blockchain.rs

		let b2 = canon_chain.generate(&mut finalizer).unwrap();
		let b3b = canon_chain.fork(1).generate(&mut finalizer.fork()).unwrap();
		let b3a = canon_chain.generate(&mut finalizer).unwrap();

		let genesis_hash = BlockView::new(&genesis).header_view().sha3();
		let b1_hash= BlockView::new(&b1).header_view().sha3();
		let b2_hash= BlockView::new(&b2).header_view().sha3();
		let b3a_hash= BlockView::new(&b3a).header_view().sha3();
		let b3b_hash= BlockView::new(&b3b).header_view().sha3();

		// b3a is a part of canon chain, whereas b3b is part of sidechain
		let best_block_hash = b3a_hash.clone();

		let temp = RandomTempPath::new();
		let bc = BlockChain::new(Config::default(), &genesis, temp.as_path());
		let ir1 = bc.insert_block(&b1, vec![]);
		let ir2 = bc.insert_block(&b2, vec![]);
		let ir3b = bc.insert_block(&b3b, vec![]);
		let ir3a = bc.insert_block(&b3a, vec![]);

		assert_eq!(ir1, ImportRoute {
			enacted: vec![b1_hash],
			retracted: vec![],
			omitted: vec![],
		});

		assert_eq!(ir2, ImportRoute {
			enacted: vec![b2_hash],
			retracted: vec![],
			omitted: vec![],
		});

		assert_eq!(ir3b, ImportRoute {
			enacted: vec![b3b_hash],
			retracted: vec![],
			omitted: vec![],
		});

		assert_eq!(ir3a, ImportRoute {
			enacted: vec![b3a_hash],
			retracted: vec![b3b_hash],
			omitted: vec![],
		});

		assert_eq!(bc.best_block_hash(), best_block_hash);
		assert_eq!(bc.block_number(&genesis_hash).unwrap(), 0);
		assert_eq!(bc.block_number(&b1_hash).unwrap(), 1);
		assert_eq!(bc.block_number(&b2_hash).unwrap(), 2);
		assert_eq!(bc.block_number(&b3a_hash).unwrap(), 3);
		assert_eq!(bc.block_number(&b3b_hash).unwrap(), 3);

		assert_eq!(bc.block_hash(0).unwrap(), genesis_hash);
		assert_eq!(bc.block_hash(1).unwrap(), b1_hash);
		assert_eq!(bc.block_hash(2).unwrap(), b2_hash);
		assert_eq!(bc.block_hash(3).unwrap(), b3a_hash);

		// test trie route
		let r0_1 = bc.tree_route(genesis_hash.clone(), b1_hash.clone());
		assert_eq!(r0_1.ancestor, genesis_hash);
		assert_eq!(r0_1.blocks, [b1_hash.clone()]);
		assert_eq!(r0_1.index, 0);

		let r0_2 = bc.tree_route(genesis_hash.clone(), b2_hash.clone());
		assert_eq!(r0_2.ancestor, genesis_hash);
		assert_eq!(r0_2.blocks, [b1_hash.clone(), b2_hash.clone()]);
		assert_eq!(r0_2.index, 0);

		let r1_3a = bc.tree_route(b1_hash.clone(), b3a_hash.clone());
		assert_eq!(r1_3a.ancestor, b1_hash);
		assert_eq!(r1_3a.blocks, [b2_hash.clone(), b3a_hash.clone()]);
		assert_eq!(r1_3a.index, 0);

		let r1_3b = bc.tree_route(b1_hash.clone(), b3b_hash.clone());
		assert_eq!(r1_3b.ancestor, b1_hash);
		assert_eq!(r1_3b.blocks, [b2_hash.clone(), b3b_hash.clone()]);
		assert_eq!(r1_3b.index, 0);

		let r3a_3b = bc.tree_route(b3a_hash.clone(), b3b_hash.clone());
		assert_eq!(r3a_3b.ancestor, b2_hash);
		assert_eq!(r3a_3b.blocks, [b3a_hash.clone(), b3b_hash.clone()]);
		assert_eq!(r3a_3b.index, 1);

		let r1_0 = bc.tree_route(b1_hash.clone(), genesis_hash.clone());
		assert_eq!(r1_0.ancestor, genesis_hash);
		assert_eq!(r1_0.blocks, [b1_hash.clone()]);
		assert_eq!(r1_0.index, 1);

		let r2_0 = bc.tree_route(b2_hash.clone(), genesis_hash.clone());
		assert_eq!(r2_0.ancestor, genesis_hash);
		assert_eq!(r2_0.blocks, [b2_hash.clone(), b1_hash.clone()]);
		assert_eq!(r2_0.index, 2);

