code: def in_memory_reader_for_close(self, close):
      nan_frame = pd.DataFrame(
          np.nan,
          index=close.index,
          columns=close.columns,
      )
      frames = {"close": close}
      for key in "open", "high", "low", "volume":
          frames[key] = nan_frame
      return InMemoryDailyBarReader(
          frames,
          self.trading_calendar,
          currency_codes=pd.Series(index=close.columns, data="USD"),
      )
  
imports: import logbook
  import numpy
  import pandas
  from zipline.data.adjustments import SQLiteAdjustmentReader, SQLiteAdjustmentWriter
  from zipline.data.in_memory_daily_bars import InMemoryDailyBarReader
  from zipline.testing import parameter_space
  from zipline.testing.predicates import assert_equal
  from zipline.testing.fixtures import WithInstanceTmpDir, WithTradingCalendars, WithLogger, ZiplineTestCase
label_desc: Use image node_id 6 for calling the TestSQLiteAdjustmentsWriter obj's underlying member method code with example usage: obj.in_memory_reader_for_close(close) and returns: InMemoryDailyBarReader