Coverage for tests/test_time_utils.py : 17%

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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# (https://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 <https://www.gnu.org/licenses/>.
22"""Unit tests for methods in butler.time module.
23"""
25import unittest
27from astropy.time import Time, TimeDelta
28from lsst.daf.butler import time_utils
31class TimeTestCase(unittest.TestCase):
32 """A test case for time module
33 """
35 def test_time_before_epoch(self):
36 """Tests for before-the-epoch time.
37 """
38 time = Time("1950-01-01T00:00:00", format="isot", scale="tai")
39 value = time_utils.astropy_to_nsec(time)
40 self.assertEqual(value, 0)
42 value = time_utils.nsec_to_astropy(value)
43 self.assertEqual(value, time_utils.EPOCH)
45 def test_max_time(self):
46 """Tests for after-the-end-of-astronomy time.
47 """
48 # there are rounding issues, need more complex comparison
49 time = Time("2101-01-01T00:00:00", format="isot", scale="tai")
50 value = time_utils.astropy_to_nsec(time)
52 value_max = time_utils.astropy_to_nsec(time_utils.MAX_TIME)
53 self.assertEqual(value, value_max)
55 def test_round_trip(self):
56 """Test precision of round-trip conversion.
57 """
58 # do tests at random points between epoch and max. time
59 times = [
60 "1970-01-01T12:00:00.123",
61 "1999-12-31T23:59:57.123456",
62 "2000-01-01T12:00:00.123456",
63 "2030-01-01T12:00:00.123456789",
64 "2075-08-17T00:03:45",
65 "2099-12-31T23:00:50",
66 ]
67 for time in times:
68 atime = Time(time, format="isot", scale="tai")
69 for sec in range(7):
70 # loop over few seconds to add to each time
71 for i in range(100):
72 # loop over additional fractions of seconds
73 delta = sec + 0.3e-9 * i
74 in_time = atime + TimeDelta(delta, format="sec")
75 # do round-trip conversion to nsec and back
76 value = time_utils.astropy_to_nsec(in_time)
77 value = time_utils.nsec_to_astropy(value)
78 delta2 = value - in_time
79 delta2_sec = delta2.to_value("sec")
80 # absolute precision should be better than half
81 # nanosecond, but there are rounding errors too
82 self.assertLess(abs(delta2_sec), 0.51e-9)
84 def test_times_equal(self):
85 """Test for times_equal method
86 """
87 # time == time should always work
88 time1 = Time("2000-01-01T00:00:00.123456789", format="isot", scale="tai")
89 self.assertTrue(time_utils.times_equal(time1, time1))
91 # one nsec difference
92 time1 = Time("2000-01-01T00:00:00.123456789", format="isot", scale="tai")
93 time2 = Time("2000-01-01T00:00:00.123456788", format="isot", scale="tai")
94 self.assertTrue(time_utils.times_equal(time1, time2, 2.))
95 self.assertTrue(time_utils.times_equal(time2, time1, 2.))
96 self.assertFalse(time_utils.times_equal(time1, time2, .5))
97 self.assertFalse(time_utils.times_equal(time2, time1, .5))
99 # one nsec difference, times in UTC
100 time1 = Time("2000-01-01T00:00:00.123456789", format="isot", scale="utc")
101 time2 = Time("2000-01-01T00:00:00.123456788", format="isot", scale="utc")
102 self.assertTrue(time_utils.times_equal(time1, time2, 2.))
103 self.assertTrue(time_utils.times_equal(time2, time1, 2.))
104 self.assertFalse(time_utils.times_equal(time1, time2, .5))
105 self.assertFalse(time_utils.times_equal(time2, time1, .5))
107 # 1/2 nsec difference
108 time1 = Time("2000-01-01T00:00:00.123456789", format="isot", scale="tai")
109 time2 = time1 + TimeDelta(0.5e-9, format="sec")
110 self.assertTrue(time_utils.times_equal(time1, time2))
111 self.assertTrue(time_utils.times_equal(time2, time1))
112 self.assertFalse(time_utils.times_equal(time1, time2, .25))
113 self.assertFalse(time_utils.times_equal(time2, time1, .25))
115 # 1/2 microsec difference
116 time1 = Time("2000-01-01T00:00:00.123456789", format="isot", scale="tai")
117 time2 = time1 + TimeDelta(0.5e-6, format="sec")
118 self.assertTrue(time_utils.times_equal(time1, time2, 501))
119 self.assertTrue(time_utils.times_equal(time2, time1, 501))
120 self.assertFalse(time_utils.times_equal(time1, time2, 499))
121 self.assertFalse(time_utils.times_equal(time2, time1, 499))
124if __name__ == "__main__": 124 ↛ 125line 124 didn't jump to line 125, because the condition on line 124 was never true
125 unittest.main()