code: def test_is_on_offset(self, weekday):
      offset = Week(weekday=weekday)
  
      for day in range(1, 8):
          date = datetime(2008, 1, day)
          expected = day % 7 == weekday
      assert_is_on_offset(offset, date, expected)
  
imports: from __future__ import annotations
  from datetime import datetime, timedelta
  import pytest
  from pandas._libs.tslibs import Timestamp
  from pandas._libs.tslibs.offsets import Day, LastWeekOfMonth, Week, WeekOfMonth
  import pandas._testing
  from pandas.tests.tseries.offsets.common import WeekDay, assert_is_on_offset, assert_offset_equal
label_desc: Use image node_id 5 for calling the TestWeek obj's underlying member method code with example usage: obj.test_is_on_offset(weekday) without return types