You see the problem there is that development and test are gateway environments. They lead frequently to other environments such as staging, and production, at which point you find yourself dependent on Oracle's latest stuff and it can be time consuming and expensive to get yourself clean.
Next time you find yourself Jonesing for the latest features and someone offers you dev & test for free, just say no.
Actually not the case (and I'm not sure it ever was). We were under this misapprehension for while too.
You're allowed to have a development database to "create one prototype" with a very loose description of what that is. It also "limits the use ... to one person .. and one server". As for testing - "all programs used in a test environment must be licensed".
Next time you find yourself Jonesing for the latest features and someone offers you dev & test for free, just say no.