Sample Nunit test class with C#

using System.Text;
using NUnit.Framework;

namespace Test.SampleTests
{
    [TestFixture]
    public class CustomerTestClass
    {
        [TestCase(1, true)] // valid customer
        [TestCase(2, true)] // valid customer
        [TestCase(1123123123132, false)] // invlaid customer
        public void IsValidCustomerTest(int customerId, bool isValid)
        {
            Assert.AreEqual(_service.ValidateCust(customerId), isValid);
        }
    }
}