Creates a MockUIComponent that does not expect to have
any of its lifecycle methods invoked; if you expect to
have any invoked, override the "expected calls" for
that lifecycle method.
This test performs action on the method
javax.faces.convert.Converter.getAsObject(FacesContext, UIComponent, String)
and
javax.faces.convert.Converter.getAsString(FacesContext, UIComponent, Object)
for method getAsObject() should return a value of null while getAsString()
should return a empty string.