dev: Decouple test environment from .env file (kkrt-labs#886)

* Generate test RPCConfig via hardcoded socket address

* add cfg

src/eth_rpc/config.rs

@@ -24,4 +24,21 @@ impl RPCConfig {
         }
         Ok(config)
     }
+
+    #[cfg(feature = "testing")]
+    pub fn new_test_config() -> Self {
+        // Hardcode the socket address for testing environment
+        Self::new("127.0.0.1:3030".to_string())
+    }
+
+    #[cfg(feature = "testing")]
+    pub fn new_test_config_from_port(port: u16) -> Self {
+        let mut config = Self::new_test_config();
+        // Remove port from socket address and replace it with provided port
+        let parts: Vec<&str> = config.socket_addr.split(':').collect();
+        if let Some(addr) = parts.first() {
+            config.socket_addr = format!("{}:{}", addr, port);
+        }
+        config
+    }
 }

src/test_utils/rpc/mod.rs

@@ -80,7 +80,10 @@ async fn get_next_port() -> u16 {
 pub async fn start_kakarot_rpc_server(katana: &Katana) -> Result<(SocketAddr, ServerHandle), eyre::Report> {
     Ok(run_server(
         KakarotRpcModuleBuilder::new(katana.eth_provider()).rpc_module()?,
-        RPCConfig::from_port(get_next_port().await)?,
+        #[cfg(feature = "testing")]
+        RPCConfig::new_test_config_from_port(get_next_port().await),
+        #[cfg(not(feature = "testing"))]
+        RPCConfig::from_port(get_next_port().await),
     )
     .await?)
 }