3.Category的用法：测试用例分组，看看下面的代码和结果清楚了

using System;
using System.Text;
using NUnit.Framework;

namespace NUnitTest
{
    [TestFixture]
    public class CaculatorTest
    {
        private Caculator cac;
        private int a;
        private int b;

        /// <summary>
        /// 声明为TestFixtureSetUp的方法将在所有选中的TestCase调用之前调用，通常用来初始化数据库连接
        /// </summary>
        [TestFixtureSetUp]
        public void InitUtility()
        {
            Console.Write("Caculator Invoked!");
        }

        /// <summary>
        /// 声明为TestFixtureTearDown的方法将在所有选中的TestCase调用之后调用，通常用来销毁数据库连接
        /// </summary>
        [TestFixtureTearDown]
        public void DestroyUtility()
        {
            Console.Write("Caculator Destroy!");
        }

        [SetUp]
        public void Init()
        {
            cac = new Caculator();
            a = 10;
            b = 2;

            Console.Write("Data Init!");
        }

        [TearDown]
        public void Destroy()
        {
            Console.Write("TestCase Destroy!");
        }

        [Test]
        [Category("GroupA")]
        public void TestAdd()
        {
            int result = cac.Add(a， b);
            Assert.AreEqual(12， result);
        }

        [Test]
        [Category("GroupA")]
        public void TestMinus()
        {
            int result = cac.Substract(a， b);
            Assert.AreEqual(8， result);
        }

        [Test]
        [Category("GroupB")]
        public void TestMultip()
        {
            int result = cac.Multip(a， b);
            Assert.AreEqual(20， result);
        }

        [Test]
        [Category("GroupB")]
        public void TestDivide()
        {
            int result = cac.Divide(a， b);
            Assert.AreEqual(5， result);
        }
    }
}

运行结果：

若选中Exclude these Category，运行结果