		let r3a_1 = bc.tree_route(b3a_hash.clone(), b1_hash.clone());
		assert_eq!(r3a_1.ancestor, b1_hash);
		assert_eq!(r3a_1.blocks, [b3a_hash.clone(), b2_hash.clone()]);
		assert_eq!(r3a_1.index, 2);

		let r3b_1 = bc.tree_route(b3b_hash.clone(), b1_hash.clone());
		assert_eq!(r3b_1.ancestor, b1_hash);
		assert_eq!(r3b_1.blocks, [b3b_hash.clone(), b2_hash.clone()]);
		assert_eq!(r3b_1.index, 2);

		let r3b_3a = bc.tree_route(b3b_hash.clone(), b3a_hash.clone());
		assert_eq!(r3b_3a.ancestor, b2_hash);
		assert_eq!(r3b_3a.blocks, [b3b_hash.clone(), b3a_hash.clone()]);
		assert_eq!(r3b_3a.index, 1);
	}

	#[test]
	fn test_reopen_blockchain_db() {
		let mut canon_chain = ChainGenerator::default();
		let mut finalizer = BlockFinalizer::default();
		let genesis = canon_chain.generate(&mut finalizer).unwrap();
		let first = canon_chain.generate(&mut finalizer).unwrap();
		let genesis_hash = BlockView::new(&genesis).header_view().sha3();
		let first_hash = BlockView::new(&first).header_view().sha3();

		let temp = RandomTempPath::new();
		{
			let bc = BlockChain::new(Config::default(), &genesis, temp.as_path());
			assert_eq!(bc.best_block_hash(), genesis_hash);
			bc.insert_block(&first, vec![]);
			assert_eq!(bc.best_block_hash(), first_hash);
		}

		{
			let bc = BlockChain::new(Config::default(), &genesis, temp.as_path());
			assert_eq!(bc.best_block_hash(), first_hash);
		}
	}

	#[test]
	fn can_contain_arbitrary_block_sequence() {
		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_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);

		while !block_header.is_none() {
			block_header = bc.block_header(&block_header.unwrap().parent_hash);
		}
		assert!(bc.cache_size().blocks > 1024 * 1024);

		for _ in 0..2 {
			bc.collect_garbage();
		}
		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);
	}

	#[test]
	fn find_transaction_by_hash() {
		let genesis = "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".from_hex().unwrap();
		let b1 = "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".from_hex().unwrap();
		let b1_hash = H256::from_str("f53f268d23a71e85c7d6d83a9504298712b84c1a2ba220441c86eeda0bf0b6e3").unwrap();

		let temp = RandomTempPath::new();
		let bc = BlockChain::new(Config::default(), &genesis, temp.as_path());
		bc.insert_block(&b1, vec![]);

		let transactions = bc.transactions(&b1_hash).unwrap();
		assert_eq!(transactions.len(), 7);
		for t in transactions {
			assert_eq!(bc.transaction(&bc.transaction_address(&t.hash()).unwrap()).unwrap(), t);
		}
	}

	#[test]
	fn test_bloom_filter_simple() {
		// TODO: From here
		let bloom_b1 = H2048::from_str("00000020000000000000000000000000000000000000000002000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000040000000000000010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000008000400000000000000000000002000").unwrap();

		let bloom_b2 = H2048::from_str("00000000000000000000000000000000000000000000020000001000000000000000000000000000000000000000000000000000000000000000000000000000100000000000000000008000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000000000000800000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000000000000000000000000002000000000000000000040000000000000000000000000000000000000000000000000000000000000000000000000000000000000000").unwrap();

		let bloom_ba = H2048::from_str("00000000000000000000000000000000000000000000020000000800000000000000000000000000000000000000000000000000000000000000000000000000100000000000000000008000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000000000000800000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000000000000000000000000002000000000000000000040000000000000000000000000000000000000000000000000000000000000000000000000000000000000000").unwrap();

		let mut canon_chain = ChainGenerator::default();
		let mut finalizer = BlockFinalizer::default();
		let genesis = canon_chain.generate(&mut finalizer).unwrap();
		let mut fork = canon_chain.fork(1);
		let mut fork_finalizer = finalizer.fork();
		let b1 = fork.with_bloom(bloom_b1.clone()).generate(&mut fork_finalizer).unwrap();
		let b2 = fork.with_bloom(bloom_b2.clone()).generate(&mut fork_finalizer).unwrap();
		let b3 = fork.with_bloom(bloom_ba.clone()).generate(&mut fork_finalizer).unwrap();
		let b1a = canon_chain.with_bloom(bloom_ba.clone()).generate(&mut finalizer).unwrap();
		let b2a = canon_chain.with_bloom(bloom_ba.clone()).generate(&mut finalizer).unwrap();

