BookStoreD/TestProject/UnitTest1.cs

using Microsoft.VisualStudio.TestTools.UnitTesting;
using BookStore;
using System;

namespace UnitTestProject
{
    [TestClass]
    public class UnitTest1
    {
        MainWindow wnd = new MainWindow();

        [TestMethod]
        public void InsertBtnTest()
        {
            string name = "Äåìèí è Äåäëàéí";
            string price = "5000";
            string author = "Êèðèëë Âàëåðüåâè÷ Áîðèñîâ";
            string category = "Âçðîñëûì";

            wnd.InsertBook();
        }
    }
}