solana_program/sysvar/
stake_history.rs

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//! named accounts for synthesized data accounts for bank state, etc.
//!
//! this account carries history about stake activations and de-activations
//!
pub use crate::stake_history::StakeHistory;
use crate::sysvar::Sysvar;

crate::declare_sysvar_id!("SysvarStakeHistory1111111111111111111111111", StakeHistory);

impl Sysvar for StakeHistory {
    // override
    fn size_of() -> usize {
        // hard-coded so that we don't have to construct an empty
        16392 // golden, update if MAX_ENTRIES changes
    }
}

#[cfg(test)]
mod tests {
    use {super::*, crate::stake_history::*};

    #[test]
    fn test_size_of() {
        let mut stake_history = StakeHistory::default();
        for i in 0..MAX_ENTRIES as u64 {
            stake_history.add(
                i,
                StakeHistoryEntry {
                    activating: i,
                    ..StakeHistoryEntry::default()
                },
            );
        }

        assert_eq!(
            bincode::serialized_size(&stake_history).unwrap() as usize,
            StakeHistory::size_of()
        );
    }

    #[test]
    fn test_create_account() {
        let mut stake_history = StakeHistory::default();
        for i in 0..MAX_ENTRIES as u64 + 1 {
            stake_history.add(
                i,
                StakeHistoryEntry {
                    activating: i,
                    ..StakeHistoryEntry::default()
                },
            );
        }
        assert_eq!(stake_history.len(), MAX_ENTRIES);
        assert_eq!(stake_history.iter().map(|entry| entry.0).min().unwrap(), 1);
        assert_eq!(stake_history.get(0), None);
        assert_eq!(
            stake_history.get(1),
            Some(&StakeHistoryEntry {
                activating: 1,
                ..StakeHistoryEntry::default()
            })
        );
    }
}