code: import pandas as pd
  import pytest
  
  from async_blp.instruments_requests import InstrumentRequestBase
  
  
  @pytest.mark.asyncio
  class TestInstrumentRequestBase:
  
      def test__weight(self):
          request = InstrumentRequestBase('query', max_results=5)
          request.response_fields = ['field_1', 'field_2']
  
          assert request.weight == 10
  
      async def test__process(self, security_lookup_msg):
          request = InstrumentRequestBase('query', max_results=5)
          request.response_fields = ['security', 'description']
  
          request.send_queue_message(security_lookup_msg)
          request.send_queue_message(None)
  
          data, _ = await request.process()
  
          expected_data = pd.DataFrame([['F US Equity', 'Ford Motors Co']],
                                       columns=['security', 'description'])
  
          pd.testing.assert_frame_equal(expected_data, data)
  
apis: pandas.DataFrame pandas.testing.assert_frame_equal