new_contents: from feedinlib import era5
  import cdsapi
  from unittest import mock
  
  
  def test_era5_download():
      cdsapi.Client = mock.Mock()
      instance_of_client = cdsapi.Client.return_value
      instance_of_client.download.return_value = None
      era5.get_era5_data_from_datespan_and_position(
          "2019-01-19", "2019-01-20", "test_file.nc", "50.0", "12.0"
      )
  
subject: Add mocked download test