add solana_name_id, reassociate names with modules, modularize id tests (#4580)

sdk/src/syscall/current.rs

@@ -0,0 +1,50 @@
+//! This account contains the current slot, epoch, and stakers_epoch
+//!
+use crate::account::Account;
+use crate::syscall;
+use bincode::serialized_size;
+
+crate::solana_name_id!(ID, "Sysca11Current11111111111111111111111111111");
+
+const ID: [u8; 32] = [
+    6, 167, 211, 138, 69, 218, 14, 184, 34, 50, 188, 33, 201, 49, 63, 13, 15, 193, 33, 132, 208,
+    238, 129, 224, 101, 67, 14, 11, 160, 0, 0, 0,
+];
+
+#[repr(C)]
+#[derive(Serialize, Deserialize, Debug, Default, PartialEq)]
+pub struct Current {
+    slot: u64,
+    block: u64,
+    epoch: u64,
+    stakers_epoch: u64,
+}
+
+impl Current {
+    pub fn from(account: &Account) -> Option<Self> {
+        account.deserialize_data().ok()
+    }
+    pub fn to(&self, account: &mut Account) -> Option<()> {
+        account.serialize_data(self).ok()
+    }
+
+    pub fn size_of() -> usize {
+        serialized_size(&Self::default()).unwrap() as usize
+    }
+}
+
+pub fn create_account(lamports: u64) -> Account {
+    Account::new(lamports, Current::size_of(), &syscall::id())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_create_account() {
+        let account = create_account(1);
+        let current = Current::from(&account).unwrap();
+        assert_eq!(current, Current::default());
+    }
+}