package queue

import "testing"

func TestCreateAndLength(t *testing.T) {
	q := &QueueNode{}
	q.Create(1, 2, 3)
	if got := q.Length(); got != 3 {
		t.Errorf("Length = %d, want 3", got)
	}
}

func TestPush(t *testing.T) {
	q := &QueueNode{}
	q.Create("a")
	q.Push("b")
	if got := q.Length(); got != 2 {
		t.Errorf("Push 后 Length = %d, want 2", got)
	}
}

func TestPop(t *testing.T) {
	q := &QueueNode{}
	q.Create(1, 2, 3)
	// Pop 在头结点（哨兵）上调用，跳过第一个元素并返回头结点 Data
	q.Pop()
	if got := q.Length(); got != 2 {
		t.Errorf("Pop 后 Length = %d, want 2", got)
	}
}

func TestCreateEmpty(t *testing.T) {
	q := &QueueNode{}
	q.Create() // 无元素，不应 panic
	if got := q.Length(); got != 0 {
		t.Errorf("空 Create 后 Length = %d, want 0", got)
	}
}

func TestPrint(t *testing.T) {
	q := &QueueNode{}
	q.Create(1, 2, 3)
	q.Print() // 仅验证不 panic
}