Authentication Testing page, that will generate a signed url ready for testing, and will send it to the server. If the credentials are accepted, the response will be shown in the bottom panel (Get URL directly) or in a new browser window. Note that (Get URL directly) requires access-control-origin response header set to allow requests from this page's domain in Firefox and Safari. This is due to the default security modes that prevent cross-site scripting. If you see 'success' returned in the status, but an empty page, this is possibly the reason.
Enter the host [and optional :port] to generate affiliate-specific URL or enter entire URL yourself. And use a trailing slash if its just a directory name.
For testing deep-linking pages. Put in a video ID from GoPublish.
For testing mobile player, put in "mobile" as platform.
For testing only use these to compare test signature with a known value