An important thing about Diana is that it is one API divided in four, one for each database flavor. So, just the API is useless without an implementation. Once the database implements Diana and passes on TCK, it calls him a database driver from a type.
In a multi-model database, that has support for more than one NoSQL kind; the provider must implement more than one API, one to each database that it supports.
There are database drivers ready to test:
https://github.com/eclipse/jnosql-diana-driver
Some samples: