mirror of
https://github.com/ruby/ruby.git
synced 2022-11-09 12:17:21 -05:00
429 lines
10 KiB
Ruby
429 lines
10 KiB
Ruby
# frozen_string_literal: false
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require 'test/unit'
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class TestRand < Test::Unit::TestCase
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def assert_random_int(m, init = 0, iterate: 5)
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srand(init)
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rnds = [Random.new(init)]
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rnds2 = [rnds[0].dup]
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rnds3 = [rnds[0].dup]
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iterate.times do |i|
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w = rand(m)
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rnds.each do |rnd|
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assert_equal(w, rnd.rand(m))
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end
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rnds2.each do |rnd|
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r=rnd.rand(i...(m+i))
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assert_equal(w+i, r)
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end
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rnds3.each do |rnd|
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r=rnd.rand(i..(m+i-1))
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assert_equal(w+i, r)
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end
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rnds << Marshal.load(Marshal.dump(rnds[-1]))
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rnds2 << Marshal.load(Marshal.dump(rnds2[-1]))
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end
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end
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def test_mt
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assert_random_int(0x100000000, 0x00000456_00000345_00000234_00000123)
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end
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def test_0x3fffffff
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assert_random_int(0x3fffffff)
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end
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def test_0x40000000
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assert_random_int(0x40000000)
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end
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def test_0x40000001
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assert_random_int(0x40000001)
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end
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def test_0xffffffff
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assert_random_int(0xffffffff)
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end
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def test_0x100000000
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assert_random_int(0x100000000)
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end
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def test_0x100000001
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assert_random_int(0x100000001)
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end
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def test_rand_0x100000000
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assert_random_int(0x100000001, 311702798)
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end
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def test_0x1000000000000
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assert_random_int(0x1000000000000)
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end
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def test_0x1000000000001
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assert_random_int(0x1000000000001)
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end
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def test_0x3fffffffffffffff
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assert_random_int(0x3fffffffffffffff)
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end
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def test_0x4000000000000000
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assert_random_int(0x4000000000000000)
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end
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def test_0x4000000000000001
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assert_random_int(0x4000000000000001)
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end
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def test_0x10000000000
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assert_random_int(0x10000000000, 3)
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end
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def test_0x10000
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assert_random_int(0x10000)
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end
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def assert_same_numbers(type, *nums)
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nums.each do |n|
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assert_instance_of(type, n)
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end
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x = nums.shift
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nums.each do |n|
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assert_equal(x, n)
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end
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x
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end
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def test_types
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o = Object.new
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class << o
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def to_int; 100; end
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def class; Integer; end
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end
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srand(0)
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nums = [100.0, (2**100).to_f, (2**100), o, o, o].map do |m|
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k = Integer
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assert_kind_of(k, x = rand(m), m.inspect)
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[m, k, x]
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end
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assert_kind_of(Integer, rand(-(2**100).to_f))
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srand(0)
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rnd = Random.new(0)
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rnd2 = Random.new(0)
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nums.each do |m, k, x|
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assert_same_numbers(m.class, Random.rand(m), rnd.rand(m), rnd2.rand(m))
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end
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end
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def test_srand
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srand
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assert_kind_of(Integer, rand(2))
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assert_kind_of(Integer, Random.new.rand(2))
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srand(2**100)
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rnd = Random.new(2**100)
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r = 3.times.map do
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assert_same_numbers(Integer, rand(0x100000000), rnd.rand(0x100000000))
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end
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srand(2**100)
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r.each do |n|
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assert_same_numbers(Integer, n, rand(0x100000000))
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end
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end
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def test_shuffle
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srand(0)
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result = [*1..5].shuffle
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assert_equal([*1..5], result.sort)
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assert_equal(result, [*1..5].shuffle(random: Random.new(0)))
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end
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def test_big_seed
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assert_random_int(0x100000000, 2**1000000-1)
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end
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def test_random_gc
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r = Random.new(0)
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3.times do
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assert_kind_of(Integer, r.rand(0x100000000))
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end
