如何使用 Shouldly 正确断言多重排序？

Question

假设我有一个简单的数据类。

public class SortMeClass 
{
 public string StringProp { get; set; }
 public int IntProp { get; set; }
}

然后，我收集

SortMeClass

对象的集合，并按

StringProp

升序排序，然后按

IntProp

降序排序。

在我的集合上使用 Shouldly，我如何断言它首先按

StringProp

排序，然后按

IntProp

降序排列？

Answer 1

首先覆盖

Equals

和

HashCode

public override bool Equals(object obj)
    => Equals(obj as SortMeClass);

public bool Equals(SortMeClass other)
    => other != null &&
    StringProp == other.StringProp &&
    IntProp == other.IntProp;

public override int GetHashCode()
    => HashCode.Combine(StringProp, IntProp);

然后使用

ShouldBe

可以明确控制是否关心顺序

SortMeClass[] data = 
[
    new() { StringProp = "A", IntProp = 2 },
    new() { StringProp = "A", IntProp = 1 },
    new() { StringProp = "C", IntProp = 2 },
    new() { StringProp = "B", IntProp = 2 }
];

var actual = data.OrderBy(x => x.StringProp).ThenBy(x => x.IntProp);

SortMeClass[] expected = [
    new() { StringProp = "A", IntProp = 1 },
    new() { StringProp = "A", IntProp = 2 },
    new() { StringProp = "B", IntProp = 2 },
    new() { StringProp = "C", IntProp = 2 } //Change StringProp to D and see how the assertion fails
];

actual.ShouldBe(expected, ignoreOrder: false);