new_contents: import pytest
  from aiohttp import hdrs
  
  from aiohttp_json_api.common import JSONAPI_CONTENT_TYPE
  
  
  @pytest.mark.parametrize(
      'resource_type',
      ('authors', 'books', 'chapters', 'photos', 'stores')
  )
  async def test_spec_schema(test_client, fantasy_app, jsonapi_validator,
                             resource_type):
      client = await test_client(fantasy_app)
      response = await client.get(f'/api/{resource_type}')
      json = await response.json(content_type=JSONAPI_CONTENT_TYPE)
      assert jsonapi_validator.is_valid(json)
  
  
  async def test_content_negotiation(test_client, fantasy_app):
      client = await test_client(fantasy_app)
      response = await client.get(
          '/api/books/1',
          headers={hdrs.ACCEPT: 'application/vnd.api+json'}
      )
      assert response.status == 200
      assert response.headers['Content-Type'] == 'application/vnd.api+json'
  
      response = await client.get(
          '/api/books/1',
          headers={hdrs.CONTENT_TYPE: 'application/vnd.api+json; foo=bar'}
      )
      assert response.status == 415
  
      response = await client.get(
          '/api/books/1',
          headers={hdrs.ACCEPT: 'application/vnd.api+json; foo=bar'}
      )
      assert response.status == 406
  
subject: Add tests for JSON API schema and content type negotiation