code: def test_resolution_string(self):
      assert Timedelta(days=1).resolution_string == "D"
      assert Timedelta(days=1, hours=6).resolution_string == "h"
      assert Timedelta(days=1, minutes=6).resolution_string == "min"
      assert Timedelta(days=1, seconds=6).resolution_string == "s"
      assert Timedelta(days=1, milliseconds=6).resolution_string == "ms"
      assert Timedelta(days=1, microseconds=6).resolution_string == "us"
      assert Timedelta(days=1, nanoseconds=6).resolution_string == "ns"
  
imports: from datetime import timedelta
  import sys
  from hypothesis import given, strategies
  import numpy
  import pytest
  from pandas._libs import lib
  from pandas._libs.tslibs import NaT, iNaT
  from pandas._libs.tslibs.dtypes import NpyDatetimeUnit
  from pandas.errors import OutOfBoundsTimedelta
  from pandas import Timedelta, to_timedelta
  import pandas._testing
label_desc: Use image node_id 18 for calling the TestTimedeltas obj's underlying member method code with example usage: obj.test_resolution_string() without return types