{C#-05D} 单测.CallBase

背景

• 替换方法|函数|属性，范围涉及默认|全部|全不|定向。

代码

using Moq;
using System.Data;
using System.Diagnostics;
using Xunit;

namespace CallBack
{
    public class Builder
    {
        // 交互(方法)
        public virtual void Interact(string content)
        {
            Debug.Print(content);
        }

        // 数据(函数)
        public virtual DataTable GetData()
        {
            var result = new DataTable();
            result.Columns.Add("id", typeof(int));

            result.Rows.Add(1);

            return result;
        }
    }

    public class BuilderTests
    {
        private const int
            realTableRows = 1,
            mockTableRows = 2;

        // 默认CallBase = false
        private Mock<Builder> mock = new Mock<Builder>();

        [Fact(DisplayName = "默认")]
        public void ExecuteDefault_ReturnsNull()
        {
            mock.Object.Interact("default");

            var actual = mock.Object.GetData();
            Assert.Null(actual);
        }

        [Fact(DisplayName = "全不重写")]
        public void NotOverride_ReturnsTrue()
        {
            mock.CallBase = true;
            mock.Object.Interact("default"); // 打印default

            int count = mock.Object.GetData().Rows.Count;
            Assert.True(count == realTableRows);
        }

        [Fact(DisplayName = "全重写")]
        public void OverrideAll_ReturnsTrue()
        {
            mock.Setup(x => x.Interact(It.IsAny<string>())); // 空方法，效果同省略
            mock.Setup(x => x.GetData()).Returns(FakeTable);

            mock.Object.Interact("default"); // 不打印

            int count = mock.Object.GetData().Rows.Count;
            Assert.True(count == mockTableRows);
        }

        [Fact(DisplayName = "定向重写")]
        public void Specify_ReturnsTrue()
        {
            mock.CallBase = true; // 先采用基类方法和函数
            mock.Setup(x => x.Interact(It.IsAny<string>())); // 再定向重写

            mock.Object.Interact("default"); // 不打印

            int count = mock.Object.GetData().Rows.Count;
            Assert.True(count == realTableRows);
        }

        private DataTable FakeTable()
        {
            var result = new DataTable();
            result.Columns.Add("id", typeof(int));

            result.Rows.Add(1);
            result.Rows.Add(2);

            return result;
        }
    }
}