dev: add tests to test more cases of eth_chain_id

crates/contracts/src/kakarot_core/eth_rpc.cairo

@@ -218,22 +218,50 @@ fn is_view(self: @KakarotCore::ContractState) -> bool {
 mod tests {
     use contracts::kakarot_core::KakarotCore;
     use contracts::kakarot_core::eth_rpc::IEthRPC;
-    use snforge_std::{start_cheat_chain_id_global};
+    use snforge_std::{start_cheat_chain_id_global, stop_cheat_chain_id_global};
+    use utils::constants::POW_2_53;
 
     fn set_up() -> KakarotCore::ContractState {
         // Define the kakarot state to access contract functions
         let kakarot_state = KakarotCore::unsafe_new_contract_state();
 
-        // Set up environment
-        start_cheat_chain_id_global(1);
-
         kakarot_state
     }
 
+    fn tear_down() {
+        stop_cheat_chain_id_global();
+    }
+
 
     #[test]
-    fn test_eth_chain_id() {
+    fn test_eth_chain_id_returns_input_when_less_than_pow_2_53() {
+        let kakarot_state = KakarotCore::unsafe_new_contract_state();
+        // Convert POW_2_53 - 1 to u64 since POW_2_53 is defined as u128
+        let chain_id: u64 = (POW_2_53 - 1).try_into().unwrap();
+        start_cheat_chain_id_global(chain_id.into());
+        assert_eq!(
+            kakarot_state.eth_chain_id(),
+            chain_id,
+            "Should return original chain ID when below 2^53"
+        );
+        tear_down();
+    }
+
+    #[test]
+    fn test_eth_chain_id_returns_modulo_when_greater_than_or_equal_to_pow_2_53() {
+        // Test with a value equal to 2^53
         let kakarot_state = set_up();
-        assert_eq!(kakarot_state.eth_chain_id(), 1);
+        let chain_id: u64 = POW_2_53.try_into().unwrap();
+        start_cheat_chain_id_global(chain_id.into());
+        assert_eq!(kakarot_state.eth_chain_id(), 0, "Should return 0 when chain ID is 2^53");
+
+        // Test with a value greater than 2^53
+        let chain_id: u64 = (POW_2_53 + 53).try_into().unwrap();
+        start_cheat_chain_id_global(chain_id.into());
+        assert_eq!(
+            kakarot_state.eth_chain_id(), 53, "Should return correct value after modulo operation"
+        );
+        tear_down();
     }
 }
+