测试只有在lib中能够使用(cargo root lib)

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//mylib/src/animal.rs
pub mod Dog {
    pub fn hello () {
        println!("wangwang");
      }
    pub fn is_dog() -> bool {
        true
      }
  }
pub mod Cat {
    pub fn hello () {
        println!("miaomiao");
      }
    pub is_cat() -> bool {
        true
      }
  }
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//mylib/src/lib.rs
pub mod animal;

#[cfg(test)]
mod tests {
  use crate::animal::Cat;

  #[test]
  fn it_works() {
      assert_eq(2+2,4);
    }
  }
  #[test]
  fn use_cat () {
      //cat::hello();
      assert_eq!(true,Cat::is_cat());
    }
  #[test]
  fn use_dog() {
      assert_eq!(true,animal::Dog::is_dog());
    }