Web Services Request can be simply tested by calling their URL.
In case of module, the url (like site/person_module) must returns a list of brain objects. This represents the listing of a module.
As WSR are traversable, it is possible to call directly for an object given its id (like site/person_module/8), this returns just one brain object. Calling asXML object on it (site/person_module/8/asXMl) will returns the representation of the object in TioSafe XML.