聊聊程式

以下程式碼都是看  [Unit Test Tricks] Compare Object Equality 
的實做練習小抄

[TestMethod]
public void 測試Order物件用MStest的Assert_Equals是會失敗的()
{
    var expected = new Order
    {
        Id = 1,
        Price = 10,
    };

    var actual = new Order
    {
        Id = 1,
        Price = 10,
    };

    //Assert.AreEqual 失敗。
    //預期: < ExpectedObjectsNote.Order >。實際: < ExpectedObjectsNote.Order >。
    Assert.AreEqual(expected, actual);
}

[TestMethod]
public void 將物件用屬性一個一個比較是會成功()
{
    var expected = new Order
    {
        Id = 1,
        Price = 10
    };

    var actual = new Order
    {
        Id = 1,
        Price = 10
    };

    Assert.AreEqual(expected.Id, actual.Id);
    Assert.AreEqual(expected.Price, actual.Price);
    //但是非常不方便 屬性多的話就不實用了
}

[TestMethod]
public void 匿名型別用AssertAreEqual是成功的()
{

    var expectedAnonymous = new
    {
        Id = 1,
        Name = "A",
        Age = 10
    };

    var actualAnonymous = new
    {
        Id = 1,
        Name = "A",
        Age = 10
    };
    //91說 兩個相同匿名型別的 instance 只有在其所有 property 都相等時，才代表相等。
    Assert.AreEqual(expectedAnonymous, actualAnonymous);
}

[TestMethod]
public void 用ExpectedObjects套件就可以比較兩個物件()
{
    var expected = new Person
    {
        Id = 1,
        Name = "A",
        Age = 10,
    };

    var actual = new Person
    {
        Id = 1,
        Name = "A",
        Age = 10,
    };

    expected.ToExpectedObject().ShouldEqual(actual);

    //假設actual的Age是11
    //得到的錯誤訊息
    //For Person.Age, expected[10] but found[11].



}

[TestMethod]
public void 用ExpectedObjects套件就可以比較兩個物件集合()
{
    var expected = new List<Person>
    {
        new Person { Id=1, Name="A",Age=10},
        new Person { Id=2, Name="B",Age=20},
        new Person { Id=3, Name="C",Age=30},
    };

    var actual = new List<Person>
    {
        new Person { Id=1, Name="A",Age=10},
        new Person { Id=2, Name="B",Age=20},
        new Person { Id=3, Name="Z",Age=30},
    };

    expected.ToExpectedObject().ShouldEqual(actual);
    //假設actual Id=3 Name是Z
    //得到的錯誤訊息
    //For List`1[2].Name, expected "C" but found "Z".
}

[TestMethod]
public void 用ExpectedObjects套件就可以比較兩個物件包物件()
{
    var expected = new Person
    {
        Id = 1,
        Name = "A",
        Age = 10,
        Order = new Order { Id = 91, Price = 910 },
    };

    var actual = new Person
    {
        Id = 1,
        Name = "A",
        Age = 10,
        Order = new Order { Id = 91, Price = 910 },
    };

    expected.ToExpectedObject().ShouldEqual(actual);
    //假設actual Price是919
    //得到的錯誤訊息
    //For Person.Order.Price, expected[910] but found[919].
}