| Bram Moolenaar | 06b0b4b | 2019-11-25 15:40:55 +0100 | [diff] [blame] | 1 | " Tests for srand() and rand() |
| 2 | |
| 3 | func Test_Rand() |
| 4 | let r = srand(123456789) |
| 5 | call assert_equal([123456789, 362436069, 521288629, 88675123], r) |
| 6 | call assert_equal(3701687786, rand(r)) |
| 7 | call assert_equal(458299110, rand(r)) |
| 8 | call assert_equal(2500872618, rand(r)) |
| 9 | call assert_equal(3633119408, rand(r)) |
| 10 | call assert_equal(516391518, rand(r)) |
| 11 | |
| 12 | call test_settime(12341234) |
| 13 | let s = srand() |
| Bram Moolenaar | 07e4a19 | 2019-11-26 12:23:30 +0100 | [diff] [blame] | 14 | if filereadable('/dev/urandom') |
| 15 | " using /dev/urandom |
| 16 | call assert_notequal(s, srand()) |
| 17 | else |
| 18 | " using time() |
| 19 | call assert_equal(s, srand()) |
| 20 | call test_settime(12341235) |
| 21 | call assert_notequal(s, srand()) |
| 22 | endif |
| Bram Moolenaar | 06b0b4b | 2019-11-25 15:40:55 +0100 | [diff] [blame] | 23 | |
| 24 | call srand() |
| 25 | let v = rand() |
| 26 | call assert_notequal(v, rand()) |
| 27 | |
| 28 | call assert_fails('echo srand([1])', 'E745:') |
| 29 | call assert_fails('echo rand([1, 2, 3])', 'E475:') |
| 30 | call assert_fails('echo rand([[1], 2, 3, 4])', 'E475:') |
| 31 | call assert_fails('echo rand([1, [2], 3, 4])', 'E475:') |
| 32 | call assert_fails('echo rand([1, 2, [3], 4])', 'E475:') |
| 33 | call assert_fails('echo rand([1, 2, 3, [4]])', 'E475:') |
| Bram Moolenaar | 07e4a19 | 2019-11-26 12:23:30 +0100 | [diff] [blame] | 34 | |
| 35 | call test_settime(0) |
| Bram Moolenaar | 06b0b4b | 2019-11-25 15:40:55 +0100 | [diff] [blame] | 36 | endfunc |