add test

Signed-off-by: salaheldinsoliman <salaheldin_sameh@aucegypt.edu>

Author: salaheldinsoliman

tests/soroban_testcases/cross_contract_calls.rs

@@ -47,6 +47,6 @@ fn simple_cross_contract() {
     let res = runtime.invoke_contract(&caller, "call_max", vec![addr.into_val(&runtime.env), arg, arg2]);
 
     println!("second res {:?}", res);
-    //assert!(expected.shallow_eq(&res));
+    assert!(expected.shallow_eq(&res));
 
 }