Move cumulus zombienet tests to aura & async backing (#3568)

Cumulus test-parachain node and test runtime were still using relay
chain consensus and 12s blocktimes. With async backing around the corner
on the major chains we should switch our tests too.

Also needed to nicely test the changes coming to collators in #3168.

### Changes Overview
- Followed the [migration
guide](https://wiki.polkadot.network/docs/maintain-guides-async-backing)
for async backing for the cumulus-test-runtime
- Adjusted the cumulus-test-service to use the correct import-queue,
lookahead collator etc.
- The block validation function now uses the Aura Ext Executor so that
the seal of the block is validated
- Previous point requires that we seal block before calling into
`validate_block`, I introduced a helper function for that
- Test client adjusted to provide a slot to the relay chain proof and
the aura pre-digest

cumulus/client/consensus/common/src/tests.rs

@@ -274,7 +274,7 @@ fn build_block<B: InitBlockBuilder>(
 	timestamp: Option<u64>,
 	relay_parent: Option<PHash>,
 ) -> Block {
-	let builder = match at {
+	let cumulus_test_client::BlockBuilderAndSupportData { block_builder, .. } = match at {
 		Some(at) => match timestamp {
 			Some(ts) => builder.init_block_builder_with_timestamp(at, None, sproof, ts),
 			None => builder.init_block_builder_at(at, None, sproof),
@@ -282,7 +282,7 @@ fn build_block<B: InitBlockBuilder>(
 		None => builder.init_block_builder(None, sproof),
 	};
 
-	let mut block = builder.build().unwrap().block;
+	let mut block = block_builder.build().unwrap().block;
 
 	if let Some(relay_parent) = relay_parent {
 		block
@@ -503,7 +503,7 @@ fn follow_finalized_does_not_stop_on_unknown_block() {
 
 	let unknown_block = {
 		let sproof = sproof_with_parent_by_hash(&client, block.hash());
-		let block_builder = client.init_block_builder_at(block.hash(), None, sproof);
+		let block_builder = client.init_block_builder_at(block.hash(), None, sproof).block_builder;
 		block_builder.build().unwrap().block
 	};
 
@@ -553,7 +553,7 @@ fn follow_new_best_sets_best_after_it_is_imported() {
 
 	let unknown_block = {
 		let sproof = sproof_with_parent_by_hash(&client, block.hash());
-		let block_builder = client.init_block_builder_at(block.hash(), None, sproof);
+		let block_builder = client.init_block_builder_at(block.hash(), None, sproof).block_builder;
 		block_builder.build().unwrap().block
 	};
 
@@ -665,8 +665,8 @@ fn do_not_set_best_block_to_older_block() {
 fn prune_blocks_on_level_overflow() {
 	// Here we are using the timestamp value to generate blocks with different hashes.
 	const LEVEL_LIMIT: usize = 3;
-	const TIMESTAMP_MULTIPLIER: u64 = 60000;
 
+	let mut ts_producer = std::iter::successors(Some(0), |&x| Some(x + 6000));
 	let backend = Arc::new(Backend::new_test(1000, 3));
 	let client = Arc::new(TestClientBuilder::with_backend(backend.clone()).build());
 	let mut para_import = ParachainBlockImport::new_with_limit(
@@ -675,13 +675,14 @@ fn prune_blocks_on_level_overflow() {
 		LevelLimit::Some(LEVEL_LIMIT),
 	);
 