		let temp = RandomTempPath::new();
		let bc = BlockChain::new(Config::default(), &genesis, temp.as_path());

		let blocks_b1 = bc.blocks_with_bloom(&bloom_b1, 0, 5);
		let blocks_b2 = bc.blocks_with_bloom(&bloom_b2, 0, 5);
		assert_eq!(blocks_b1, vec![]);
		assert_eq!(blocks_b2, vec![]);

		bc.insert_block(&b1, vec![]);
		let blocks_b1 = bc.blocks_with_bloom(&bloom_b1, 0, 5);
		let blocks_b2 = bc.blocks_with_bloom(&bloom_b2, 0, 5);
		assert_eq!(blocks_b1, vec![1]);
		assert_eq!(blocks_b2, vec![]);

		bc.insert_block(&b2, vec![]);
		let blocks_b1 = bc.blocks_with_bloom(&bloom_b1, 0, 5);
		let blocks_b2 = bc.blocks_with_bloom(&bloom_b2, 0, 5);
		assert_eq!(blocks_b1, vec![1]);
		assert_eq!(blocks_b2, vec![2]);

		// hasn't been forked yet
		bc.insert_block(&b1a, vec![]);
		let blocks_b1 = bc.blocks_with_bloom(&bloom_b1, 0, 5);
		let blocks_b2 = bc.blocks_with_bloom(&bloom_b2, 0, 5);
		let blocks_ba = bc.blocks_with_bloom(&bloom_ba, 0, 5);
		assert_eq!(blocks_b1, vec![1]);
		assert_eq!(blocks_b2, vec![2]);
		assert_eq!(blocks_ba, vec![]);

		// fork has happend
		bc.insert_block(&b2a, vec![]);
		let blocks_b1 = bc.blocks_with_bloom(&bloom_b1, 0, 5);
		let blocks_b2 = bc.blocks_with_bloom(&bloom_b2, 0, 5);
		let blocks_ba = bc.blocks_with_bloom(&bloom_ba, 0, 5);
		assert_eq!(blocks_b1, vec![]);
		assert_eq!(blocks_b2, vec![]);
		assert_eq!(blocks_ba, vec![1, 2]);

		// fork back
		bc.insert_block(&b3, vec![]);
		let blocks_b1 = bc.blocks_with_bloom(&bloom_b1, 0, 5);
		let blocks_b2 = bc.blocks_with_bloom(&bloom_b2, 0, 5);
		let blocks_ba = bc.blocks_with_bloom(&bloom_ba, 0, 5);
		assert_eq!(blocks_b1, vec![1]);
		assert_eq!(blocks_b2, vec![2]);
		assert_eq!(blocks_ba, vec![3]);
	}

	#[test]
	fn test_best_block_update() {
		let mut canon_chain = ChainGenerator::default();
		let mut finalizer = BlockFinalizer::default();
		let genesis = canon_chain.generate(&mut finalizer).unwrap();

		let temp = RandomTempPath::new();

		{
			let bc = BlockChain::new(Config::default(), &genesis, temp.as_path());
			let uncle = canon_chain.fork(1).generate(&mut finalizer.fork()).unwrap();

			// create a longer fork
			for _ in 0..5 {
				let canon_block = canon_chain.generate(&mut finalizer).unwrap();
				bc.insert_block(&canon_block, vec![]);
			}

			assert_eq!(bc.best_block_number(), 5);
			bc.insert_block(&uncle, vec![]);
		}

		// re-loading the blockchain should load the correct best block.
		let bc = BlockChain::new(Config::default(), &genesis, temp.as_path());
		assert_eq!(bc.best_block_number(), 5);
	}

	#[test]
	fn test_rewind() {
		let mut canon_chain = ChainGenerator::default();
		let mut finalizer = BlockFinalizer::default();
		let genesis = canon_chain.generate(&mut finalizer).unwrap();
		let first = canon_chain.generate(&mut finalizer).unwrap();
		let second = canon_chain.generate(&mut finalizer).unwrap();
		let genesis_hash = BlockView::new(&genesis).header_view().sha3();
		let first_hash = BlockView::new(&first).header_view().sha3();
		let second_hash = BlockView::new(&second).header_view().sha3();

		let temp = RandomTempPath::new();
		let bc = BlockChain::new(Config::default(), &genesis, temp.as_path());

		bc.insert_block(&first, vec![]);
		bc.insert_block(&second, vec![]);

		assert_eq!(bc.rewind(), Some(first_hash.clone()));
		assert!(!bc.is_known(&second_hash));
		assert_eq!(bc.best_block_number(), 1);
		assert_eq!(bc.best_block_hash(), first_hash.clone());

		assert_eq!(bc.rewind(), Some(genesis_hash.clone()));
		assert_eq!(bc.rewind(), None);
	}
}