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luatz/timetable: Fix incorrect math for negative carry operations
[etc/awesome.git] / spec / timetable_spec.lua
1 describe ( "Timetable library" , function ( )
2         local timetable = require "luatz.timetable"
3
4         local function native_normalise ( year , month , day )
5                 return os.date("*t",os.time{
6                         year = year ;
7                         month = month ;
8                         day = day ;
9                 })
10         end
11
12         it ( "#is_leap is correct" , function ( )
13                 assert.same ( false , timetable.is_leap ( 1 ) )
14                 assert.same ( false , timetable.is_leap ( 3 ) )
15                 assert.same ( true  , timetable.is_leap ( 4 ) )
16                 assert.same ( true  , timetable.is_leap ( 2000 ) )
17                 assert.same ( true  , timetable.is_leap ( 2004 ) )
18                 assert.same ( true  , timetable.is_leap ( 2012 ) )
19                 assert.same ( false , timetable.is_leap ( 2013 ) )
20                 assert.same ( false , timetable.is_leap ( 2014 ) )
21                 assert.same ( false , timetable.is_leap ( 2100 ) )
22                 assert.same ( true  , timetable.is_leap ( 2400 ) )
23         end )
24
25         it ( "#normalise gets #wday (day of week) correct" , function ( )
26
27                 local function assert_same_wday ( year , month , day )
28                         return assert.are.same (
29                                 native_normalise ( year , month , day ).wday ,
30                                 timetable.new ( year , month , day ):normalise().wday
31                         )
32                 end
33
34                 assert_same_wday ( 2013 , 7 , 23 )
35                 assert_same_wday ( 2013 , 7 , 24 )
36                 assert_same_wday ( 2013 , 7 , 25 )
37                 assert_same_wday ( 2013 , 7 , 26 )
38                 assert_same_wday ( 2013 , 7 , 27 )
39                 assert_same_wday ( 2013 , 7 , 28 )
40                 assert_same_wday ( 2013 , 7 , 29 )
41                 assert_same_wday ( 2014 , 1 , 1 )
42                 assert_same_wday ( 2014 , 1 , 6 )
43                 assert_same_wday ( 2016 , 2 , 28 )
44                 assert_same_wday ( 2016 , 2 , 29 )
45                 assert_same_wday ( 2016 , 3 , 1 )
46         end )
47
48         local function native_timestamp ( year , month , day )
49                 return assert ( tonumber ( assert ( io.popen (
50                                                 string.format('date -u -d "%d-%d-%d" +%%s', year , month , day )
51                                         ) ):read "*l" ) )
52         end
53
54         it ( "#timestamp creation is valid" , function ( )
55                 for y=1950,2013 do
56                         for m=1,12 do
57                                 assert.same ( native_timestamp ( y,m,1 ) , timetable.timestamp(y,m,1,0,0,0) )
58                         end
59                 end
60         end )
61
62         it ( "#normalise handles out of range days in a year" , function ( )
63                 assert.same({ 2014,1,1,0,0,0 }, { timetable.normalise(2013,1,366,0,0,0) })
64                 assert.same({ 2014,2,4,0,0,0 }, { timetable.normalise(2013,1,400,0,0,0) })
65                 assert.same({ 2017,2,3,0,0,0 }, { timetable.normalise(2016,1,400,0,0,0) })
66                 assert.same({ 2016,3,5,0,0,0 }, { timetable.normalise(2015,1,430,0,0,0) })
67                 assert.same({ 2017,3,5,0,0,0 }, { timetable.normalise(2016,1,430,0,0,0) })
68                 assert.same({ 2027,5,18,0,0,0 }, { timetable.normalise(2000,1,10000,0,0,0) })
69                 assert.same({ 29379,1,25,0,0,0 }, { timetable.normalise(2000,1,10000000,0,0,0) })
70         end )
71
72         it ( "#normalise handles out of range days in a #month" , function ( )
73                 assert.same({ 2012,12,1,0,0,0 }, { timetable.normalise(2013,0,1,0,0,0) })
74                 assert.same({ 2016,6,1,0,0,0 }, { timetable.normalise(2013,42,1,0,0,0) })
75
76                 -- Correct behaviour around leap days
77                 assert.same({ 2012,3,23,0,0,0 }, { timetable.normalise(2012,2,52,0,0,0) })
78                 assert.same({ 2013,3,24,0,0,0 }, { timetable.normalise(2013,2,52,0,0,0) })
79
80                 assert.same({ 2012,2,26,0,0,0 }, { timetable.normalise(2012,3,-2,0,0,0) })
81                 assert.same({ 2013,2,27,0,0,0 }, { timetable.normalise(2013,3,-2,0,0,0) })
82
83                 -- Also when more fields are out of range
84                 assert.same({ 2016,7,22,0,0,0 }, { timetable.normalise(2013,42,52,0,0,0) })
85                 assert.same({ 2016,7,24,2,0,0 }, { timetable.normalise(2013,42,52,50,0,0) })
86         end )
87
88         it ( "#normalise handles fractional #month" , function ( )
89                 assert.same({ 2015,2,15,0,0,0 } , { timetable.normalise(2014,14.5,1,0,0,0) })
90                 assert.same({ 2016,2,15,12,0,0 } , { timetable.normalise(2015,14.5,1,0,0,0) }) -- leap year, so hours is 12
91                 assert.same({ 2017,2,15,0,0,0 } , { timetable.normalise(2016,14.5,1,0,0,0) })
92         end )
93
94         it ( "#normalise handles negative carry (issue #10)", function()
95                 assert.same({ 1970,01,01,00,59,00 }, { timetable.normalise(1970,01,01,01,00,-60) })
96                 assert.same({ 1970,01,01,00,58,58 }, { timetable.normalise(1970,01,01,01,00,-62) })
97                 assert.same({ 1969,12,31,23,55,58 }, { timetable.normalise(1970,01,01,01,-63,-62) })
98                 assert.same({ 2017,02,3,0,0,0 }, { timetable.normalise(2017,02,13,0,-14400,0) })
99         end )
100
101         local function round_trip_add(t, field, x)
102                 local before = t:clone()
103                 t[field]=t[field]+x;
104                 t:normalise();
105                 t[field]=t[field]-x;
106                 t:normalise();
107                 assert.same(0, t-before)
108         end
109         it ( "#normalise round trips" , function ( )
110                 round_trip_add(timetable.new(2000,2,28,0,0,0), "month", 0.5)
111                 round_trip_add(timetable.new(2014,8,28,19,23,0), "month", 0.4)
112                 round_trip_add(timetable.new(2014,14.5,28,0,0,0), "month", 0.4)
113         end )
114
115         it("#rfc_3339 works with fractional milliseconds", function()
116                 -- on lua 5.3 this used to throw an error due to milliseconds not being an integer
117                 timetable.new_from_timestamp(1415141759.999911111):rfc_3339()
118         end)
119
120         it("#rfc_3339 doesn't round seconds up to 60 (issue #4)", function()
121                 assert.same("2014-11-04T22:55:59.999", timetable.new_from_timestamp(1415141759.999911111):rfc_3339())
122                 assert.same("1970-01-01T00:00:59.999", timetable.new_from_timestamp(59.9999999):rfc_3339())
123                 assert.same("1969-12-31T23:59:59.999", timetable.new_from_timestamp(-0.001):rfc_3339())
124                 assert.same("1969-12-31T23:59:00.000", timetable.new_from_timestamp(-59.9999999):rfc_3339())
125         end)
126 end )