test1.yaml

openapi: "3.0.0"
info:
  version: 1.0.0
  title: reference test part 1
  description: reference test part 1
components:
  schemas:
    test1a:
      $ref: "test2.yaml#/components/schemas/test2a"
    test1b:
      $ref: "#/components/schemas/test1c"
    test1c:
      type: int
    test1d:
      $ref: "test2.yaml#/components/schemas/test2b"