Test each benchmark case in own #[test] (#9860)

* Generate one #[test] fn per bench case.

* Update benchmark macro syntax in frame pallets.

* Explain new benchmark macro syntax in example pallet.

* support with and without a semicolon

* update pallets to use individual tests

* migrate staking too

* migrate more pallets

* fix up democracy and use individual tests

* Fix comment

* Put println message in panic

* Remove `another_set_dummy` from doc

`another_set_dummy` is not present in the benchmarking.rs (anymore).

* Update doc for benchmarks macro

* Update doc for impl_benchmark_test_suite macro

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>

substrate/frame/democracy/src/benchmarking.rs

@@ -19,7 +19,7 @@
 
 use super::*;
 
-use frame_benchmarking::{account, benchmarks, impl_benchmark_test_suite, whitelist_account};
+use frame_benchmarking::{account, benchmarks, whitelist_account};
 use frame_support::{
 	assert_noop, assert_ok,
 	codec::Decode,
@@ -70,7 +70,7 @@ fn add_referendum<T: Config>(n: u32) -> Result<ReferendumIndex, &'static str> {
 	let referendum_index: ReferendumIndex = ReferendumCount::<T>::get() - 1;
 	T::Scheduler::schedule_named(
 		(DEMOCRACY_ID, referendum_index).encode(),
-		DispatchTime::At(1u32.into()),
+		DispatchTime::At(2u32.into()),
 		None,
 		63,
 		frame_system::RawOrigin::Root.into(),
@@ -802,6 +802,10 @@ benchmarks! {
 			Err(Error::<T>::PreimageInvalid.into())
 		);
 	}
-}
 
-impl_benchmark_test_suite!(Democracy, crate::tests::new_test_ext(), crate::tests::Test);
+	impl_benchmark_test_suite!(
+		Democracy,
+		crate::tests::new_test_ext(),
+		crate::tests::Test
+	);
+}

substrate/frame/democracy/src/lib.rs

@@ -149,7 +149,7 @@
 //! - `cancel_queued` - Cancels a proposal that is queued for enactment.
 //! - `clear_public_proposal` - Removes all public proposals.
 
-#![recursion_limit = "128"]
+#![recursion_limit = "256"]
 #![cfg_attr(not(feature = "std"), no_std)]
 
 use codec::{Decode, Encode, Input};