tests for difficulty adjustment scenarios (#887)

* tests for difficulty adjustment scenarios

* ignore test

chain/tests/mine_simple_chain.rs

@@ -433,3 +433,33 @@ fn prepare_block_nosum(
 	b.header.pow = core::core::Proof::random(proof_size);
 	b
 }
+
+#[test]
+#[ignore]
+fn actual_diff_iter_output() {
+	global::set_mining_mode(ChainTypes::AutomatedTesting);
+	let genesis_block = pow::mine_genesis_block(None).unwrap();
+	let chain = chain::Chain::init(
+		"../.grin".to_string(),
+		Arc::new(NoopAdapter {}),
+		genesis_block,
+		pow::verify_size,
+	).unwrap();
+	let iter = chain.difficulty_iter();
+	let mut last_time = 0;
+	let mut first = true;
+	for i in iter.into_iter() {
+		let elem = i.unwrap();
+		if first {
+			last_time = elem.0;
+			first = false;
+		}
+		println!(
+			"next_difficulty time: {}, diff: {}, duration: {} ",
+			elem.0,
+			elem.1.into_num(),
+			last_time - elem.0
+		);
+		last_time = elem.0;
+	}
+}

core/tests/consensus.rs

@@ -64,6 +64,18 @@ fn add_block(
 	return_chain
 }
 
+// Adds many defined blocks
+fn add_blocks(
+	intervals: Vec<u64>,
+	chain_sim: Vec<Result<(u64, Difficulty), TargetError>>,
+) -> Vec<Result<(u64, Difficulty), TargetError>> {
+	let mut return_chain = chain_sim.clone();
+	for i in intervals {
+		return_chain = add_block(i, return_chain.clone());
+	}
+	return_chain
+}
+
 // Adds another n 'blocks' to the iterator, with difficulty calculated
 fn add_block_repeated(
 	interval: u64,
@@ -83,8 +95,13 @@ fn print_chain_sim(chain_sim: &Vec<Result<(u64, Difficulty), TargetError>>) {
 	let mut chain_sim = chain_sim.clone();
 	chain_sim.reverse();
 	let mut last_time = 0;
+	let mut first = true;
 	chain_sim.iter().enumerate().for_each(|(i, b)| {
 		let block = b.as_ref().unwrap();
+		if first {
+			last_time = block.0;
+			first = false;
+		}
 		println!(
 			"Height: {}, Time: {}, Interval: {}, Next network difficulty:{}",
 			i,
@@ -179,6 +196,25 @@ fn adjustment_scenarios() {
 	println!("*********************************************************");
 	print_chain_sim(&chain_sim);
 	println!("*********************************************************");
+
+	// Actual testnet 2 timings
+	let testnet2_intervals = [
+		2880, 16701, 1882, 3466, 614, 605, 1551, 538, 931, 23, 690, 1397, 2112, 2058, 605, 721,
+		2148, 1605, 134, 1234, 1569, 482, 1775, 2732, 540, 958, 883, 3475, 518, 1346, 1926, 780,
+		865, 269, 141, 105, 781, 289, 256, 709, 68, 165, 1813, 3899, 1458, 955, 2336, 239, 674,
+		1059, 157, 214, 15, 157, 558, 1945, 1677,
+	];
+
+	global::set_mining_mode(global::ChainTypes::Testnet2);
+	let chain_sim = create_chain_sim(global::initial_block_difficulty());
+	let chain_sim = add_blocks(testnet2_intervals.to_vec(), chain_sim);
+
+	println!("");
+	println!("*********************************************************");
+	println!("Scenario 6) Testnet2");
+	println!("*********************************************************");
+	print_chain_sim(&chain_sim);
+	println!("*********************************************************");
 }
 
 /// Checks different next_target adjustments and difficulty boundaries