public void ConvertTypesUsing_Creates_Uses_MapperFactory_Instance() { var config = new MappingConfiguration(); var originalMapperFactory = config.MapperFactory; //the mapper factory remains the same Assert.AreSame(originalMapperFactory, config.MapperFactory); config.ConvertTypesUsing(new DefaultTypeConverter()); //New instance of the mapper factory Assert.AreNotSame(originalMapperFactory, config.MapperFactory); }