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config.target = 'cxxrandom'

local rng = require('plugins.cxxrandom')

function test.cxxrandom_distributions()

rng.normal_distribution:new(0,5)

rng.real_distribution:new(-1,1)

rng.int_distribution:new(-20,20)

rng.bool_distribution:new(0.00000000001)

rng.num_sequence:new(-1000,1000)

-- no errors, no problem

end

--[[

The below tests pass with their given seeds, if they begin failing

for a given platform, or all around, new seeds should be found.

Note: these tests which assert RNG, are mere sanity checks

to ensure things haven't been severely broken by any changes

]]

function test.cxxrandom_seed()

local nd = rng.normal_distribution:new(0,500000)

local e1 = rng.MakeNewEngine(1)

local e2 = rng.MakeNewEngine(1)

local e3 = rng.MakeNewEngine(2)

local g1 = rng.crng:new(e1, true, nd)

local g2 = rng.crng:new(e2, true, nd)

local g3 = rng.crng:new(e3, true, nd)

local v1 = g1:next()

expect.eq(v1, g2:next())

expect.ne(v1, g3:next())

end

function test.cxxrandom_ranges()

local e1 = rng.MakeNewEngine(1)

local g1 = rng.crng:new(e1, true, rng.normal_distribution:new(0,1))

local g2 = rng.crng:new(e1, true, rng.real_distribution:new(-5,5))

local g3 = rng.crng:new(e1, true, rng.int_distribution:new(-5,5))

local g4 = rng.crng:new(e1, true, rng.num_sequence:new(-5,5))

for i = 1, 10 do

local a = g1:next()

local b = g2:next()

local c = g3:next()

local d = g4:next()

expect.ge(a, -5)

expect.ge(b, -5)

expect.ge(c, -5)

expect.ge(d, -5)

expect.le(a, 5)

expect.le(b, 5)

expect.le(c, 5)

expect.le(d, 5)

end

local gb = rng.crng:new(e1, true, rng.bool_distribution:new(0.00000000001))

for i = 1, 10 do

expect.false_(gb:next())

end

end

function test.cxxrandom_exports()

local id = rng.GenerateEngine(0)

rng.NewSeed(id, 2022)

expect.ge(rng.rollInt(id, 0, 1000), 0)

expect.ge(rng.rollDouble(id, 0, 1), 0)

expect.ge(rng.rollNormal(id, 5, 1), 0)

expect.true_(rng.rollBool(id, 0.9999999999))

local sid = rng.MakeNumSequence(0,8)

rng.AddToSequence(sid, 9)

rng.ShuffleSequence(sid, id)

for i = 1, 10 do

local v = rng.NextInSequence(sid)

expect.ge(v, 0)

expect.le(v, 9)

end

rng.DestroyNumSequence(sid)

rng.DestroyEngine(id)

end