  import datetime
  import unittest
  
  from django.utils.dateparse import parse_duration
  from django.utils.duration import duration_iso_string, duration_string
  
  
  class TestDurationString(unittest.TestCase):
  
      def test_simple(self):
 
</s> remove from django.utils.duration import duration_string
 </s> add from django.utils.duration import duration_microseconds, duration_string </s> remove         duration = datetime.timedelta(days=123, seconds=123, microseconds=123)
 </s> add         duration = datetime.timedelta(microseconds=8999999999999999)
from django.utils.duration import (
    duration_iso_string, duration_microseconds, duration_string,
)
  import datetime
  import unittest
  
  from django.utils.dateparse import parse_duration
from django.utils.duration import (
    duration_iso_string, duration_microseconds, duration_string,
)
  
  
  class TestDurationString(unittest.TestCase):
  
      def test_simple(self):
keep keep keep keep replace keep keep keep keep keep
 Fixed #28926 -- Fixed loss of precision of big DurationField values on SQLite and MySQL. 
tests/utils_tests/test_duration.py