+	let best_hash = client.chain_info().best_hash;
 	let block0 = build_and_import_block_ext(
 		&client,
 		BlockOrigin::NetworkInitialSync,
 		true,
 		&mut para_import,
-		None,
-		None,
+		Some(best_hash),
+		ts_producer.next(),
 		None,
 	);
 	let id0 = block0.header.hash();
@@ -694,7 +695,7 @@ fn prune_blocks_on_level_overflow() {
 				i == 1,
 				&mut para_import,
 				Some(id0),
-				Some(i as u64 * TIMESTAMP_MULTIPLIER),
+				ts_producer.next(),
 				None,
 			)
 		})
@@ -702,14 +703,14 @@ fn prune_blocks_on_level_overflow() {
 	let id10 = blocks1[0].header.hash();
 
 	let blocks2 = (0..2)
-		.map(|i| {
+		.map(|_| {
 			build_and_import_block_ext(
 				&client,
 				BlockOrigin::Own,
 				false,
 				&mut para_import,
 				Some(id10),
-				Some(i as u64 * TIMESTAMP_MULTIPLIER),
+				ts_producer.next(),
 				None,
 			)
 		})
@@ -738,7 +739,7 @@ fn prune_blocks_on_level_overflow() {
 		false,
 		&mut para_import,
 		Some(id0),
-		Some(LEVEL_LIMIT as u64 * TIMESTAMP_MULTIPLIER),
+		ts_producer.next(),
 		None,
 	);
 
@@ -758,7 +759,7 @@ fn prune_blocks_on_level_overflow() {
 		false,
 		&mut para_import,
 		Some(id0),
-		Some(2 * LEVEL_LIMIT as u64 * TIMESTAMP_MULTIPLIER),
+		ts_producer.next(),
 		None,
 	);
 
@@ -779,8 +780,8 @@ fn prune_blocks_on_level_overflow() {
 fn restore_limit_monitor() {
 	// Here we are using the timestamp value to generate blocks with different hashes.
 	const LEVEL_LIMIT: usize = 2;
-	const TIMESTAMP_MULTIPLIER: u64 = 60000;
-
+	// Iterator that produces a new timestamp in the next slot
+	let mut ts_producer = std::iter::successors(Some(0), |&x| Some(x + 6000));
 	let backend = Arc::new(Backend::new_test(1000, 3));
 	let client = Arc::new(TestClientBuilder::with_backend(backend.clone()).build());
 
@@ -791,13 +792,14 @@ fn restore_limit_monitor() {
 		LevelLimit::Some(usize::MAX),
 	);
 
+	let best_hash = client.chain_info().best_hash;
 	let block00 = build_and_import_block_ext(
 		&client,
 		BlockOrigin::NetworkInitialSync,
 		true,
 		&mut para_import,
-		None,
-		None,
+		Some(best_hash),
+		ts_producer.next(),
 		None,
 	);
 	let id00 = block00.header.hash();
@@ -810,26 +812,24 @@ fn restore_limit_monitor() {
 				i == 1,
 				&mut para_import,
 				Some(id00),
-				Some(i as u64 * TIMESTAMP_MULTIPLIER),
+				ts_producer.next(),
 				None,
 			)
 		})
 		.collect::<Vec<_>>();
 	let id10 = blocks1[0].header.hash();
 
-	let _ = (0..LEVEL_LIMIT)
-		.map(|i| {
-			build_and_import_block_ext(
-				&client,
-				BlockOrigin::Own,
-				false,
-				&mut para_import,
-				Some(id10),
-				Some(i as u64 * TIMESTAMP_MULTIPLIER),
-				None,
-			)
-		})
-		.collect::<Vec<_>>();
+	for _ in 0..LEVEL_LIMIT {
+		build_and_import_block_ext(
+			&client,
+			BlockOrigin::Own,
+			false,
+			&mut para_import,
+			Some(id10),
+			ts_producer.next(),
+			None,
+		);
+	}
 
 	// Scenario before limit application (with B11 imported as best)
 	// Import order (freshness): B00, B10, B11, B12, B20, B21
@@ -860,7 +860,7 @@ fn restore_limit_monitor() {
 		false,
 		&mut para_import,
 		Some(id00),
-		Some(LEVEL_LIMIT as u64 * TIMESTAMP_MULTIPLIER),
+		ts_producer.next(),
 		None,
 	);