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annotate src/testdir/test_random.vim @ 18703:aef98a646d3e v8.1.2343

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patch 8.1.2343: using time() for srand() is not very random Commit: https://github.com/vim/vim/commit/07e4a197953d12902fb97beb48830a5323a52280 Author: Bram Moolenaar <Bram@vim.org> Date: Tue Nov 26 12:23:30 2019 +0100 patch 8.1.2343: using time() for srand() is not very random Problem: Using time() for srand() is not very random. Solution: use /dev/urandom if available
author Bram Moolenaar <Bram@vim.org>
date Tue, 26 Nov 2019 12:30:04 +0100
parents 128662297ddf
children 2513e666aa82
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 " Tests for srand() and rand()
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2
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3 func Test_Rand()
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4 let r = srand(123456789)
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5 call assert_equal([123456789, 362436069, 521288629, 88675123], r)
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6 call assert_equal(3701687786, rand(r))
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7 call assert_equal(458299110, rand(r))
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8 call assert_equal(2500872618, rand(r))
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9 call assert_equal(3633119408, rand(r))
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10 call assert_equal(516391518, rand(r))
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11
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12 call test_settime(12341234)
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13 let s = srand()
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14 if filereadable('/dev/urandom')
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15 " using /dev/urandom
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16 call assert_notequal(s, srand())
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17 else
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18 " using time()
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19 call assert_equal(s, srand())
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20 call test_settime(12341235)
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21 call assert_notequal(s, srand())
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22 endif
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23
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24 call srand()
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25 let v = rand()
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26 call assert_notequal(v, rand())
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27
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28 call assert_fails('echo srand([1])', 'E745:')
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29 call assert_fails('echo rand([1, 2, 3])', 'E475:')
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30 call assert_fails('echo rand([[1], 2, 3, 4])', 'E475:')
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31 call assert_fails('echo rand([1, [2], 3, 4])', 'E475:')
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32 call assert_fails('echo rand([1, 2, [3], 4])', 'E475:')
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33 call assert_fails('echo rand([1, 2, 3, [4]])', 'E475:')
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34
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35 call test_settime(0)
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36 endfunc