a.yaml

openapi: "3.0.0"
info:
  version: 1.0.0
  title: Swagger Petstore
  license:
    name: MIT
servers:
  - url: http://petstore.swagger.io/v1
paths:
  /test:
    post:
      parameters:
        - name: test1
          in: query
          required: false
      responses:
        "200":
          description: "Test"
components: {}