mirror of
https://github.com/mruby/mruby
synced 2026-06-08 16:11:16 +00:00
Yukihiro "Matz" Matsumoto
124 lines
3.0 KiB
Ruby
124 lines
3.0 KiB
Ruby
##
|
|
# Random Test
|
|
|
|
assert("Random.new") do
|
|
r1 = Random.new(123)
|
|
r2 = Random.new(123)
|
|
r3 = Random.new(124)
|
|
assert_equal(r1.rand, r2.rand)
|
|
assert_not_equal(r1.rand, r3.rand)
|
|
end
|
|
|
|
assert("Kernel.srand") do
|
|
srand(234)
|
|
r1 = rand
|
|
srand(234)
|
|
r2 = rand
|
|
srand(235)
|
|
r3 = rand
|
|
assert_equal(r1, r2)
|
|
assert_not_equal(r1, r3)
|
|
end
|
|
|
|
assert("Random.srand") do
|
|
Random.srand(345)
|
|
r1 = rand
|
|
srand(345)
|
|
r2 = Random.rand
|
|
Random.srand(346)
|
|
r3 = rand
|
|
assert_equal(r1, r2)
|
|
assert_not_equal(r1, r3)
|
|
end
|
|
|
|
assert("return class of Kernel.rand") do
|
|
assert_kind_of(Integer, rand(3))
|
|
assert_kind_of(Integer, rand(1.5))
|
|
skip unless Object.const_defined?(:Float)
|
|
assert_kind_of(Float, rand)
|
|
assert_kind_of(Float, rand(0.5))
|
|
end
|
|
|
|
assert("Array#shuffle") do
|
|
orig = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
|
|
ary = orig.dup
|
|
shuffled = ary.shuffle
|
|
assert_equal(orig, ary)
|
|
assert_not_equal(ary, shuffled)
|
|
assert_equal(orig, shuffled.sort)
|
|
end
|
|
|
|
assert('Array#shuffle!') do
|
|
orig = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
|
|
ary = orig.dup
|
|
assert_same(ary, ary.shuffle!)
|
|
assert_not_equal(orig, ary)
|
|
assert_equal(orig, ary.sort)
|
|
end
|
|
|
|
assert("Array#shuffle(random)") do
|
|
assert_raise(TypeError) do
|
|
# this will cause an exception due to the wrong argument
|
|
[1, 2].shuffle "Not a Random instance"
|
|
end
|
|
|
|
# verify that the same seed causes the same results
|
|
ary = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
|
|
shuffled1 = ary.shuffle Random.new 345
|
|
shuffled2 = ary.shuffle Random.new 345
|
|
shuffled3 = ary.shuffle Random.new 346
|
|
assert_equal(shuffled1, shuffled2)
|
|
assert_not_equal(shuffled1, shuffled3)
|
|
end
|
|
|
|
assert('Array#shuffle!(random)') do
|
|
assert_raise(TypeError) do
|
|
# this will cause an exception due to the wrong argument
|
|
[1, 2].shuffle! "Not a Random instance"
|
|
end
|
|
|
|
# verify that the same seed causes the same results
|
|
ary1 = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
|
|
ary1.shuffle! Random.new 345
|
|
ary2 = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
|
|
ary2.shuffle! Random.new 345
|
|
ary3 = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
|
|
ary3.shuffle! Random.new 346
|
|
assert_equal(ary1, ary2)
|
|
assert_not_equal(ary1, ary3)
|
|
end
|
|
|
|
assert('Array#sample') do
|
|
100.times do
|
|
assert_include([0, 1, 2], [2, 1, 0].sample)
|
|
[2, 1, 0].sample(2).each { |sample| assert_include([0, 1, 2], sample) }
|
|
h = {}
|
|
(1..10).to_a.sample(7).each do |sample|
|
|
assert_not_include(h, sample)
|
|
h[sample] = true
|
|
end
|
|
end
|
|
|
|
assert_nil([].sample)
|
|
assert_equal([], [].sample(1))
|
|
assert_equal([], [2, 1].sample(0))
|
|
assert_raise(TypeError) { [2, 1].sample(true) }
|
|
assert_raise(ArgumentError) { [2, 1].sample(-1) }
|
|
end
|
|
|
|
assert('Array#sample(random)') do
|
|
assert_raise(TypeError) do
|
|
# this will cause an exception due to the wrong argument
|
|
[1, 2].sample(2, "Not a Random instance")
|
|
end
|
|
|
|
# verify that the same seed causes the same results
|
|
ary = (1..10).to_a
|
|
srand(15)
|
|
samples1 = ary.sample(4)
|
|
samples2 = ary.sample(4, Random.new(15))
|
|
samples3 = ary.sample(4, Random.new(16))
|
|
assert_equal(samples1, samples2)
|
|
assert_not_equal(samples1, samples3)
|
|
end
|