fixed gated error issue for test

Author: fpham0701

src/serialize.rs

@@ -408,4 +408,4 @@ pub mod tests {
         easycond.body = easycond.s(Stmt::Block(body));
         println!("{}", serialize_to_string(&easycond, &symbols).unwrap());
     }
-}
+}

src/typecheck.rs

@@ -146,6 +146,7 @@ pub fn type_check(tr: &Transaction, st: &SymbolTable, handler: &mut DiagnosticHa
     }
 }
 
+#[cfg(test)]
 mod tests {
     use crate::serialize::tests::{create_add_transaction, create_calyx_go_down_transaction};
     use baa::BitVecValue;