new_contents: import pytest
  
  from web3.web3.ipcprovider import IPCProvider
  from web3.web3.rpcprovider import TestRPCProvider, RPCProvider
  
  
  @pytest.fixture(params=['tester', 'rpc', 'ipc'])
  def disconnected_provider(request):
      """
      Supply a Provider that's not connected to a node.
  
      (See also the web3 fixture.)
      """
      if request.param == 'tester':
          provider = TestRPCProvider()
          provider.server.shutdown()
          provider.server.server_close()
          return provider
      elif request.param == 'rpc':
          return RPCProvider(port=9999)
      elif request.param == 'ipc':
          return IPCProvider(ipc_path='nonexistent')
      else:
          raise ValueError(request.param)
  
subject: Add fixture for disconnected providers