From 929f44fe4f62910fc0eba95257953b09ccd52b24 Mon Sep 17 00:00:00 2001
From: Gav Wood <gav@ethcore.io>
Date: Wed, 2 Mar 2016 00:34:38 +0100
Subject: [PATCH] Tests for Client sealing.

---
 ethcore/src/engine.rs          |  9 +++++++--
 ethcore/src/ethereum/ethash.rs |  3 ++-
 ethcore/src/tests/client.rs    | 20 ++++++++++++++++++++
 3 files changed, 29 insertions(+), 3 deletions(-)

diff --git a/ethcore/src/engine.rs b/ethcore/src/engine.rs
index a05c78ff5..6806fcce3 100644
--- a/ethcore/src/engine.rs
+++ b/ethcore/src/engine.rs
@@ -81,9 +81,14 @@ pub trait Engine : Sync + Send {
 		self.verify_block_basic(header, None).and_then(|_| self.verify_block_unordered(header, None))
 	}
 
-	/// Don't forget to call Super::populateFromParent when subclassing & overriding.
+	/// Don't forget to call Super::populate_from_parent when subclassing & overriding.
 	// TODO: consider including State in the params.
-	fn populate_from_parent(&self, _header: &mut Header, _parent: &Header) {}
+	fn populate_from_parent(&self, header: &mut Header, parent: &Header) {
+		header.parent_hash = parent.hash;
+		header.difficulty = parent.difficulty;
+		header.gas_limit = parent.gas_limit;
+		header.number = parent.number + 1;
+	}
 
 	// TODO: builtin contract routing - to do this properly, it will require removing the built-in configuration-reading logic
 	// from Spec into here and removing the Spec::builtins field.
diff --git a/ethcore/src/ethereum/ethash.rs b/ethcore/src/ethereum/ethash.rs
index 6dabe558f..bf0c1d188 100644
--- a/ethcore/src/ethereum/ethash.rs
+++ b/ethcore/src/ethereum/ethash.rs
@@ -144,7 +144,8 @@ impl Engine for Ethash {
 		let difficulty = Ethash::boundary_to_difficulty(&Ethash::from_ethash(quick_get_difficulty(
 			&Ethash::to_ethash(header.bare_hash()),
 			header.nonce().low_u64(),
-			&Ethash::to_ethash(header.mix_hash()) )));
+			&Ethash::to_ethash(header.mix_hash())
+		)));
 		if difficulty < header.difficulty {
 			return Err(From::from(BlockError::InvalidProofOfWork(OutOfBounds { min: Some(header.difficulty), max: None, found: difficulty })));
 		}
diff --git a/ethcore/src/tests/client.rs b/ethcore/src/tests/client.rs
index 83df81fa2..65c9d7358 100644
--- a/ethcore/src/tests/client.rs
+++ b/ethcore/src/tests/client.rs
@@ -15,6 +15,7 @@
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.
 
 use client::{BlockChainClient, Client, ClientConfig, BlockId};
+use block::IsBlock;
 use tests::helpers::*;
 use common::*;
 use devtools::*;
@@ -106,3 +107,22 @@ fn can_collect_garbage() {
 	client.tick();
 	assert!(client.blockchain_cache_info().blocks < 100 * 1024);
 }
+
+#[test]
+fn can_mine() {
+	let dummy_blocks = get_good_dummy_block_seq(2);
+	let client_result = get_test_client_with_blocks(vec![dummy_blocks[0].clone()]);
+	let client = client_result.reference();
+	let b = client.sealing_block();
+	let pow_hash = {
+		let u = b.lock().unwrap();
+		match *u {
+			Some(ref b) => {
+				assert_eq!(*b.block().header().parent_hash(), BlockView::new(&dummy_blocks[0]).header_view().sha3());
+				b.hash()
+			}
+			None => { panic!(); }
+		}	
+	};
+	assert!(client.submit_seal(pow_hash, vec![]).is_ok());
+}
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