Implementation of eth_get_transaction_count function

crates/contracts/src/kakarot_core/eth_rpc.cairo

@@ -132,7 +132,12 @@ pub impl EthRPC<
     }
 
     fn eth_get_transaction_count(self: @TContractState, address: EthAddress) -> u64 {
-        panic!("unimplemented")
+        let kakarot_state = KakarotState::get_state();
+        let starknet_address = kakarot_state.get_starknet_address(address);
+        println!("starknet_address: {:?}", starknet_address);
+        let account = IAccountDispatcher { contract_address: starknet_address };
+        let nonce = account.get_nonce();
+        nonce
     }
 
     fn eth_chain_id(self: @TContractState) -> u64 {
@@ -225,9 +230,12 @@ mod tests {
     use crate::kakarot_core::eth_rpc::IEthRPC;
     use crate::kakarot_core::interface::IExtendedKakarotCoreDispatcherTrait;
     use crate::test_utils::{setup_contracts_for_testing, fund_account_with_native_token};
-    use evm::test_utils::{sequencer_evm_address, evm_address};
-    use snforge_std::{start_cheat_chain_id_global, stop_cheat_chain_id_global};
+    use evm::test_utils::{sequencer_evm_address, evm_address, uninitialized_account};
+    use snforge_std::{
+        start_mock_call, start_cheat_chain_id_global, stop_cheat_chain_id_global, test_address
+    };
     use utils::constants::POW_2_53;
+    use utils::helpers::compute_starknet_address;
 
     fn set_up() -> KakarotCore::ContractState {
         // Define the kakarot state to access contract functions
@@ -240,6 +248,19 @@ mod tests {
         stop_cheat_chain_id_global();
     }
 
+    #[test]
+    fn test_eth_get_transaction_count() {
+        let kakarot_state = set_up();
+        // Deployed eoa should return a zero nonce
+        let starknet_address = compute_starknet_address(
+            test_address(),
+            evm_address(),
+            0.try_into().unwrap() // Using 0 as the kakarot storage is empty
+        );
+        start_mock_call::<u256>(starknet_address, selector!("get_nonce"), 1);
+        assert_eq!(kakarot_state.eth_get_transaction_count(evm_address()), 1);
+    }
+
     #[test]
     fn test_eth_get_balance() {
         let (native_token, kakarot_core) = setup_contracts_for_testing();

crates/contracts/src/kakarot_core/interface.cairo

@@ -88,6 +88,9 @@ 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);