command_line_substitutions:
  selected_package_number: 3

substitutions:
  a: from base config

  package1: &p1
    substitutions:
      a: from package1
      b: from package1
      c: from package1
    package1_test_list:
      - a: ${ a }
      - b: ${ b }
      - c: ${ c }

  package2: &p2 !include
            file: package2.yaml
            vars:
              a: from package2 vars

  package3: &p3
    substitutions:
      a: from package3
      b: from package3
      c: from package3
    package3_test_list:
      - a: ${ a }
      - b: ${ b }
      - c: ${ c }

  package4:
    substitutions:
      nested_package:
        substitutions:
          c: from nested package4
        nested_package_test_list:
          - a: ${ a }
          - b: ${ b }
          - c: ${ c }
    packages:
      - ${ nested_package }

  package_map:
    package1: *p1
    package2: *p2
    package3: *p3

  selected_package_number: 2  # will be overridden by command line substitutions
  selected_package_name: package${ selected_package_number }
  selected_package: ${ package_map[selected_package_name] }

packages:
  - ${ package1 }
  - ${ package2 }
  - ${ selected_package }
  - ${ package4 }

base_test_list:
  - a: ${ a }
  - b: ${ b }
  - c: ${ c }