[Fact]
 public void FluentAssertionsTest()
 {
     var art1 = new MyTestClass();
     art1.Should().BeEquivalentTo(new MyTestClass(), o => o
     //.Using<MyProperty?, MyPropertyComparer>()
     .Using<MyProperty, MyPropertyComparer>()
     );
 }

 public class MyTestClass
 {
     public MyProperty? ArticlePriceWithOtherParts { get; set; }
 }

 public struct MyProperty
 {
     public int Value1 { get; set; }
     public int Value2 { get; set; }
 }

 public class MyPropertyComparer : IEqualityComparer<MyProperty?>, IEqualityComparer<MyProperty>
 {
     public bool Equals(MyProperty? x, MyProperty? y)
     {
         var result = Equals(x?.Value1, y?.Value1);
         return result;
     }

     public bool Equals(MyProperty x, MyProperty y)
     {
         var result = Equals(x.Value1, y.Value1);
         return result;
     }

     public int GetHashCode([DisallowNull] MyProperty? obj)
     {
         if (obj is null)
             return 0;
         return obj.Value.Value1;
     }

     public int GetHashCode([DisallowNull] MyProperty obj)
     {
         return obj.Value1;
     }
 }