Exchange pallet benchmarks (#158)

* exchange benchmarks: framework

* updated comment about tx size

Co-authored-by: Tomasz Drwięga <tomasz@parity.io>

bridges/modules/ethereum/src/benchmarking.rs

@@ -48,7 +48,6 @@ benchmarks! {
 				header
 			},
 		);
-
 	}: import_unsigned_header(RawOrigin::None, header, None)
 	verify {
 		let storage = BridgeStorage::<T>::new();

bridges/modules/ethereum/src/lib.rs

@@ -44,7 +44,7 @@ mod benchmarking;
 mod mock;
 
 #[cfg(any(feature = "runtime-benchmarks", test))]
-mod test_utils;
+pub mod test_utils;
 
 /// Maximal number of blocks we're pruning in single import call.
 const MAX_BLOCKS_TO_PRUNE_IN_SINGLE_IMPORT: u64 = 8;
@@ -547,7 +547,7 @@ impl<T: Trait> frame_support::unsigned::ValidateUnsigned for Module<T> {
 
 /// Runtime bridge storage.
 #[derive(Default)]
-struct BridgeStorage<T>(sp_std::marker::PhantomData<T>);
+pub struct BridgeStorage<T>(sp_std::marker::PhantomData<T>);
 
 impl<T: Trait> BridgeStorage<T> {
 	/// Create new BridgeStorage.

bridges/modules/ethereum/src/test_utils.rs

@@ -27,7 +27,7 @@
 use crate::finality::FinalityVotes;
 use crate::validators::CHANGE_EVENT_HASH;
 use crate::verification::calculate_score;
-use crate::{HeaderToImport, Storage};
+use crate::{HeaderToImport, Storage, Trait};
 
 use primitives::{
 	rlp_encode,
@@ -60,25 +60,34 @@ impl HeaderBuilder {
 		}
 	}
 
-	/// Creates default header on top of parent with given hash.
+	/// Creates default header on top of test parent with given hash.
 	#[cfg(test)]
 	pub fn with_parent_hash(parent_hash: H256) -> Self {
-		use crate::mock::TestRuntime;
+		Self::with_parent_hash_on_runtime::<crate::mock::TestRuntime>(parent_hash)
+	}
+
+	/// Creates default header on top of test parent with given number. First parent is selected.
+	#[cfg(test)]
+	pub fn with_parent_number(parent_number: u64) -> Self {
+		Self::with_parent_number_on_runtime::<crate::mock::TestRuntime>(parent_number)
+	}
+
+	/// Creates default header on top of parent with given hash.
+	pub fn with_parent_hash_on_runtime<T: Trait>(parent_hash: H256) -> Self {
 		use crate::Headers;
 		use frame_support::StorageMap;
 
-		let parent_header = Headers::<TestRuntime>::get(&parent_hash).unwrap().header;
+		let parent_header = Headers::<T>::get(&parent_hash).unwrap().header;
 		Self::with_parent(&parent_header)
 	}
 
 	/// Creates default header on top of parent with given number. First parent is selected.
-	#[cfg(test)]
-	pub fn with_parent_number(parent_number: u64) -> Self {
+	pub fn with_parent_number_on_runtime<T: Trait>(parent_number: u64) -> Self {
 		use crate::HeadersByNumber;
 		use frame_support::StorageMap;
 
 		let parent_hash = HeadersByNumber::get(parent_number).unwrap()[0].clone();
-		Self::with_parent_hash(parent_hash)
+		Self::with_parent_hash_on_runtime::<T>(parent_hash)
 	}
 
 	/// Creates default header on top of non-existent parent.
@@ -185,6 +194,12 @@ impl HeaderBuilder {
 		self
 	}
 
+	/// Update transactions root field of this header.
+	pub fn with_transactions_root(mut self, transactions_root: H256) -> Self {
+		self.header.transactions_root = transactions_root;
+		self
+	}
+
 	/// Signs header by given author.
 	pub fn sign_by(self, author: &SecretKey) -> Header {
 		self.header.sign_by(author)