OpenTally/tests/scotland.rs

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/* 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/>.
*/
// https://web.archive.org/web/20121004213938/http://www.glasgow.gov.uk/en/YourCouncil/Elections_Voting/Election_Results/ElectionScotland2007/LGWardResults.htm?ward=1&wardname=1%20-%20Linn
use opentally::election::{CandidateState, CountState, Election};
use opentally::numbers::Fixed;
use opentally::stv;
use num_traits::Zero;
use xmltree::Element;
use std::io::{self, BufRead};
use std::fs::File;
#[test]
fn scotland_linn07_fixed5() {
let stv_opts = stv::STVOptions {
round_tvs: Some(5),
round_weights: None,
round_votes: None,
round_quota: Some(0),
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sum_surplus_transfers: stv::SumSurplusTransfersMode::PerBallot,
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quota: stv::QuotaType::Droop,
quota_criterion: stv::QuotaCriterion::GreaterOrEqual,
quota_mode: stv::QuotaMode::Static,
surplus: stv::SurplusMethod::WIG,
surplus_order: stv::SurplusOrder::BySize,
transferable_only: false,
exclusion: stv::ExclusionMethod::SingleStage,
bulk_exclude: false,
defer_surpluses: false,
pp_decimals: 5,
};
Fixed::set_dps(5);
// Read XML file
let file = File::open("tests/data/linn07.xml").expect("IO Error");
let root = Element::parse(file).expect("Parse Error");
let mut candidates: Vec<&Element> = root.children.iter()
.filter_map(|n| match n {
xmltree::XMLNode::Element(e) => if e.name == "candidate" { Some(e) } else { None },
_ => None,
})
.collect();
let cand_nt = candidates.pop().unwrap();
// TODO: Validate candidate names
let num_stages = root.get_child("headerrow").expect("Syntax Error").children.len();
// Read BLT
let file = File::open("tests/data/linn07.blt").expect("IO Error");
let file_reader = io::BufReader::new(file);
let lines = file_reader.lines();
let mut election: Election<Fixed> = Election::from_blt(lines.map(|r| r.expect("IO Error").to_string()).into_iter());
// !!! FOR SCOTTISH STV !!!
election.normalise_ballots();
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// Initialise count state
let mut state = CountState::new(&election);
// Distribute first preferences
stv::count_init(&mut state, &stv_opts);
let mut stage_num = 1;
for i in 0..num_stages {
println!("Stage {}", stage_num);
// Validate NT
let nt_votes = get_cand_stage(cand_nt, i)
.get_child("value").unwrap()
.get_text().unwrap()
.to_string();
assert!((&state.exhausted.votes + &state.loss_fraction.votes) == parse_str(nt_votes));
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for (candidate, cand_xml) in state.election.candidates.iter().zip(candidates.iter()) {
let count_card = state.candidates.get(candidate).unwrap();
// Validate candidate votes
let cand_votes = get_cand_stage(cand_xml, i)
.get_child("value").unwrap()
.get_text().unwrap()
.to_string();
let cand_votes = parse_str(cand_votes);
assert!(count_card.votes == cand_votes, "Failed to validate votes for candidate {}. Expected {:}, got {:}", candidate.name, cand_votes, count_card.votes);
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// Validate candidate states
let cand_state = get_cand_stage(cand_xml, i)
.get_child("status").unwrap()
.get_text().unwrap()
.to_string();
if cand_state == "Continuing" {
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assert!(count_card.state == CandidateState::Hopeful);
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} else if cand_state == "Elected" {
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assert!(count_card.state == CandidateState::Elected);
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} else if cand_state == "Excluded" {
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assert!(count_card.state == CandidateState::Excluded);
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} else {
panic!("Unknown state descriptor {}", cand_state);
}
}
assert_eq!(stv::count_one_stage(&mut state, &stv_opts).unwrap(), false);
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stage_num += 1;
}
assert_eq!(stv::count_one_stage(&mut state, &stv_opts).unwrap(), true);
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}
fn get_cand_stage(candidate: &Element, idx: usize) -> &Element {
return candidate.children.iter()
.filter_map(|n| match n {
xmltree::XMLNode::Element(e) => if e.name == "stage" { Some(e) } else { None },
_ => None,
})
.nth(idx).unwrap();
}
fn parse_str(s: String) -> Fixed {
if s == "-" { return Fixed::zero(); }
let f: f64 = s.parse().expect("Syntax Error");
return opentally::numbers::From::from(f);
}