tests: Add a sample for testing natively

This simple unit test runs basic sanity checking on buffers from
net_buf_get. It demonstrates the mocking support in a real-world case,
where it is used to remove the dependency to nano_fifo.

Origin: Original

Signed-off-by: Jaakko Hannikainen <jaakko.hannikainen@intel.com>
Change-Id: If2757823bebbc0fa22b3064a432032cdbccdfe2b
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
3 files changed