package api

import (
	"net"
	"testing"
)

func TestFindAvailableOIDCPortSkipsReservedAndOccupied(t *testing.T) {
	listener, err := net.Listen("tcp", "127.0.0.1:0")
	if err != nil {
		t.Skipf("当前环境不允许监听回环端口: %v", err)
	}
	defer listener.Close()
	occupied := listener.Addr().(*net.TCPAddr).Port
	if occupied < 1024 || occupied > 65533 {
		t.Skip("系统分配的临时端口无法用于递增测试")
	}
	reserved := map[int]bool{occupied + 1: true}
	if loopbackTCPAvailable(occupied) {
		t.Fatal("监听中的端口必须视为占用")
	}
	available := func(port int) bool { return port != occupied }
	port, ok := findAvailableOIDCPort(occupied, 1, reserved, available)
	if !ok || port != occupied+2 {
		t.Fatalf("递增应跳过已监听及已配置的端口，得到 %d (ok=%t)", port, ok)
	}
	port, ok = findAvailableOIDCPort(occupied+1, -1, reserved, available)
	if !ok || port != occupied-1 {
		t.Fatalf("递减应跳过已配置及已监听的端口，得到 %d (ok=%t)", port, ok)
	}
}