OpenTally/tests/aec.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/>.
*/
use opentally::election::{CandidateState, CountState, Election};
use opentally::numbers::{Number, Rational};
use opentally::stv;
use csv::StringRecord;
use flate2::bufread::GzDecoder;
use std::fs::File;
use std::io::{self, BufRead};
#[test]
fn aec_tas19_rational() {
// Read CSV file
let reader = csv::ReaderBuilder::new()
.has_headers(false)
.from_path("tests/data/aec-senate-formalpreferences-24310-TAS.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 exhausted/LBF rows
candidates.truncate(candidates.len() - 2);
let stages: Vec<usize> = records.first().unwrap().iter().skip(1).step_by(2).map(|s| s.parse().unwrap()).collect();
// Decompress BLT
let file = File::open("tests/data/aec-senate-formalpreferences-24310-TAS.blt.gz").expect("IO Error");
let file_reader = io::BufReader::new(file);
let gz_decoder = GzDecoder::new(file_reader);
let gz_reader = io::BufReader::new(gz_decoder);
let lines = gz_reader.lines();
// Read BLT
2021-05-30 18:28:39 +10:00
let election: Election<Rational> = Election::from_blt(lines.map(|r| r.expect("IO Error").to_string()).into_iter());
// TODO: Validate candidate names
// Initialise options
let stv_opts = stv::STVOptions {
round_votes: Some(0),
exclusion: "by_value",
};
// 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), false);
stage_num += 1;
}
validate_stage(idx, &state, &records);
}
}
fn validate_stage<N: Number>(idx: usize, state: &CountState<N>, records: &Vec<StringRecord>) {
// Validate candidate votes
let mut candidate_votes: Vec<N> = records.iter().skip(2).map(|r| N::parse(&r[idx*2 + 1])).collect();
// Remove exhausted/LBF rows
candidate_votes.truncate(candidate_votes.len() - 2);
for (candidate, votes) in state.election.candidates.iter().zip(candidate_votes) {
let count_card = state.candidates.get(candidate).unwrap();
assert!(count_card.votes == 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 == "" {
assert!(count_card.state == CandidateState::HOPEFUL);
} else if candidate_state == "EL" || candidate_state == "PEL" {
assert!(count_card.state == CandidateState::ELECTED);
} else if candidate_state == "EX" || candidate_state == "EXCLUDING" {
assert!(count_card.state == CandidateState::EXCLUDED);
} else {
panic!("Unknown state descriptor {}", candidate_state);
}
}
}