OpenTally/tests/scotland.rs

159 lines
5.1 KiB
Rust

/* 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::{Fixed, GuardedFixed, Number};
use opentally::parser::blt;
use opentally::stv;
use xmltree::Element;
use std::fs::File;
use std::ops;
#[test]
fn scotland_linn07_fixed5() {
let stv_opts = stv::STVOptionsBuilder::default()
.round_surplus_fractions(Some(5))
//.round_values(Some(5))
//.round_votes(Some(5))
.round_quota(Some(0))
.sum_surplus_transfers(stv::SumSurplusTransfersMode::PerBallot)
//.normalise_ballots(true)
.quota_criterion(stv::QuotaCriterion::GreaterOrEqual)
.early_bulk_elect(false)
.pp_decimals(5)
.build().unwrap();
Fixed::set_dps(5);
scotland_linn07::<Fixed>(stv_opts);
}
#[test]
fn scotland_linn07_gfixed5() {
let stv_opts = stv::STVOptionsBuilder::default()
.round_surplus_fractions(Some(5))
.round_values(Some(5)) // Must specify rounding as guarded decimals represented to 10 dps internally
.round_votes(Some(5))
.round_quota(Some(0))
.sum_surplus_transfers(stv::SumSurplusTransfersMode::PerBallot)
//.normalise_ballots(true)
.quota_criterion(stv::QuotaCriterion::GreaterOrEqual)
.early_bulk_elect(false)
.pp_decimals(5)
.build().unwrap();
GuardedFixed::set_dps(5);
scotland_linn07::<GuardedFixed>(stv_opts);
}
fn scotland_linn07<N: Number>(stv_opts: stv::STVOptions)
where
for<'r> &'r N: ops::Add<&'r N, Output=N>,
for<'r> &'r N: ops::Sub<&'r N, Output=N>,
for<'r> &'r N: ops::Mul<&'r N, Output=N>,
for<'r> &'r N: ops::Div<&'r N, Output=N>,
for<'r> &'r N: ops::Neg<Output=N>,
{
// 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 mut election: Election<N> = blt::parse_path("tests/data/linn07.blt").expect("Syntax Error");
// !!! FOR SCOTTISH STV !!!
election.normalise_ballots();
// Initialise count state
let mut state = CountState::new(&election);
// Distribute first preferences
stv::count_init(&mut state, &stv_opts).unwrap();
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), "Failed to validate NTs. Expected {}, got {}", nt_votes, &state.exhausted.votes + &state.loss_fraction.votes);
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);
// 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" {
assert!(count_card.state == CandidateState::Hopeful);
} else if cand_state == "Elected" {
assert!(count_card.state == CandidateState::Elected);
} else if cand_state == "Excluded" {
assert!(count_card.state == CandidateState::Excluded);
} else {
panic!("Unknown state descriptor {}", cand_state);
}
}
assert_eq!(stv::count_one_stage(&mut state, &stv_opts).unwrap(), false);
stage_num += 1;
}
assert_eq!(stv::count_one_stage(&mut state, &stv_opts).unwrap(), true);
}
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<N: Number>(s: &str) -> N {
if s == "-" { return N::zero(); }
return N::parse(s);
}