#   scipy-yli: Helpful SciPy utilities and recipes
#   Copyright © 2022–2023  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/>.

from pytest import approx

import pandas as pd

import yli

def test_turnbull_simple():
	"""Compare yli.turnbull for simple example"""
	
	df = pd.DataFrame({
		'Time_L': [0.5, 1, 3, 5],
		'Time_R': [2.5, 2, 4, 6]
	})
	
	xpoints, ypoints, _, _ = yli.survival.calc_survfunc_turnbull(df['Time_L'], df['Time_R'], ci=False)
	
	assert xpoints[0] == 0
	assert ypoints[0] == 1
	
	assert xpoints[1] == approx(1.5)
	assert ypoints[1] == 1
	
	assert xpoints[2] == approx(1.5)
	assert ypoints[2] == 0.5
	
	assert xpoints[3] == approx(3.5)
	assert ypoints[3] == 0.5
	
	assert xpoints[4] == approx(3.5)
	assert ypoints[4] == 0.25
	
	assert xpoints[5] == approx(5.5)
	assert ypoints[5] == 0.25
	
	assert xpoints[6] == approx(5.5)
	assert ypoints[6] == 0