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GC.start
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3.times do
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assert_kind_of(Integer, r.rand(0x100000000))
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end
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end
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def test_random_type_error
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assert_raise(TypeError) { Random.new(Object.new) }
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assert_raise(TypeError) { Random.new(0).rand(Object.new) }
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end
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def test_random_argument_error
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r = Random.new(0)
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assert_raise(ArgumentError) { r.rand(0, 0) }
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assert_raise(ArgumentError, '[ruby-core:24677]') { r.rand(-1) }
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assert_raise(ArgumentError, '[ruby-core:24677]') { r.rand(-1.0) }
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assert_raise(ArgumentError, '[ruby-core:24677]') { r.rand(0) }
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assert_equal(0, r.rand(1), '[ruby-dev:39166]')
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assert_equal(0, r.rand(0...1), '[ruby-dev:39166]')
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assert_equal(0, r.rand(0..0), '[ruby-dev:39166]')
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assert_equal(0.0, r.rand(0.0..0.0), '[ruby-dev:39166]')
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assert_raise(ArgumentError, '[ruby-dev:39166]') { r.rand(0...0) }
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assert_raise(ArgumentError, '[ruby-dev:39166]') { r.rand(0..-1) }
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assert_raise(ArgumentError, '[ruby-dev:39166]') { r.rand(0.0...0.0) }
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assert_raise(ArgumentError, '[ruby-dev:39166]') { r.rand(0.0...-0.1) }
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bug3027 = '[ruby-core:29075]'
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assert_raise(ArgumentError, bug3027) { r.rand(nil) }
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end
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def test_random_seed
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assert_equal(0, Random.new(0).seed)
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assert_equal(0x100000000, Random.new(0x100000000).seed)
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assert_equal(2**100, Random.new(2**100).seed)
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end
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def test_random_dup
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r1 = Random.new(0)
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r2 = r1.dup
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3.times do
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assert_same_numbers(Integer, r1.rand(0x100000000), r2.rand(0x100000000))
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end
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r2 = r1.dup
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3.times do
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assert_same_numbers(Integer, r1.rand(0x100000000), r2.rand(0x100000000))
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end
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end
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def test_random_bytes
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srand(0)
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r = Random.new(0)
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assert_equal("", r.bytes(0))
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assert_equal("", Random.bytes(0))
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x = r.bytes(1)
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assert_equal(1, x.bytesize)
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assert_equal(x, Random.bytes(1))
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x = r.bytes(10)
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assert_equal(10, x.bytesize)
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assert_equal(x, Random.bytes(10))
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end
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def test_random_range
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srand(0)
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r = Random.new(0)
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now = Time.now
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[5..9, -1000..1000, 2**100+5..2**100+9, 3.1..4, now..(now+2)].each do |range|
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3.times do
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x = rand(range)
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assert_instance_of(range.first.class, x)
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assert_equal(x, r.rand(range))
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assert_include(range, x)
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end
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end
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end
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def test_random_float
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r = Random.new(0)
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3.times do
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assert_include(0...1.0, r.rand)
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end
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[2.0, (2**100).to_f].each do |x|
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range = 0...x
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3.times do
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assert_include(range, r.rand(x), "rand(#{x})")
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end
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end
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assert_raise(Errno::EDOM, Errno::ERANGE) { r.rand(1.0 / 0.0) }
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assert_raise(Errno::EDOM, Errno::ERANGE) { r.rand(0.0 / 0.0) }
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assert_raise(Errno::EDOM) {r.rand(1..)}
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assert_raise(Errno::EDOM) {r.rand(..1)}
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r = Random.new(0)
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[1.0...2.0, 1.0...11.0, 2.0...4.0].each do |range|
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3.times do
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assert_include(range, r.rand(range), "[ruby-core:24655] rand(#{range})")
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end
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end
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assert_nothing_raised {r.rand(-Float::MAX..Float::MAX)}
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end
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def test_random_equal
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r = Random.new(0)
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assert_equal(r, r)
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assert_equal(r, r.dup)
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r1 = r.dup
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r2 = r.dup
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r1.rand(0x100)
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assert_not_equal(r1, r2)
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r2.rand(0x100)
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assert_equal(r1, r2)
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end
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def test_fork_shuffle
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pid = fork do
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(1..10).to_a.shuffle
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raise 'default seed is not set' if srand == 0
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end
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_, st = Process.waitpid2(pid)
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assert_predicate(st, :success?, "#{st.inspect}")
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rescue NotImplementedError, ArgumentError
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end
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def assert_fork_status(n, mesg, &block)
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IO.pipe do |r, w|
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(1..n).map do
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st = desc = nil
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IO.pipe do |re, we|
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p1 = fork {
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re.close
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STDERR.reopen(we)
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w.puts(block.call.to_s)
