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# LSST Data Management System 

# Copyright 2017 LSST Corporation. 

# 

# This product includes software developed by the 

# LSST Project (http://www.lsst.org/). 

# 

# This program is free software: you can redistribute it and/or modify 

# it under the terms of the GNU 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 General Public License for more details. 

# 

# You should have received a copy of the LSST License Statement and 

# the GNU General Public License along with this program. If not, 

# see <http://www.lsstcorp.org/LegalNotices/>. 

# 

 

from __future__ import division, print_function 

 

import unittest 

 

import lsst.utils 

 

from lsst.validate.drp import util 

 

 

class UtilCalculations(lsst.utils.tests.TestCase): 

"""Test utility functions.""" 

 

def testEllipticityHorizonalLine(self): 

"""Is util.ellipticity correct for a horizontal line.""" 

 

Ixx, Ixy, Iyy = 1, 0, 0 

exp_e, exp_e1, exp_e2 = 1+0j, 1, 0 

 

obs_e, obs_e1, obs_e2 = util.ellipticity(Ixx, Ixy, Iyy) 

self.assertFloatsAlmostEqual(exp_e, obs_e) 

self.assertFloatsAlmostEqual(exp_e1, obs_e1) 

self.assertFloatsAlmostEqual(exp_e2, obs_e2) 

 

def testEllipticityVerticalLine(self): 

"""Is util.ellipticity correct for a vertical line.""" 

 

Ixx, Ixy, Iyy = 0, 0, 1 

exp_e, exp_e1, exp_e2 = -1+0j, -1, 0 

 

obs_e, obs_e1, obs_e2 = util.ellipticity(Ixx, Ixy, Iyy) 

self.assertFloatsAlmostEqual(exp_e, obs_e) 

self.assertFloatsAlmostEqual(exp_e1, obs_e1) 

self.assertFloatsAlmostEqual(exp_e2, obs_e2) 

 

def testEllipticityDiagonalLine(self): 

"""Is util.ellipticity correct for a diagonal line.""" 

 

Ixx, Ixy, Iyy = 1, 1, 1 

exp_e, exp_e1, exp_e2 = 0.5+0.5j, 0.5, 0.5 

 

obs_e, obs_e1, obs_e2 = util.ellipticity(Ixx, Ixy, Iyy) 

print(obs_e, obs_e1, obs_e2) 

self.assertFloatsAlmostEqual(exp_e, obs_e) 

self.assertFloatsAlmostEqual(exp_e1, obs_e1) 

self.assertFloatsAlmostEqual(exp_e2, obs_e2) 

 

def testEllipticityCircle(self): 

"""Is util.ellipticity correct for a circle.""" 

 

Ixx, Ixy, Iyy = 1, 0, 1 

exp_e, exp_e1, exp_e2 = 0+0j, 0, 0 

 

obs_e, obs_e1, obs_e2 = util.ellipticity(Ixx, Ixy, Iyy) 

self.assertFloatsAlmostEqual(exp_e, obs_e) 

self.assertFloatsAlmostEqual(exp_e1, obs_e1) 

self.assertFloatsAlmostEqual(exp_e2, obs_e2) 

 

def testEllipticityEllipse(self): 

"""Is util.ellipticity correct for an ellipse.""" 

 

Ixx, Ixy, Iyy = 4, 0, 1 

exp_e, exp_e1, exp_e2 = 1/3+0j, 1/3, 0 

 

obs_e, obs_e1, obs_e2 = util.ellipticity(Ixx, Ixy, Iyy) 

self.assertFloatsAlmostEqual(exp_e, obs_e) 

self.assertFloatsAlmostEqual(exp_e1, obs_e1) 

self.assertFloatsAlmostEqual(exp_e2, obs_e2) 

 

 

def setup_module(module): 

lsst.utils.tests.init() 

 

 

95 ↛ 96line 95 didn't jump to line 96, because the condition on line 95 was never trueif __name__ == "__main__": 

lsst.utils.tests.init() 

unittest.main()