Eu recebo este erro:A potentially dangerous Request.Path value was detected from the client (?). quando este URI:http://www.site.com/%3f.

Como escrever testes de integração em torno de todos esses tipos de erros?
Eu quero testar contra todos esses erros:

A potentially dangerous Request.Path value was detected from the client
A potentially dangerous Request.Cookies value was detected from the client
A potentially dangerous Request.Form value was detected from the client
A potentially dangerous Request.QueryString value was detected from the client