// Copyright 2015-2020 Parity Technologies (UK) Ltd.
// This file is part of Parity Ethereum.

// Parity Ethereum is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// Parity Ethereum is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with Parity Ethereum.  If not, see <http://www.gnu.org/licenses/>.

use blockchain::BlockProvider;

use test_helpers::{
	generate_dummy_blockchain,
	generate_dummy_blockchain_with_extra,
	generate_dummy_empty_blockchain,
};

#[test]
fn can_contain_arbitrary_block_sequence() {
	let bc = generate_dummy_blockchain(50);
	assert_eq!(bc.best_block_number(), 49);
}

#[test]
fn can_collect_garbage() {
	let bc = generate_dummy_blockchain(3000);

	assert_eq!(bc.best_block_number(), 2999);
	let best_hash = bc.best_block_hash();
	let mut block_header = bc.block_header_data(&best_hash);

	while !block_header.is_none() {
		block_header = bc.block_header_data(&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 = generate_dummy_blockchain_with_extra(25);
	assert_eq!(bc.best_block_number(), 24);
}

#[test]
fn can_contain_only_genesis_block() {
	let bc = generate_dummy_empty_blockchain();
	assert_eq!(bc.best_block_number(), 0);
}