openapi: 3.0.3
info:
  title: asd
  version: 0.0.1
paths:
  /test:
    post:
      requestBody:
        content:
          multipart/form-data:
            schema:
              $ref: '#/components/schemas/TestBody'
      responses:
        200:
          description: ok
components:
  schemas:
    TestBody:
      required:
        - test_enum
      type: object
      properties:
        test_enum:
          allOf:
            - $ref: "#/components/schemas/TestEnum"
    TestEnum:
      enum:
        - A
        - B