substrate 编译出错unresolved import `sp_runtime::testing` failed to resolve: could not find `GenesisConfig` in `system`

 error[E0432]: unresolved import `sp_runtime::testing`
   --> /Users/suyinrong/bitcoin-proj/substrate-course/substrate-node-template/pallets/poe/src/mock.rs:5:41
    |
  5 |     traits::{BlakeTwo256, IdentityLookup}, testing::Header, Perbill,
    |                                            ^^^^^^^ could not find `testing` in `sp_runtime`

  error[E0433]: failed to resolve: could not find `GenesisConfig` in `system`
    --> /Users/suyinrong/bitcoin-proj/substrate-course/substrate-node-template/pallets/poe/src/mock.rs:66:10
     |
  66 |     system::GenesisConfig::default().build_storage::<Test>().unwrap().into()
     |             ^^^^^^^^^^^^^ could not find `GenesisConfig` in `system`

  error[E0412]: cannot find type `Box` in this scope
    --> /Users/suyinrong/bitcoin-proj/substrate-course/substrate-node-template/pallets/poe/src/mock.rs:10:1
     |
  10 | / impl_outer_origin! {
  11 | |     pub enum Origin for Test {}
  12 | | }
     | |_^ not found in this scope
     |
     = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
  help: consider importing one of these items
     |
  1  | use crate::Box;
     |
  1  | use frame_support::traits::Box;
     |
  1  | use sp_std::boxed::Box;
     |

  error[E0433]: failed to resolve: use of undeclared type `Box`
    --> /Users/suyinrong/bitcoin-proj/substrate-course/substrate-node-template/pallets/poe/src/mock.rs:10:1
     |
  10 | / impl_outer_origin! {
  11 | |     pub enum Origin for Test {}
  12 | | }
     | |_^ not found in this scope
     |
     = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
  help: consider importing one of these items
     |
  1  | use crate::Box;
     |
  1  | use frame_support::traits::Box;
     |
  1  | use sp_std::boxed::Box;
     |

  error[E0433]: failed to resolve: use of undeclared type `Box`
    --> /Users/suyinrong/bitcoin-proj/substrate-course/substrate-node-template/pallets/poe/src/mock.rs:10:1
     |
  10 | / impl_outer_origin! {
  11 | |     pub enum Origin for Test {}
  12 | | }
     | |_^ not found in this scope
     |
     = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
  help: consider importing one of these items
     |
  1  | use crate::Box;
     |
  1  | use frame_support::traits::Box;
     |
  1  | use sp_std::boxed::Box;
     |

  error[E0433]: failed to resolve: use of undeclared type `Box`
    --> /Users/suyinrong/bitcoin-proj/substrate-course/substrate-node-template/pallets/poe/src/mock.rs:10:1
     |
  10 | / impl_outer_origin! {
  11 | |     pub enum Origin for Test {}
  12 | | }
     | |_^ not found in this scope
     |
     = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
  help: consider importing one of these items
     |
  1  | use crate::Box;
     |
  1  | use frame_support::traits::Box;
     |
  1  | use sp_std::boxed::Box;
     |

  error[E0412]: cannot find type `TestExternalities` in crate `sp_io`
    --> /Users/suyinrong/bitcoin-proj/substrate-course/substrate-node-template/pallets/poe/src/mock.rs:65:33
     |
  65 | pub fn new_test_ext() -> sp_io::TestExternalities {
     |                                 ^^^^^^^^^^^^^^^^^ not found in `sp_io`

  error: aborting due to 7 previous errors

  Some errors have detailed explanations: E0412, E0432, E0433.
  For more information about an error, try `rustc --explain E0412`.
  error: could not compile `pallet-poe`

  To learn more, run the command again with --verbose.

遇见此类错误信息是因为，在你的测试mod上面需要加上#[cfg(test)]

例如我这里就是在mod mork上没有添加此类设置报错。