refactored to guard

src/blockchain.rs

@@ -766,13 +766,16 @@ mod tests {
 
 	#[test]
 	fn can_contain_arbitrary_block_sequence() {
-		let bc = generate_dummy_blockchain(50);
+		let bc_result = generate_dummy_blockchain(50);
+		let bc = bc_result.reference();
 		assert_eq!(bc.best_block_number(), 49);
 	}
 
 	#[test]
 	fn can_collect_garbage() {
-		let bc = generate_dummy_blockchain(3000);
+		let bc_result = generate_dummy_blockchain(3000);
+		let bc = bc_result.reference();
+
 		assert_eq!(bc.best_block_number(), 2999);
 		let best_hash = bc.best_block_hash();
 		let mut block_header = bc.block_header(&best_hash);
@@ -786,4 +789,18 @@ mod tests {
 
 		assert!(bc.cache_size().blocks < 1024 * 1024);
 	}
+
+	#[test]
+	fn can_contain_arbitrary_block_sequence_with_extra() {
+		let bc_result = generate_dummy_blockchain_with_extra(25);
+		let bc = bc_result.reference();
+		assert_eq!(bc.best_block_number(), 24);
+	}
+
+	#[test]
+	fn can_contain_only_genesis_block() {
+		let bc_result = generate_dummy_empty_blockchain();
+		let bc = bc_result.reference();
+		assert_eq!(bc.best_block_number(), 0);
+	}
 }

src/tests/client.rs

@@ -30,21 +30,6 @@ fn get_bad_state_dummy_block() -> Bytes {
 	create_test_block(&block_header)
 }
 
-
-fn get_test_client_with_blocks(blocks: Vec<Bytes>) -> Arc<Client> {
-	let dir = RandomTempPath::new();
-	let client = Client::new(get_test_spec(), dir.as_path(), IoChannel::disconnected()).unwrap();
-	for block in &blocks {
-		if let Err(_) = client.import_block(block.clone()) {
-			panic!("panic importing block which is well-formed");
-		}
-	}
-	client.flush_queue();
-	client.import_verified_blocks(&IoChannel::disconnected());
-	client
-}
-
-
 #[test]
 fn created() {
 	let dir = RandomTempPath::new();
@@ -86,7 +71,8 @@ fn query_none_block() {
 
 #[test]
 fn query_bad_block() {
-	let client = get_test_client_with_blocks(vec![get_bad_state_dummy_block()]);
+	let client_result = get_test_client_with_blocks(vec![get_bad_state_dummy_block()]);
+	let client = client_result.reference();
 	let bad_block:Option<Bytes> = client.block_header_at(1);
 
 	assert!(bad_block.is_none());
@@ -95,7 +81,8 @@ fn query_bad_block() {
 #[test]
 fn returns_chain_info() {
 	let dummy_block = get_good_dummy_block();
-	let client = get_test_client_with_blocks(vec![dummy_block.clone()]);
+	let client_result = get_test_client_with_blocks(vec![dummy_block.clone()]);
+	let client = client_result.reference();
 	let block = BlockView::new(&dummy_block);
 	let info = client.chain_info();
 	assert_eq!(info.best_block_hash, block.header().hash());
@@ -103,7 +90,8 @@ fn returns_chain_info() {
 
 #[test]
 fn imports_block_sequence() {
-	let client = generate_dummy_client(6);
+	let client_result = generate_dummy_client(6);
+	let client = client_result.reference();
 	let block = client.block_header_at(5).unwrap();
 
 	assert!(!block.is_empty());
@@ -111,7 +99,8 @@ fn imports_block_sequence() {
 
 #[test]
 fn can_collect_garbage() {
-	let client = generate_dummy_client(100);
+	let client_result = generate_dummy_client(100);
+	let client = client_result.reference();
 	client.tick();
 	assert!(client.cache_info().blocks < 100 * 1024);
 }

src/tests/helpers.rs

@@ -33,6 +33,18 @@ impl Drop for RandomTempPath {
 	}
 }
 
+#[allow(dead_code)]
+pub struct GuardedTempResult<T> {
+	result: T,
+	temp: RandomTempPath
+}
+
+impl<T> GuardedTempResult<T> {
+    pub fn reference(&self) -> &T {
+        &self.result
+    }
+}
+
 pub fn get_test_spec() -> Spec {
 	Spec::new_test()
 }
@@ -45,7 +57,7 @@ pub fn create_test_block(header: &Header) -> Bytes {
 	rlp.out()
 }
 
