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# This file is part of meas_base. 

# 

# Developed for the LSST Data Management System. 

# This product includes software developed by the LSST Project 

# (https://www.lsst.org). 

# See the COPYRIGHT file at the top-level directory of this distribution 

# for details of code ownership. 

# 

# 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 GNU General Public License 

# along with this program. If not, see <https://www.gnu.org/licenses/>. 

 

import unittest 

 

import numpy as np 

 

import lsst.geom 

import lsst.afw.geom as afwGeom 

import lsst.utils.tests as utilsTests 

 

# Rename the class on import so it does not confuse the test scanner 

from lsst.meas.base.tests import TestDataset as DatasetTester 

 

 

class TestDatasetTestCase(utilsTests.TestCase): 

 

def setUp(self): 

# Construct an arbitrary WCS for testing. 

crval = lsst.geom.SpherePoint(45.0, 45.0, lsst.geom.degrees) 

scale = 0.2*lsst.geom.arcseconds 

crpix = lsst.geom.PointD(100, 100) 

self.wcs = afwGeom.makeSkyWcs(crpix=crpix, crval=crval, 

cdMatrix=afwGeom.makeCdMatrix(scale=scale)) 

 

def tearDown(self): 

del self.wcs 

 

def test_perturb(self): 

"""Test that perturbing a WCS gives us back something different. 

""" 

# We should always get something different from our starting point. 

self.assertNotEqual(self.wcs, DatasetTester.makePerturbedWcs(self.wcs)) 

 

# If we use the same random seed, the results should be reproducible. 

self.assertEqual(DatasetTester.makePerturbedWcs(self.wcs, randomSeed=0), 

DatasetTester.makePerturbedWcs(self.wcs, randomSeed=0)) 

 

# If we specify different seeds, we should always get something 

# different. 

self.assertNotEqual(DatasetTester.makePerturbedWcs(self.wcs, randomSeed=1), 

DatasetTester.makePerturbedWcs(self.wcs, randomSeed=2)) 

 

def test_randomState(self): 

"""Test that we do not alter global state when perturbing the WCS. 

 

Notes 

----- 

This checks that global state doesn't change while the test is 

executing. This isn't perfectly robust: the test will fail if another 

thread manipulates the RNG state while this is executing. However, 

since pytest doesn't using multi-threading, it should be safe in 

practice. 

""" 

init_state = np.random.get_state() 

DatasetTester.makePerturbedWcs(self.wcs) 

for init, final in zip(init_state, np.random.get_state()): 

self.assertTrue(np.array_equal(init, final)) 

 

 

class TestMemory(utilsTests.MemoryTestCase): 

pass 

 

 

def setup_module(module): 

utilsTests.init() 

 

 

87 ↛ 88line 87 didn't jump to line 88, because the condition on line 87 was never trueif __name__ == "__main__": 

utilsTests.init() 

unittest.main()