OpenTally/tests/ers97.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/>.
*/
mod utils;
use opentally::election::{CandidateState, CountState, Election};
use opentally::numbers::Rational;
use opentally::stv;
use csv::StringRecord;
use std::fs::File;
use std::io::{self, BufRead};
#[test]
fn ers97_rational() {
let stv_opts = stv::STVOptions {
round_tvs: Some(2),
round_weights: Some(2),
round_votes: Some(2),
round_quota: Some(2),
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sum_surplus_transfers: stv::SumSurplusTransfersMode::SingleStep,
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normalise_ballots: false,
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quota: stv::QuotaType::DroopExact,
quota_criterion: stv::QuotaCriterion::GreaterOrEqual,
quota_mode: stv::QuotaMode::ERS97,
ties: vec![],
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surplus: stv::SurplusMethod::EG,
surplus_order: stv::SurplusOrder::BySize,
transferable_only: true,
exclusion: stv::ExclusionMethod::ByValue,
bulk_exclude: true,
defer_surpluses: true,
pp_decimals: 2,
};
// ---------------------------------------------
// Custom implementation due to nontransferables
// and vote required for election
// Read CSV file
let reader = csv::ReaderBuilder::new()
.has_headers(false)
.from_path("tests/data/ers97.csv")
.expect("IO Error");
let records: Vec<StringRecord> = reader.into_records().map(|r| r.expect("Syntax Error")).collect();
let mut candidates: Vec<&str> = records.iter().skip(2).map(|r| &r[0]).collect();
// Remove NT/VRE rows
candidates.truncate(candidates.len() - 2);
// TODO: Validate candidate names
let stages: Vec<usize> = records.first().unwrap().iter().skip(1).step_by(2).map(|s| s.parse().unwrap()).collect();
// Read BLT
let file = File::open("tests/data/ers97.blt").expect("IO Error");
let file_reader = io::BufReader::new(file);
let lines = file_reader.lines();
let election: Election<Rational> = Election::from_blt(lines.map(|r| r.expect("IO Error").to_string()).into_iter());
// 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 (idx, stage) in stages.into_iter().enumerate() {
while stage_num < stage {
// Step through stages
// Assert count not yet done
assert_eq!(stv::count_one_stage(&mut state, &stv_opts).unwrap(), false);
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stage_num += 1;
}
println!("Col at idx {}", idx);
let mut candidate_votes: Vec<Option<Rational>> = records.iter().skip(2)
.map(|r|
if r[idx*2 + 1].len() > 0 {
Some(opentally::numbers::From::from(r[idx*2 + 1].parse::<f64>().expect("Syntax Error")))
} else {
None
})
.collect();
// Validate NT/VRE
let vre_votes = candidate_votes.pop().unwrap();
let nt_votes = candidate_votes.pop().unwrap();
assert!(&state.exhausted.votes + &state.loss_fraction.votes == nt_votes.unwrap());
if let Some(v) = vre_votes {
assert!(state.vote_required_election.as_ref().unwrap() == &v);
}
// Remove NT/VRE rows
candidate_votes.truncate(candidate_votes.len() - 2);
// Validate candidate votes
for (candidate, votes) in state.election.candidates.iter().zip(candidate_votes) {
let count_card = state.candidates.get(candidate).unwrap();
assert!(&count_card.votes == votes.as_ref().unwrap(), "Failed to validate votes for candidate {}. Expected {:}, got {:}", candidate.name, votes.unwrap(), count_card.votes);
}
// Validate candidate states
let mut candidate_states: Vec<&str> = records.iter().skip(2).map(|r| &r[idx*2 + 2]).collect();
candidate_states.truncate(candidate_states.len() - 2);
for (candidate, candidate_state) in state.election.candidates.iter().zip(candidate_states) {
let count_card = state.candidates.get(candidate).unwrap();
if candidate_state == "" {
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assert!(count_card.state == CandidateState::Hopeful);
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} else if candidate_state == "EL" || candidate_state == "PEL" {
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assert!(count_card.state == CandidateState::Elected);
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} else if candidate_state == "EX" || candidate_state == "EXCLUDING" {
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assert!(count_card.state == CandidateState::Excluded);
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} else {
panic!("Unknown state descriptor {}", candidate_state);
}
}
}
}