OpenTally/tests/meek.rs

/*  OpenTally: Open-source election vote counting
 *  Copyright © 2021 Lee Yingtong Li (RunasSudo)
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Affero General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program 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 Affero General Public License for more details.
 *
 *  You should have received a copy of the GNU Affero General Public License
 *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

mod utils;

use opentally::election::{CandidateState, CountState, Election};
use opentally::numbers::{Fixed, NativeFloat64, Number};
use opentally::stv;

// Compare ers97.blt count with result produced by 1987 Hill–Wichmann–Woodall reference implementation
#[test]
fn meek87_ers97_float64() {
	let stv_opts = stv::STVOptionsBuilder::default()
		.meek_surplus_tolerance("0.001%".to_string())
		.quota_criterion(stv::QuotaCriterion::GreaterOrEqual)
		.quota_mode(stv::QuotaMode::DynamicByTotal)
		.surplus(stv::SurplusMethod::Meek)
		.immediate_elect(false)
		.build().unwrap();
	
	utils::read_validate_election::<NativeFloat64>("tests/data/ers97_meek.csv", "tests/data/ers97.blt", stv_opts, Some(2), &["exhausted", "quota"]);
}

// Compare ers97.blt count with result produced by OpenSTV 1.7 "Meek STV"
#[test]
fn meek06_ers97_fixed12() {
	let stv_opts = stv::STVOptionsBuilder::default()
		.round_surplus_fractions(Some(9))
		.round_values(Some(9))
		.round_votes(Some(9))
		.round_quota(Some(9))
		.meek_surplus_tolerance("0.0001".to_string())
		.quota(stv::QuotaType::Droop)
		.quota_criterion(stv::QuotaCriterion::GreaterOrEqual)
		.quota_mode(stv::QuotaMode::DynamicByTotal)
		.surplus(stv::SurplusMethod::Meek)
		.defer_surpluses(true)
		.build().unwrap();
	
	Fixed::set_dps(12);
	
	// Read BLT
	let election: Election<Fixed> = Election::from_file("tests/data/ers97.blt").expect("Syntax Error");
	
	// Initialise count state
	let mut state = CountState::new(&election);
	
	// Count to completion
	stv::count_init(&mut state, &stv_opts).unwrap();
	while !stv::count_one_stage::<Fixed>(&mut state, &stv_opts).unwrap() {}
	
	// Check states and keep values
	for (candidate, count_card) in state.candidates.iter() {
		match candidate.name.as_str() {
			"Smith" => {
				assert!(count_card.state == CandidateState::Elected);
				assert_eq!(count_card.keep_value, Some(Fixed::parse("0.452239778")));
			}
			"Carpenter" => {
				assert!(count_card.state == CandidateState::Elected);
				assert_eq!(count_card.keep_value, Some(Fixed::parse("0.614726576")));
			}
			"Duke" => {
				assert!(count_card.state == CandidateState::Elected);
				assert_eq!(count_card.keep_value, Some(Fixed::parse("0.610901635")));
			}
			"Prince" => {
				assert!(count_card.state == CandidateState::Elected);
				assert_eq!(count_card.keep_value, Some(Fixed::parse("0.741971929")));
			}
			"Freeman" => {
				assert!(count_card.state == CandidateState::Elected);
				assert_eq!(count_card.keep_value, Some(Fixed::parse("0.715546058")));
			}
			"Vicar" => {
				assert!(count_card.state == CandidateState::Elected);
				assert_eq!(count_card.keep_value, Some(Fixed::parse("1.0")));
			}
			_ => {}
		}
	}
}

// Compare ers97.blt count with result produced by OpenSTV 1.7 "New Zealand Meek STV" (same result as Hill 2006 implementation)
#[test]
fn meeknz_ers97_fixed12() {
	let stv_opts = stv::STVOptionsBuilder::default()
		.round_surplus_fractions(Some(9))
		.round_values(Some(9))
		.round_votes(Some(9))
		.round_quota(Some(9))
		.meek_surplus_tolerance("0.0001".to_string())
		.quota(stv::QuotaType::Droop)
		.quota_criterion(stv::QuotaCriterion::GreaterOrEqual)
		.quota_mode(stv::QuotaMode::DynamicByTotal)
		.surplus(stv::SurplusMethod::Meek)
		.meek_nz_exclusion(true)
		.defer_surpluses(true)
		.build().unwrap();
	
	Fixed::set_dps(12);
	
	// Read BLT
	let election: Election<Fixed> = Election::from_file("tests/data/ers97.blt").expect("Syntax Error");
	
	// Initialise count state
	let mut state = CountState::new(&election);
	
	// Count to completion
	stv::count_init(&mut state, &stv_opts).unwrap();
	while !stv::count_one_stage::<Fixed>(&mut state, &stv_opts).unwrap() {}
	
	// Check states and keep values
	for (candidate, count_card) in state.candidates.iter() {
		match candidate.name.as_str() {
			"Smith" => {
				assert!(count_card.state == CandidateState::Elected);
				assert_eq!(count_card.keep_value, Some(Fixed::parse("0.452154292")));
			}
			"Carpenter" => {
				assert!(count_card.state == CandidateState::Elected);
				assert_eq!(count_card.keep_value, Some(Fixed::parse("0.614574172")));
			}
			"Duke" => {
				assert!(count_card.state == CandidateState::Elected);
				assert_eq!(count_card.keep_value, Some(Fixed::parse("0.610780881")));
			}
			"Prince" => {
				assert!(count_card.state == CandidateState::Elected);
				assert_eq!(count_card.keep_value, Some(Fixed::parse("0.741808717")));
			}
			"Freeman" => {
				assert!(count_card.state == CandidateState::Elected);
				assert_eq!(count_card.keep_value, Some(Fixed::parse("0.715384286")));
			}
			"Vicar" => {
				assert!(count_card.state == CandidateState::Elected);
				assert_eq!(count_card.keep_value, Some(Fixed::parse("1.0")));
			}
			_ => {}
		}
	}
}