-fn create_unverifiable_block_header(order: usize, parent_hash: H256) -> Header {
+fn create_unverifiable_block_header(order: u32, parent_hash: H256) -> Header {
 	let mut header = Header::new();
 	header.gas_limit = x!(0);
 	header.difficulty = x!(order * 100);
@@ -57,24 +69,24 @@ fn create_unverifiable_block_header(order: usize, parent_hash: H256) -> Header {
 	header
 }
 
-fn create_unverifiable_block(order: usize, parent_hash: H256) -> Bytes {
-	create_test_block_header(&create_unverifiable_block_header(order, parent_hash))
+fn create_unverifiable_block(order: u32, parent_hash: H256) -> Bytes {
+	create_test_block(&create_unverifiable_block_header(order, parent_hash))
 }
 
-fn create_unverifiable_block_with_extra(order: usize, parent_hash: H256, Option<Bytes> extra) -> Bytes {
-	let mut header = create_test_block_header(order, parent_hash);
+fn create_unverifiable_block_with_extra(order: u32, parent_hash: H256, extra: Option<Bytes>) -> Bytes {
+	let mut header = create_unverifiable_block_header(order, parent_hash);
 	header.extra_data = match extra {
 		Some(extra_data) => extra_data,
 		None => {
-			let base = order as u8;
-		    vec!([1, 2, 3])
+			let base = (order & 0x000000ff) as u8;
+		    let generated: Vec<u8> = vec![base + 1, base + 2, base + 3];
+		    generated
 		}
-	}
-
+	};
 	create_test_block(&header)
 }
 
-pub fn generate_dummy_client(block_number: usize) -> Arc<Client> {
+pub fn generate_dummy_client(block_number: u32) -> GuardedTempResult<Arc<Client>> {
 	let dir = RandomTempPath::new();
 
 	let client = Client::new(get_test_spec(), dir.as_path(), IoChannel::disconnected()).unwrap();
@@ -106,10 +118,32 @@ pub fn generate_dummy_client(block_number: usize) -> Arc<Client> {
 	}
 	client.flush_queue();
 	client.import_verified_blocks(&IoChannel::disconnected());
-	client
+
+	GuardedTempResult::<Arc<Client>> {
+		temp: dir,
+		result: client
+	}
 }
 
-pub fn generate_dummy_blockchain(block_number: usize) -> BlockChain {
+
+pub fn get_test_client_with_blocks(blocks: Vec<Bytes>) -> GuardedTempResult<Arc<Client>> {
+	let dir = RandomTempPath::new();
+	let client = Client::new(get_test_spec(), dir.as_path(), IoChannel::disconnected()).unwrap();
+	for block in &blocks {
+		if let Err(_) = client.import_block(block.clone()) {
+			panic!("panic importing block which is well-formed");
+		}
+	}
+	client.flush_queue();
+	client.import_verified_blocks(&IoChannel::disconnected());
+
+	GuardedTempResult::<Arc<Client>> {
+		temp: dir,
+		result: client
+	}
+}
+
+pub fn generate_dummy_blockchain(block_number: u32) -> GuardedTempResult<BlockChain> {
 	let temp = RandomTempPath::new();
 	let bc = BlockChain::new(
 		&create_unverifiable_block(
@@ -120,7 +154,41 @@ pub fn generate_dummy_blockchain(block_number: usize) -> BlockChain {
 	for block_order in 1..block_number {
 		bc.insert_block(&create_unverifiable_block(block_order, bc.best_block_hash()));
 	}
-	bc
+
+	GuardedTempResult::<BlockChain> {
+		temp: temp,
+		result: bc
+	}
 }
 
-pub fn generate_dummy_blockchain_with_extra(block_number: uszie
+pub fn generate_dummy_blockchain_with_extra(block_number: u32) -> GuardedTempResult<BlockChain> {
+	let temp = RandomTempPath::new();
+	let bc = BlockChain::new(
+		&create_unverifiable_block(
+			0,
+			H256::from_str("0000000000000000000000000000000000000000000000000000000000000000").unwrap()),
+		temp.as_path());
+
+	for block_order in 1..block_number {
+		bc.insert_block(&create_unverifiable_block_with_extra(block_order, bc.best_block_hash(), None));
+	}
+
+	GuardedTempResult::<BlockChain> {
+		temp: temp,
+		result: bc
+	}
+}
+
+pub fn generate_dummy_empty_blockchain() -> GuardedTempResult<BlockChain> {
+	let temp = RandomTempPath::new();
+	let bc = BlockChain::new(
+		&create_unverifiable_block(
+			0,
+			H256::from_str("0000000000000000000000000000000000000000000000000000000000000000").unwrap()),
+		temp.as_path());
+
+	GuardedTempResult::<BlockChain> {
+		temp: temp,
+		result: bc
+	}
+}