public void SetMutable()
{
var mapdoc = new HbmMapping();
var hbm = new HbmMap();
var mapper = new MapMapper(typeof(Animal), typeof(string), typeof(Animal), hbm, mapdoc);
mapper.Mutable(true);
hbm.Mutable.Should().Be.True();
mapper.Mutable(false);
hbm.Mutable.Should().Be.False();
}