Reduce the execution time of some tests (#10377)

* Reduce the execution time of some tests

* Fix

* Fix build

* fmt

substrate/frame/staking/src/lib.rs

@@ -301,7 +301,7 @@ mod pallet;
 
 use codec::{Decode, Encode, HasCompact};
 use frame_support::{
-	traits::{Currency, Get},
+	traits::{ConstU32, Currency, Get},
 	weights::Weight,
 };
 use scale_info::TypeInfo;
@@ -807,3 +807,23 @@ where
 		R::is_known_offence(offenders, time_slot)
 	}
 }
+
+/// Configurations of the benchmarking of the pallet.
+pub trait BenchmarkingConfig {
+	/// The maximum number of validators to use.
+	type MaxValidators: Get<u32>;
+	/// The maximum number of nominators to use.
+	type MaxNominators: Get<u32>;
+}
+
+/// A mock benchmarking config for pallet-staking.
+///
+/// Should only be used for testing.
+#[cfg(feature = "std")]
+pub struct TestBenchmarkingConfig;
+
+#[cfg(feature = "std")]
+impl BenchmarkingConfig for TestBenchmarkingConfig {
+	type MaxValidators = ConstU32<100>;
+	type MaxNominators = ConstU32<100>;
+}