Unit тест для метода - C#

public int Summ(string s)
{
return s.Split(new []{','}, StringSplitOptions.RemoveEmptyEntries)
.Take(2)
.Select(i =>int.Parse(i))
.Sum();
 
}

[TestMethod]
public void TestMethod1()
{
var calc = new SimpleCalculator();
Random random = new Random();
int a = random.Next(0, 10000);
int b = random.Next(0, 10000);
var arr = new [] {b, a};
int expected = arr.Sum();
int result = calc.Summ(arr.ToString());
Assert.AreEqual(expected,result);

var calc = new SimpleCalculator();
            Random rand = new Random();
            int first = rand.Next(0, 100000);
            int second = rand.Next(0, 100000);
            int result = first + second;
            string[] str = new[] { first.ToString(), second.ToString() };
            Assert.AreEqual(result,str);