package rand_test

import (
	"testing"

	"apigo.cc/go/rand"
)

func TestGenericInt(t *testing.T) {
	// 1. 普通正数区间
	for range 100 {
		v := rand.Int(10, 20)
		if v < 10 || v > 20 { t.Errorf("Int failed: %d", v) }
	}

	// 2. 负数区间
	for range 100 {
		v := rand.Int(-50, -10)
		if v < -50 || v > -10 { t.Errorf("Negative range failed: %d", v) }
	}

	// 3. 防御性测试
	if rand.Int(100, 10) != 100 { t.Error("Reverse range should return min") }
}

func TestFastInt(t *testing.T) {
	for range 100 {
		v := rand.FastInt(1, 100)
		if v < 1 || v > 100 { t.Errorf("FastInt failed: %d", v) }
	}
}

func TestBytes(t *testing.T) {
	// 1. 正常长度
	bs := rand.Bytes(10)
	if len(bs) != 10 { t.Errorf("Expected length 10, got %d", len(bs)) }

	// 2. 边界长度
	if len(rand.Bytes(0)) != 0 { t.Error("Bytes(0) should return empty") }
	if len(rand.Bytes(-1)) != 0 { t.Error("Bytes(-1) should return empty") }

	// 3. 随机性简单验证 (不为空)
	bs1 := rand.Bytes(32)
	bs2 := rand.Bytes(32)
	if string(bs1) == string(bs2) { t.Error("Generated bytes should likely be different") }
}