Test1/UnitTestProject1/UnitTest1.cs

using Microsoft.VisualStudio.TestTools.UnitTesting;
using System;
using WindowsFormsApp1;

namespace UnitTestProject1
{
    
    [TestClass]
    public class UnitTest1
    {
        private Form1 form1;
        [TestInitialize]
        public void Setup()
        {
           form1 = new Form1();
        }
        [TestMethod]
        public void TestMethod1()
        {
            string res1 = "2131";
            bool result = form1.ANGLTEXT(res1);
            Assert.IsTrue(result);


        }
    }
}