package arena_test

import (
	"testing"

	"git.brut.systems/judah/xx/arena"
	"git.brut.systems/judah/xx/mem"
	"git.brut.systems/judah/xx/testx"
)

func TestMakeSlice(t *testing.T) {
	a := arena.Linear(1024 * mem.Kilobyte)
	defer arena.Reset(a)

	s := arena.MakeSlice[int](a, 99, 100)
	testx.Expect(t, len(s) == 99, "len = %d, expected 99", len(s))
	testx.Expect(t, cap(s) == 100, "cap = %d, expected 100", cap(s))

	p := &s[0]

	s[2] = 0xCAFE_DECAF
	s = append(s, 2)

	testx.Expect(t, p == &s[0], "p = %p, expected %p", p, &s[0])

	p = &s[0]
	s = append(s, 3) // cause a reallocation

	testx.Expect(t, p != &s[0], "p = %p, expected %p", p, &s[0])
}