docker-compose/pkg/compose/testdata/publish/compose.yaml

name: test
services:
  test:
    extends:
      file: common.yaml
      service: foo

  string:
    image: test
    env_file: test.env

  list:
    image: test
    env_file:
      - test.env

  mapping:
    image: test
    env_file:
      - path: test.env