Move new_move_many to SystemInstruction

sdk/src/system_instruction.rs

@@ -82,4 +82,35 @@ impl SystemInstruction {
             account_metas,
         )
     }
+
+    /// Create and sign new SystemInstruction::Move transaction to many destinations
+    pub fn new_move_many(from_id: &Pubkey, to_lamports: &[(Pubkey, u64)]) -> Vec<Instruction> {
+        to_lamports
+            .iter()
+            .map(|(to_id, lamports)| SystemInstruction::new_move(from_id, to_id, *lamports))
+            .collect()
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::signature::{Keypair, KeypairUtil};
+
+    fn get_keys(instruction: &Instruction) -> Vec<Pubkey> {
+        instruction.accounts.iter().map(|x| x.pubkey).collect()
+    }
+
+    #[test]
+    fn test_move_many() {
+        let alice_pubkey = Keypair::new().pubkey();
+        let bob_pubkey = Keypair::new().pubkey();
+        let carol_pubkey = Keypair::new().pubkey();
+        let to_lamports = vec![(bob_pubkey, 1), (carol_pubkey, 2)];
+
+        let instructions = SystemInstruction::new_move_many(&alice_pubkey, &to_lamports);
+        assert_eq!(instructions.len(), 2);
+        assert_eq!(get_keys(&instructions[0]), vec![alice_pubkey, bob_pubkey]);
+        assert_eq!(get_keys(&instructions[1]), vec![alice_pubkey, carol_pubkey]);
+    }
 }