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}
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we.close
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err = Thread.start {re.read}
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_, st = Process.waitpid2(p1)
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desc = FailDesc[st, mesg, err.value]
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end
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assert(!st.signaled?, desc)
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assert(st.success?, mesg)
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r.gets.strip
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end
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end
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end
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def test_rand_reseed_on_fork
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GC.start
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bug5661 = '[ruby-core:41209]'
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assert_fork_status(1, bug5661) {Random.rand(4)}
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r1, r2 = *assert_fork_status(2, bug5661) {Random.rand}
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assert_not_equal(r1, r2, bug5661)
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assert_fork_status(1, bug5661) {rand(4)}
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r1, r2 = *assert_fork_status(2, bug5661) {rand}
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assert_not_equal(r1, r2, bug5661)
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stable = Random.new
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assert_fork_status(1, bug5661) {stable.rand(4)}
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r1, r2 = *assert_fork_status(2, bug5661) {stable.rand}
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assert_equal(r1, r2, bug5661)
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assert_fork_status(1, '[ruby-core:82100] [Bug #13753]') do
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Random::DEFAULT.rand(4)
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end
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rescue NotImplementedError
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end
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def test_seed
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bug3104 = '[ruby-core:29292]'
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rand_1 = Random.new(-1).rand
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assert_not_equal(rand_1, Random.new((1 << 31) -1).rand, "#{bug3104} (2)")
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assert_not_equal(rand_1, Random.new((1 << 63) -1).rand, "#{bug3104} (2)")
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[-1, -2**10, -2**40].each {|n|
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b = (2**64).coerce(n)[0]
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r1 = Random.new(n).rand
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r2 = Random.new(b).rand
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assert_equal(r1, r2)
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}
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end
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def test_marshal
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bug3656 = '[ruby-core:31622]'
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assert_raise(TypeError, bug3656) {
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Random.new.__send__(:marshal_load, 0)
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}
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end
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def test_initialize_frozen
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r = Random.new(0)
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r.freeze
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assert_raise(FrozenError, '[Bug #6540]') do
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r.__send__(:initialize, r)
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end
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end
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def test_marshal_load_frozen
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r = Random.new(0)
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d = r.__send__(:marshal_dump)
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r.freeze
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assert_raise(FrozenError, '[Bug #6540]') do
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r.__send__(:marshal_load, d)
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end
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end
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def test_random_ulong_limited
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def (gen = Object.new).rand(*) 1 end
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assert_equal([2], (1..100).map {[1,2,3].sample(random: gen)}.uniq)
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def (gen = Object.new).rand(*) 100 end
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assert_raise_with_message(RangeError, /big 100\z/) {[1,2,3].sample(random: gen)}
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bug7903 = '[ruby-dev:47061] [Bug #7903]'
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def (gen = Object.new).rand(*) -1 end
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assert_raise_with_message(RangeError, /small -1\z/, bug7903) {[1,2,3].sample(random: gen)}
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bug7935 = '[ruby-core:52779] [Bug #7935]'
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class << (gen = Object.new)
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def rand(limit) @limit = limit; 0 end
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attr_reader :limit
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end
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[1, 2].sample(1, random: gen)
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assert_equal(2, gen.limit, bug7935)
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end
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def test_random_ulong_limited_no_rand
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c = Class.new do
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undef rand
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def bytes(n)
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"\0"*n
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end
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end
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gen = c.new.extend(Random::Formatter)
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assert_equal(1, [1, 2].sample(random: gen))
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end
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def test_default_seed
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assert_separately([], "#{<<~"begin;"}\n#{<<~'end;'}")
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begin;
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verbose, $VERBOSE = $VERBOSE, nil
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seed = Random::DEFAULT::seed
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rand1 = Random::DEFAULT::rand
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$VERBOSE = verbose
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rand2 = Random.new(seed).rand
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assert_equal(rand1, rand2)
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srand seed
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rand3 = rand
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assert_equal(rand1, rand3)
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end;
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end
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def test_urandom
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[0, 1, 100].each do |size|
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v = Random.urandom(size)
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assert_kind_of(String, v)
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assert_equal(size, v.bytesize)
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end
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end
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def test_new_seed
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size = 0
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n = 8
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n.times do
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v = Random.new_seed
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assert_kind_of(Integer, v)
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size += v.size
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end
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# probability of failure <= 1/256**8
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assert_operator(size.fdiv(n), :>, 15)
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end
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end
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