public void ToHashCode_should_calculate_same_hashcode_when_objects_are_same()
{
//Arrange
var person1 = new Person(1, "Hadi", "Ahmadi", new DateTime(1991, 1, 7));
var person2 = new Person(1, "Hadi", "Ahmadi", new DateTime(1991, 1, 7));
//Act
var firstPersonHashCode = new HashCodeBuilder()
.Append(person1.Id)
.Append(person1.Firstname)
.Append(person1.Lastname)
.Append(person1.BirthDate)
.ToHashCode();
var secondPersonHashCode = new HashCodeBuilder()
.Append(person2.Id)
.Append(person2.Firstname)
.Append(person2.Lastname)
.Append(person2.BirthDate)
.ToHashCode();
//Assert
firstPersonHashCode.Should().Be(secondPersonHashCode);
}