public void SetDiscriminatorValue() { var subClass = typeof(Inherited); var mapdoc = new HbmMapping(); var mapper = new SubclassMapper(subClass, mapdoc); mapper.DiscriminatorValue("blah"); var hbmEntity = mapdoc.SubClasses[0]; hbmEntity.DiscriminatorValue.Should().Be("blah"); mapper.DiscriminatorValue(null); hbmEntity.DiscriminatorValue.Should().Be("null"); }