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1# This file is part of <REPLACE WHEN RENAMED>. 

2# 

3# Developed for the LSST Data Management System. 

4# This product includes software developed by the LSST Project 

5# (http://www.lsst.org). 

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

7# for details of code ownership. 

8# 

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

10# it under the terms of the GNU General Public License as published by 

11# the Free Software Foundation, either version 3 of the License, or 

12# (at your option) any later version. 

13# 

14# This program is distributed in the hope that it will be useful, 

15# but WITHOUT ANY WARRANTY; without even the implied warranty of 

16# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 

17# GNU General Public License for more details. 

18# 

19# You should have received a copy of the GNU General Public License 

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

21 

22"""Unit tests for the metrics measurement system. 

23""" 

24 

25import unittest 

26import os 

27import numpy as np 

28import astropy.units as u 

29 

30from lsst.utils import getPackageDir 

31import lsst.pipe.base as pipeBase 

32from lsst.afw.table import SimpleCatalog, GroupView 

33from lsst.faro.utils.phot_repeat import (calcPhotRepeat, 

34 calcPhotRepeatSample, 

35 computeWidths, 

36 getRandomDiffRmsInMmags, 

37 getRandomDiff) 

38 

39 

40DATADIR = os.path.join(getPackageDir('faro'), 'tests', 'data') 

41 

42 

43class PhotUtilTest(unittest.TestCase): 

44 """Test photometric utility functions.""" 

45 

46 def load_data(self): 

47 '''Helper to load data to process.''' 

48 cat_file = 'matchedCatalogTract_0_i.fits.gz' 

49 catalog = SimpleCatalog.readFits(os.path.join(DATADIR, cat_file)) 

50 matches = GroupView.build(catalog) 

51 

52 magKey = matches.schema.find('slot_PsfFlux_mag').key 

53 nMatchesRequired = 2 

54 

55 def nMatchFilter(cat): 

56 if len(cat) < nMatchesRequired: 

57 return False 

58 return np.isfinite(cat.get(magKey)).all() 

59 

60 return matches.where(nMatchFilter), magKey 

61 

62 def test_calcPhotRepeat(self): 

63 """Test photometric repeatability for multiple realizations 

64 of random pairs of visits.""" 

65 # Ensure measurements are deterministic 

66 seed = 8675309 

67 

68 expected = 72.79576602821936 * u.mmag 

69 matches, magKey = self.load_data() 

70 result = calcPhotRepeat(matches, magKey, randomSeed=seed) 

71 self.assertEqual(result['repeatability'], expected) 

72 

73 def test_calcPhotRepeatSample(self): 

74 """Test photometric repeatability for one realization 

75 of random pairs of visits.""" 

76 # Ensure measurements are deterministic 

77 seed = 8675309 

78 rng = np.random.default_rng(seed) 

79 

80 expected = pipeBase.Struct(rms=168.09034424742475, 

81 iqr=72.11774706688344) 

82 matches, magKey = self.load_data() 

83 result = calcPhotRepeatSample(matches, magKey, rng=rng) 

84 self.assertEqual(result.rms, expected.rms) 

85 self.assertEqual(result.iqr, expected.iqr) 

86 

87 def test_computeWidths(self): 

88 """Test RMS and the scaled inter-quartile range calculation.""" 

89 expected = (22.54717277176897, 1.8532527731320025) 

90 mag = np.linspace(20, 25, 101) 

91 result = computeWidths(mag) 

92 self.assertEqual(result[0], expected[0]) 

93 self.assertEqual(result[1], expected[1]) 

94 

95 def test_getRandomDiffRmsInMmags(self): 

96 """Test random sampling of magnitude diffs.""" 

97 # Ensure measurements are deterministic 

98 seed = 8675309 

99 rng = np.random.default_rng(seed) 

100 

101 expected = -1237.436867076458 

102 mag = np.linspace(20, 25, 101) 

103 result = getRandomDiffRmsInMmags(mag, rng=rng) 

104 self.assertEqual(result, expected) 

105 

106 def test_getRandomDiff(self): 

107 """Test one random diff""" 

108 # Ensure measurements are deterministic 

109 seed = 8675309 

110 rng = np.random.default_rng(seed) 

111 

112 expected = -1.75 

113 mag = np.linspace(20, 25, 101) 

114 result = getRandomDiff(mag, rng=rng) 

115 self.assertEqual(result, expected) 

116 

117 

118if __name__ == "__main__": 118 ↛ 119line 118 didn't jump to line 119, because the condition on line 118 was never true

119 unittest.main()