public void Immutable_When_CreatingFromBuilder_WithDefaultValue()
        {
            var entity = new MyImmutableEntity.Builder().ToImmutable();

            entity.Should().NotBeNull();
            entity.MyField1.Should().Be(4);
        }
        public void Immutable_When_CreatingFromBuilder_And_ImplicitlyCasted()
        {
            MyImmutableEntity entity = new MyImmutableEntity.Builder
            {
                MyField1 = 42
            };

            entity.Should().NotBeNull();
            entity.MyField1.Should().Be(42);
        }