    let clock: Clock = deserialize(&clock_account.data).unwrap();
+    let stake = stake_state.stake().unwrap();
+    assert_matches!(
+        stake
+            .delegation
+            .stake_activating_and_deactivating(clock.epoch, Some(&stake_history), true,),
+        (_, 0, 0)
+    );
 }