Redirect to pool based on URI not working

So the answer to your issue is that you can set the pool multiple times in the iRule - it will follow the logic to the end of the iRule and only at that point will it send to the allocated pool. In your case you set the pool based on the URI, then you re-set it based on the IP and then the iRule ends.

Soooo.... you should work out your pseudocode so that it logically does what you want and build your iRule appropriately eg

if IP == internal then set pool X
elseif URI == /test then set pool Y
else do something else

The other thing that you can do is to use the

return

when HTTP_REQUEST {
  switch -glob [string tolower [HTTP::uri]] {
    "/test" {
      pool TESTPOOL_443
      return
      } 
  }
<...>