FluentAssertions 的使用

 

做單元測試時，時常需要判斷兩物件裡面的每一個欄位是否一致，
這並不好處理，一做法是實作物件的 Equals 方法來判斷是否一致，範例如下

var a = new People() { Id = 1, Name = "Bill", Description = "none" };
var b = new People() { Id = 1, Name = "Bill", Description = "none" };

if (a.Equals(b))
{
    Console.WriteLine("ok");
}

public class People : IEquatable<People>
{
    public int Id { get; set; }
    public string Name { get; set; }
    public string Description { get; set; }

    public bool Equals(People other)
    {
        if (ReferenceEquals(null, other)) return false;
        if (ReferenceEquals(this, other)) return true;
        return this.Id == other.Id && this.Name == other.Name && this.Description == other.Description;
    }
}

public interface IEquatable<People>
{
    public bool Equals(People other);
};

第二則是利用 FluentAssertions 套件來處理，
如下範例，開一個 xUnit Test Project，
並於 Nuget 安裝好 FluentAssertions 套件，
並填入下面程式碼

using FluentAssertions;

namespace TestProject1
{
    public class UnitTest1
    {
        [Fact]
        public void Test1()
        {
            // Arrange
            var a = new People() { Id = 1, Name = "Bill", Description = "be modify" };
            var b = new People() { Id = 1, Name = "Bill", Description = "none" };

            // Act
            b = ModifyDescription(b);

            // Assert
            a.Should().BeEquivalentTo(b, options => options.ExcludingMissingMembers());
        }

        private People ModifyDescription(People people)
        {
            people.Description = "be modify";
            return people;
        }
    }
}

public class People
{
    public int Id { get; set; }
    public string Name { get; set; }
    public string Description { get; set; }
}

參考資料：
利用FluentAssertions做部分比對或排除特定欄位比對
Test 中驗證 Object 是否相同的方法
Fluent Assertions