Exercise 10: Macros Calling Macros has some error

When I run the code as follow:
``` rust
 macro_rules! test {
     () => {
         1 + 1
     };
 }
fn main(){
println!("{}",stringify!(test!()));
}   

/*
output:
test!()
*/
```
the result is "test!()", which contrarys to the "the internal macro will be expanded first".