code: def test_minute_before_assets_trading(self):
      # since asset2 and asset3 both started trading on 1/5/2015, let's do
      # some history windows that are completely before that
      minutes = self.trading_calendar.minutes_for_session(
          self.trading_calendar.previous_session_label(
              pd.Timestamp("2015-01-05", tz="UTC")
          )
      )[0:60]
  
      for idx, minute in enumerate(minutes):
          bar_data = self.create_bardata(
              lambda: minute,
          )
          check_internal_consistency(
              bar_data, [self.ASSET2, self.ASSET3], ALL_FIELDS, 10, "1m"
          )
  
          for field in ALL_FIELDS:
              # OHLCP should be NaN
              # Volume should be 0
              asset2_series = bar_data.history(
                  self.ASSET2, field, 10, "1m"
              )
              asset3_series = bar_data.history(
                  self.ASSET3, field, 10, "1m"
              )
  
              if field == "volume":
                  np.testing.assert_array_equal(
                      np.zeros(10), asset2_series
                  )
                  np.testing.assert_array_equal(
                      np.zeros(10), asset3_series
                  )
              else:
                  np.testing.assert_array_equal(
                      np.full(10, np.nan), asset2_series
                  )
  
                  np.testing.assert_array_equal(
                      np.full(10, np.nan), asset3_series
                  )
  
imports: from textwrap import dedent
  from nose_parameterized import parameterized
  import numpy
  from numpy import nan
  import pandas
  from six import iteritems
  from catalyst import TradingAlgorithm
  from catalyst._protocol import handle_non_market_minutes, BarData
  from catalyst.assets import Asset, Equity
  from catalyst.errors import HistoryInInitialize, HistoryWindowStartsBeforeData
  from catalyst.finance.trading import SimulationParameters
  from catalyst.finance.asset_restrictions import NoRestrictions
  from catalyst.testing import create_minute_df_for_asset, str_to_seconds, MockDailyBarReader
  from catalyst.testing.fixtures import WithCreateBarData, WithDataPortal, CatalystTestCase, alias
label_desc: Use image node_id 5 for calling the MinuteEquityHistoryTestCase obj's underlying member method code with example usage: obj.test_minute_before_assets_trading() without return types