Adding method to interface and test it

crates/contracts/src/kakarot_core/eth_rpc.cairo

@@ -222,8 +222,11 @@ fn is_view(self: @KakarotCore::ContractState) -> bool {
 mod tests {
     use crate::kakarot_core::KakarotCore;
     use crate::kakarot_core::eth_rpc::IEthRPC;
+    use crate::kakarot_core::interface::IExtendedKakarotCoreDispatcherTrait;
+    use crate::test_utils::{setup_contracts_for_testing, deploy_eoa};
     use snforge_std::{start_cheat_chain_id_global, stop_cheat_chain_id_global};
     use utils::constants::POW_2_53;
+    use evm::test_utils::evm_address;
 
     fn set_up() -> KakarotCore::ContractState {
         // Define the kakarot state to access contract functions
@@ -236,6 +239,14 @@ mod tests {
         stop_cheat_chain_id_global();
     }
 
+    #[test]
+    fn test_eth_get_transaction_count() {
+        let (_, kakarot_core) = setup_contracts_for_testing();
+        let _ = deploy_eoa(kakarot_core, evm_address());
+        // Deployed eoa should return a zero nonce
+        assert_eq!(kakarot_core.eth_get_transaction_count(evm_address()), 0);
+    }
+
 
     #[test]
     fn test_eth_chain_id_returns_input_when_less_than_pow_2_53() {

crates/contracts/src/kakarot_core/interface.cairo

@@ -85,6 +85,9 @@ pub trait IExtendedKakarotCore<TContractState> {
     /// Executes an EVM transaction and possibly modifies the state
     fn eth_send_transaction(ref self: TContractState, tx: Transaction) -> (bool, Span<u8>, u64);
 
+    // Returns the transaction count (nonce) of the specified address
+    fn eth_get_transaction_count(self: @TContractState, address: EthAddress) -> u64;
+
     /// Upgrade the KakarotCore smart contract
     /// Using replace_class_syscall
     fn upgrade(ref self: TContractState, new_class_hash: ClassHash);