Why am I unable to create a site or interface with the word "test"?

Environment: 

Sites and Interfaces

Resolution:

You are unable to use the word "test" at the end of a site name or interface name, as Oracle B2C Service reserves naming sites with the word "test" for internal testing.  However, the VHOST name can include the word "test". 

For historical reasons we don't run utilities against sites where the site or interface name ends in "test" or "test###" where # is a digit.

Our Cloud Operations Team has hard-coded this in the product functionality, and only applies to the interface name and site name.