public void Immutable_When_CreatingABuilderFromExisting()
{
MyImmutableEntity original = new MyImmutableEntity.Builder
{
MyField1 = 42
};
MyImmutableEntity newInstance = original
.WithMyField1(43);
original.MyField1.Should().Be(42);
newInstance.MyField1.Should().Be(43);
}
public void Immutable_When_Using_Options()
{
var list = ImmutableList <string> .Empty;
var original = MyImmutableEntity.None;
var modifiedBuilder = original.WithList(list);
Option <MyImmutableEntity> modifiedOption = modifiedBuilder;
MyImmutableEntity modified = modifiedOption;
original.MatchNone().Should().BeTrue();
modifiedOption.MatchSome().Should().BeTrue();
modified.MyField1.Should().Be(MyImmutableEntity.Default.MyField1);
modified.MyField2.Should().Be(MyImmutableEntity.Default.MyField2);
modified.Date.Should().Be(MyImmutableEntity.Default.Date);
modified.List.Should().BeSameAs(list);
}