pyRCV2/tests/test_ties.py

#   pyRCV2: Preferential vote counting
#   Copyright © 2020–2021  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/>.

import pytest

from pyRCV2.model import Candidate, CountCard
from pyRCV2.numbers import Num
from pyRCV2.ties import TiesBackwards, TiesForwards, TiesPrompt, TiesRandom
import tests.util

def test_prompt_py(monkeypatch):
	l = [
		(Candidate('A'), CountCard()),
		(Candidate('B'), CountCard()),
		(Candidate('C'), CountCard()),
	]
	t = TiesPrompt()
	monkeypatch.setattr('builtins.input', lambda _: '1')
	assert t.choose_lowest(l) == l[0]
	assert t.choose_highest(l) == l[0]
	monkeypatch.setattr('builtins.input', lambda _: '2')
	assert t.choose_lowest(l) == l[1]
	assert t.choose_highest(l) == l[1]

def test_prompt_js():
	ctx = tests.util.init_context()
	ctx.eval('let l = [[py.pyRCV2.model.Candidate("A"), py.pyRCV2.model.CountCard()], [py.pyRCV2.model.Candidate("B"), py.pyRCV2.model.CountCard()], [py.pyRCV2.model.Candidate("C"), py.pyRCV2.model.CountCard()]];')
	ctx.eval('let tie = py.pyRCV2.ties.TiesPrompt();')
	ctx.eval('let raised = false; try { tie.choose_lowest(l); } catch (ex) { if (py.isinstance(ex, py.pyRCV2.ties.RequireInput)) { raised = true; } }')
	assert ctx.eval('raised') == True
	
	ctx.eval('tie.buffer = "1";')
	assert ctx.eval('tie.choose_lowest(l) === l[0]')
	ctx.eval('tie.buffer = "1";')
	assert ctx.eval('tie.choose_highest(l) === l[0]')
	ctx.eval('tie.buffer = "2";')
	assert ctx.eval('tie.choose_lowest(l) === l[1]')
	ctx.eval('tie.buffer = "2";')
	assert ctx.eval('tie.choose_highest(l) === l[1]')

class Stub:
	pass

def test_backwards_py():
	l = [
		(Candidate('A'), CountCard()),
		(Candidate('B'), CountCard()),
		(Candidate('C'), CountCard()),
	]
	
	# Prepare previous results
	result1 = Stub()
	result1.candidates = {l[0][0]: CountCard(), l[1][0]: CountCard(), l[2][0]: CountCard()}
	result1.candidates[l[0][0]].orig_votes = Num(10)
	result1.candidates[l[1][0]].orig_votes = Num(20)
	result1.candidates[l[2][0]].orig_votes = Num(30)
	
	result2 = Stub()
	result2.candidates = {l[0][0]: CountCard(), l[1][0]: CountCard(), l[2][0]: CountCard()}
	result2.candidates[l[0][0]].orig_votes = Num(30)
	result2.candidates[l[1][0]].orig_votes = Num(20)
	result2.candidates[l[2][0]].orig_votes = Num(10)
	
	counter = Stub()
	counter.step_results = [result1, result2]
	
	t = TiesBackwards(counter)
	assert t.choose_lowest(l) == l[2]
	assert t.choose_highest(l) == l[0]

def test_backwards_js():
	ctx = tests.util.init_context()
	ctx.eval('let l = [[py.pyRCV2.model.Candidate("A"), py.pyRCV2.model.CountCard()], [py.pyRCV2.model.Candidate("B"), py.pyRCV2.model.CountCard()], [py.pyRCV2.model.Candidate("C"), py.pyRCV2.model.CountCard()]];')
	
