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1# This file is part of daf_butler. 

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 

22import unittest 

23import itertools 

24 

25import astropy.time 

26 

27from lsst.daf.butler import Timespan 

28 

29 

30class TimespanTestCase(unittest.TestCase): 

31 """Tests for the `Timespan` class. 

32 

33 Test coverage for the `DatabaseTimespanRepresentation` classes is handled 

34 by the tests for `Database` and its subclasses. 

35 """ 

36 

37 def setUp(self): 

38 start = astropy.time.Time('2020-01-01T00:00:00', format="isot", scale="tai") 

39 offset = astropy.time.TimeDelta(60, format="sec") 

40 self.timestamps = [start + offset*n for n in range(3)] 

41 self.timespans = [Timespan(begin=None, end=None)] 

42 self.timespans.extend(Timespan(begin=None, end=t) for t in self.timestamps) 

43 self.timespans.extend(Timespan(begin=t, end=None) for t in self.timestamps) 

44 self.timespans.extend(Timespan(begin=a, end=b) for a, b in itertools.combinations(self.timestamps, 2)) 

45 

46 def testStrings(self): 

47 """Test __str__ against expected values and __repr__ with eval 

48 round-tripping. 

49 """ 

50 for ts in self.timespans: 

51 # Uncomment the next line and run this test directly for the most 

52 # important test: human inspection. 

53 # print(str(ts), repr(ts)) 

54 self.assertIn(", ", str(ts)) 

55 self.assertTrue(str(ts).endswith(")")) 

56 if ts.begin is None: 

57 self.assertTrue(str(ts).startswith("(-∞, ")) 

58 else: 

59 self.assertTrue(str(ts).startswith(f"[{ts.begin}, ")) 

60 if ts.end is None: 

61 self.assertTrue(str(ts).endswith(", ∞)")) 

62 else: 

63 self.assertTrue(str(ts).endswith(f", {ts.end})")) 

64 self.assertEqual(eval(repr(ts)), ts) 

65 

66 def testOperationConsistency(self): 

67 """Test that overlaps, intersection, and difference are consistent. 

68 """ 

69 for a, b in itertools.combinations_with_replacement(self.timespans, 2): 

70 with self.subTest(a=str(a), b=str(b)): 

71 c1 = a.intersection(b) 

72 c2 = b.intersection(a) 

73 diffs1 = tuple(a.difference(b)) 

74 diffs2 = tuple(b.difference(a)) 

75 if a == b: 

76 self.assertFalse(diffs1) 

77 self.assertFalse(diffs2) 

78 else: 

79 for t in diffs1: 

80 self.assertTrue(a.overlaps(t)) 

81 self.assertFalse(b.overlaps(t)) 

82 for t in diffs2: 

83 self.assertTrue(b.overlaps(t)) 

84 self.assertFalse(a.overlaps(t)) 

85 self.assertEqual(c1, c2) 

86 if a.overlaps(b): 

87 self.assertTrue(b.overlaps(a)) 

88 self.assertIsNotNone(c1) 

89 else: 

90 self.assertFalse(b.overlaps(a)) 

91 self.assertIsNone(c1) 

92 self.assertEqual(diffs1, (a,)) 

93 self.assertEqual(diffs2, (b,)) 

94 

95 def testPrecision(self): 

96 """Test that we only use nanosecond precision for equality.""" 

97 ts1 = self.timespans[-1] 

98 ts2 = Timespan(begin=ts1.begin + astropy.time.TimeDelta(1e-10, format="sec"), end=ts1.end) 

99 self.assertEqual(ts1, ts2) 

100 

101 self.assertEqual(Timespan(begin=None, end=None), Timespan(begin=None, end=None)) 

102 self.assertEqual(Timespan(begin=None, end=ts1.end), Timespan(begin=None, end=ts1.end)) 

103 

104 ts2 = Timespan(begin=ts1.begin + astropy.time.TimeDelta(1e-8, format="sec"), end=ts1.end) 

105 self.assertNotEqual(ts1, ts2) 

106 

107 ts2 = Timespan(begin=None, end=ts1.end) 

108 self.assertNotEqual(ts1, ts2) 

109 

110 t1 = Timespan(begin=astropy.time.Time(2456461.0, val2=0.06580758101851847, format="jd", scale="tai"), 

111 end=astropy.time.Time(2456461.0, val2=0.06617994212962963, format="jd", scale="tai")) 

112 t2 = Timespan(begin=astropy.time.Time(2456461.0, val2=0.06580758101851858, format="jd", scale="tai"), 

113 end=astropy.time.Time(2456461.0, val2=0.06617994212962963, format="jd", scale="tai")) 

114 self.assertEqual(t1, t2) 

115 

116 # Ensure that == and != work properly 

117 self.assertTrue(t1 == t2, f"Equality of {t1} and {t2}") 

118 self.assertFalse(t1 != t2, f"Check != is false for {t1} and {t2}") 

119 

120 def testTimescales(self): 

121 """Test time scale conversion occurs on comparison.""" 

122 ts1 = Timespan(begin=astropy.time.Time('2013-06-17 13:34:45.775000', scale='tai', format='iso'), 

123 end=astropy.time.Time('2013-06-17 13:35:17.947000', scale='tai', format='iso')) 

124 ts2 = Timespan(begin=astropy.time.Time('2013-06-17T13:34:10.775', scale='utc', format='isot'), 

125 end=astropy.time.Time('2013-06-17T13:34:42.947', scale='utc', format='isot')) 

126 self.assertEqual(ts1, ts2, f"Compare {ts1} with {ts2}") 

127 

128 

129if __name__ == "__main__": 129 ↛ 130line 129 didn't jump to line 130, because the condition on line 129 was never true

130 unittest.main()