test_chrono.py revision 12391:ceeca8b41e4b 
1from pybind11_tests import chrono as m
2import datetime
3
4
5def test_chrono_system_clock():
6
7    # Get the time from both c++ and datetime
8    date1 = m.test_chrono1()
9    date2 = datetime.datetime.today()
10
11    # The returned value should be a datetime
12    assert isinstance(date1, datetime.datetime)
13
14    # The numbers should vary by a very small amount (time it took to execute)
15    diff = abs(date1 - date2)
16
17    # There should never be a days/seconds difference
18    assert diff.days == 0
19    assert diff.seconds == 0
20
21    # We test that no more than about 0.5 seconds passes here
22    # This makes sure that the dates created are very close to the same
23    # but if the testing system is incredibly overloaded this should still pass
24    assert diff.microseconds < 500000
25
26
27def test_chrono_system_clock_roundtrip():
28    date1 = datetime.datetime.today()
29
30    # Roundtrip the time
31    date2 = m.test_chrono2(date1)
32
33    # The returned value should be a datetime
34    assert isinstance(date2, datetime.datetime)
35
36    # They should be identical (no information lost on roundtrip)
37    diff = abs(date1 - date2)
38    assert diff.days == 0
39    assert diff.seconds == 0
40    assert diff.microseconds == 0
41
42
43def test_chrono_duration_roundtrip():
44
45    # Get the difference between two times (a timedelta)
46    date1 = datetime.datetime.today()
47    date2 = datetime.datetime.today()
48    diff = date2 - date1
49
50    # Make sure this is a timedelta
51    assert isinstance(diff, datetime.timedelta)
52
53    cpp_diff = m.test_chrono3(diff)
54
55    assert cpp_diff.days == diff.days
56    assert cpp_diff.seconds == diff.seconds
57    assert cpp_diff.microseconds == diff.microseconds
58
59
60def test_chrono_duration_subtraction_equivalence():
61
62    date1 = datetime.datetime.today()
63    date2 = datetime.datetime.today()
64
65    diff = date2 - date1
66    cpp_diff = m.test_chrono4(date2, date1)
67
68    assert cpp_diff.days == diff.days
69    assert cpp_diff.seconds == diff.seconds
70    assert cpp_diff.microseconds == diff.microseconds
71
72
73def test_chrono_steady_clock():
74    time1 = m.test_chrono5()
75    assert isinstance(time1, datetime.timedelta)
76
77
78def test_chrono_steady_clock_roundtrip():
79    time1 = datetime.timedelta(days=10, seconds=10, microseconds=100)
80    time2 = m.test_chrono6(time1)
81
82    assert isinstance(time2, datetime.timedelta)
83
84    # They should be identical (no information lost on roundtrip)
85    assert time1.days == time2.days
86    assert time1.seconds == time2.seconds
87    assert time1.microseconds == time2.microseconds
88
89
90def test_floating_point_duration():
91    # Test using a floating point number in seconds
92    time = m.test_chrono7(35.525123)
93
94    assert isinstance(time, datetime.timedelta)
95
96    assert time.seconds == 35
97    assert 525122 <= time.microseconds <= 525123
98
99    diff = m.test_chrono_float_diff(43.789012, 1.123456)
100    assert diff.seconds == 42
101    assert 665556 <= diff.microseconds <= 665557
102