	# Prepare previous results
	ctx.eval('let result1 = {candidates: py.pyRCV2.safedict.SafeDict([[l[0][0], {votes: py.pyRCV2.numbers.Num(10)}], [l[1][0], {votes: py.pyRCV2.numbers.Num(20)}], [l[2][0], {votes: py.pyRCV2.numbers.Num(30)}]])};')
	ctx.eval('let result2 = {candidates: py.pyRCV2.safedict.SafeDict([[l[0][0], {votes: py.pyRCV2.numbers.Num(30)}], [l[1][0], {votes: py.pyRCV2.numbers.Num(20)}], [l[2][0], {votes: py.pyRCV2.numbers.Num(10)}]])};')
	ctx.eval('let counter = {step_results: [result1, result2]};')
	
	ctx.eval('let tie = py.pyRCV2.ties.TiesBackwards(counter);')
	assert ctx.eval('tie.choose_lowest(l) === l[2]')
	assert ctx.eval('tie.choose_highest(l) === l[0]')

def test_forwards_py():
	l = [
		(Candidate('A'), CountCard()),
		(Candidate('B'), CountCard()),
		(Candidate('C'), CountCard()),
	]
	
	# Prepare previous results
	result1 = Stub()
	result1.candidates = {l[0][0]: CountCard(), l[1][0]: CountCard(), l[2][0]: CountCard()}
	result1.candidates[l[0][0]].orig_votes = Num(10)
	result1.candidates[l[1][0]].orig_votes = Num(20)
	result1.candidates[l[2][0]].orig_votes = Num(30)
	
	result2 = Stub()
	result2.candidates = {l[0][0]: CountCard(), l[1][0]: CountCard(), l[2][0]: CountCard()}
	result2.candidates[l[0][0]].orig_votes = Num(30)
	result2.candidates[l[1][0]].orig_votes = Num(20)
	result2.candidates[l[2][0]].orig_votes = Num(10)
	
	counter = Stub()
	counter.step_results = [result1, result2]
	
	t = TiesForwards(counter)
	assert t.choose_lowest(l) == l[0]
	assert t.choose_highest(l) == l[2]

def test_forwards_js():
	ctx = tests.util.init_context()
	ctx.eval('let l = [[py.pyRCV2.model.Candidate("A"), py.pyRCV2.model.CountCard()], [py.pyRCV2.model.Candidate("B"), py.pyRCV2.model.CountCard()], [py.pyRCV2.model.Candidate("C"), py.pyRCV2.model.CountCard()]];')
	
	# Prepare previous results
	ctx.eval('let result1 = {candidates: py.pyRCV2.safedict.SafeDict([[l[0][0], {votes: py.pyRCV2.numbers.Num(10)}], [l[1][0], {votes: py.pyRCV2.numbers.Num(20)}], [l[2][0], {votes: py.pyRCV2.numbers.Num(30)}]])};')
	ctx.eval('let result2 = {candidates: py.pyRCV2.safedict.SafeDict([[l[0][0], {votes: py.pyRCV2.numbers.Num(30)}], [l[1][0], {votes: py.pyRCV2.numbers.Num(20)}], [l[2][0], {votes: py.pyRCV2.numbers.Num(10)}]])};')
	ctx.eval('let counter = {step_results: [result1, result2]};')
	
	ctx.eval('let tie = py.pyRCV2.ties.TiesForwards(counter);')
	assert ctx.eval('tie.choose_lowest(l) === l[0]')
	assert ctx.eval('tie.choose_highest(l) === l[2]')

def test_random_py():
	l = [
		(Candidate('A'), CountCard()),
		(Candidate('B'), CountCard()),
		(Candidate('C'), CountCard()),
	]
	t = TiesRandom('foobar') # first number is 0, second number is 0
	assert t.choose_lowest(l) == l[0]
	assert t.choose_highest(l) == l[0]

def test_random_js():
	ctx = tests.util.init_context()
	ctx.eval('let l = [[py.pyRCV2.model.Candidate("A"), py.pyRCV2.model.CountCard()], [py.pyRCV2.model.Candidate("B"), py.pyRCV2.model.CountCard()], [py.pyRCV2.model.Candidate("C"), py.pyRCV2.model.CountCard()]];')
	ctx.eval('let tie = py.pyRCV2.ties.TiesRandom("foobar")')
	assert ctx.eval('tie.choose_lowest(l) === l[0]')
	assert ctx.eval('tie.choose_highest(l) === l[0]')