samples/application_development/out_of_tree_board/sample.yaml

sample:
  description: Sample that uses an out-of-tree board
  name: Out-of-tree board
tests:
  boards.out_of_tree:
    tags: out_of_tree
    platform_whitelist: nrf52840_pca10056
    harness: console
    harness_config:
      type: one_line
      regex:
        - "Hello World! (.*)"