From 83a50952be82965e1b554e854f11668941f5912d Mon Sep 17 00:00:00 2001
From: lemunozm <lemunozm@gmail.com>
Date: Thu, 26 Oct 2023 19:31:11 +0200
Subject: [PATCH] Support jumping to future blocks

---
 .../src/generic/cases/example.rs              | 17 ++++++-
 runtime/integration-tests/src/generic/env.rs  | 50 +++++++++++++------
 .../src/generic/envs/fudge_env.rs             |  6 ++-
 3 files changed, 57 insertions(+), 16 deletions(-)

diff --git a/runtime/integration-tests/src/generic/cases/example.rs b/runtime/integration-tests/src/generic/cases/example.rs
index 694e94a25a..6e4bd4310a 100644
--- a/runtime/integration-tests/src/generic/cases/example.rs
+++ b/runtime/integration-tests/src/generic/cases/example.rs
@@ -1,4 +1,5 @@
-use cfg_primitives::{Balance, CFG};
+use cfg_primitives::{Balance, CFG, SECONDS_PER_YEAR};
+use cfg_traits::IntoSeconds;
 use frame_support::traits::Get;
 use sp_api::runtime_decl_for_Core::CoreV4;
 
@@ -156,7 +157,21 @@ fn fudge_call_api<T: Runtime + FudgeSupport>() {
 	})
 }
 
+fn pass_time_one_block<T: Runtime>() {
+	let mut env = RuntimeEnv::<T>::from_storage(Default::default());
+
+	let before = env.state(|| pallet_timestamp::Pallet::<T>::get());
+
+	// Not supported in fudge
+	env.pass(Blocks::JumpBySeconds(SECONDS_PER_YEAR));
+
+	let after = env.state(|| pallet_timestamp::Pallet::<T>::get());
+
+	assert_eq!((after - before).into_seconds(), SECONDS_PER_YEAR)
+}
+
 crate::test_for_runtimes!([development, altair, centrifuge], transfer_balance);
 crate::test_for_runtimes!(all, call_api);
 crate::test_for_runtimes!(all, fudge_transfer_balance);
 crate::test_for_runtimes!(all, fudge_call_api);
+crate::test_for_runtimes!(all, pass_time_one_block);
diff --git a/runtime/integration-tests/src/generic/env.rs b/runtime/integration-tests/src/generic/env.rs
index d8dd5a48e4..1d37a6b0aa 100644
--- a/runtime/integration-tests/src/generic/env.rs
+++ b/runtime/integration-tests/src/generic/env.rs
@@ -24,26 +24,37 @@ pub enum Blocks<Event> {
 
 	/// Pass a number of block until find an event or reach the limit
 	UntilEvent { event: Event, limit: BlockNumber },
+
+	/// Jumps to a block in the future to reach the requested time.
+	/// Only one real block is created in the process.
+	/// This can be used to emulate passing time during long periods
+	/// computationally very fast.
+	/// (i.e. years)
+	JumpBySeconds(Seconds),
 }
 
 impl<Event> Blocks<Event> {
 	fn range_for(&self, current: BlockNumber, slot_duration: Seconds) -> Range<BlockNumber> {
-		let blocks = match self {
-			Blocks::ByNumber(n) => *n,
+		let next = current + 1;
+		let (from, to) = match self {
+			Blocks::ByNumber(n) => (next, next + *n),
 			Blocks::BySeconds(secs) => {
-				let n = secs / slot_duration;
+				let mut blocks = (secs / slot_duration) as BlockNumber;
 				if secs % slot_duration != 0 {
-					n as BlockNumber + 1
-				} else {
-					n as BlockNumber
-				}
+					blocks += 1
+				};
+				(next, next + blocks)
+			}
+			Blocks::UntilEvent { limit, .. } => (next, next + *limit),
+			Blocks::JumpBySeconds(secs) => {
+				let mut blocks = (secs / slot_duration) as BlockNumber;
+				if secs % slot_duration != 0 {
+					blocks += 1
+				};
+				(next + blocks.saturating_sub(1), next + blocks)
 			}
-			Blocks::UntilEvent { limit, .. } => *limit,
 		};
-
-		dbg!(blocks);
-
-		(current + 1)..(current + 1 + blocks)
+		from..to
 	}
 }
 
@@ -162,6 +173,7 @@ mod tests {
 	struct MockEnv;
 
 	const SLOT_DURATION: Seconds = 12;
+	const EMPTY: [BlockNumber; 0] = [];
 
 	fn blocks_from(current: BlockNumber, blocks: Blocks<()>) -> Vec<BlockNumber> {
 		blocks
@@ -172,11 +184,21 @@ mod tests {
 
 	#[test]
 	fn by_seconds() {
-		assert_eq!(blocks_from(0, Blocks::BySeconds(0)), [] as [BlockNumber; 0]);
+		assert_eq!(blocks_from(0, Blocks::BySeconds(0)), EMPTY);
 		assert_eq!(blocks_from(0, Blocks::BySeconds(1)), [1]);
 		assert_eq!(blocks_from(0, Blocks::BySeconds(12)), [1]);
-		assert_eq!(blocks_from(5, Blocks::BySeconds(0)), [] as [BlockNumber; 0]);
+		assert_eq!(blocks_from(5, Blocks::BySeconds(0)), EMPTY);
 		assert_eq!(blocks_from(5, Blocks::BySeconds(12)), [6]);
 		assert_eq!(blocks_from(5, Blocks::BySeconds(60)), [6, 7, 8, 9, 10]);
 	}
+
+	#[test]
+	fn by_seconds_fast() {
+		assert_eq!(blocks_from(0, Blocks::JumpBySeconds(0)), EMPTY);
+		assert_eq!(blocks_from(0, Blocks::JumpBySeconds(1)), [1]);
+		assert_eq!(blocks_from(0, Blocks::JumpBySeconds(12)), [1]);
+		assert_eq!(blocks_from(5, Blocks::JumpBySeconds(0)), EMPTY);
+		assert_eq!(blocks_from(5, Blocks::JumpBySeconds(12)), [6]);
+		assert_eq!(blocks_from(5, Blocks::JumpBySeconds(60)), [10]);
+	}
 }
diff --git a/runtime/integration-tests/src/generic/envs/fudge_env.rs b/runtime/integration-tests/src/generic/envs/fudge_env.rs
index e30c1936d6..76db6147c1 100644
--- a/runtime/integration-tests/src/generic/envs/fudge_env.rs
+++ b/runtime/integration-tests/src/generic/envs/fudge_env.rs
@@ -76,7 +76,11 @@ impl<T: Runtime + FudgeSupport> Env<T> for FudgeEnv<T> {
 		self.handle.parachain().with_state(f).unwrap()
 	}
 
-	fn __priv_build_block(&mut self, _i: BlockNumber) {
+	fn __priv_build_block(&mut self, i: BlockNumber) {
+		let current = self.state(|| frame_system::Pallet::<T>::block_number());
+		if i > current + 1 {
+			panic!("Jump to future blocks is unsupported in fudge (maybe you've used Blocks::BySecondsFast?)");
+		}
 		self.handle.evolve();
 	}
 }