old_contents: import time
  import unittest
  
  from conans.server.revision_list import RevisionList
  from conans.util.dates import from_timestamp_to_iso8601
  
  
  class RevisionListTest(unittest.TestCase):
  
      def test_remove_latest(self):
          rev = RevisionList()
          rev.add_revision("rev1")
          rev.add_revision("rev2")
  
          dumped = rev.dumps()
          loaded = RevisionList.loads(dumped)
          self.assertEqual(rev, loaded)
          self.assertEqual(loaded.latest_revision().revision, "rev2")
  
          loaded.remove_revision("rev2")
          self.assertEqual(loaded.latest_revision().revision, "rev1")
  
      def test_remove_non_latest(self):
          rev = RevisionList()
          rev.add_revision("rev1")
          rev.add_revision("rev2")
  
          dumped = rev.dumps()
          loaded = RevisionList.loads(dumped)
          loaded.remove_revision("rev1")
          self.assertEqual(loaded.latest_revision().revision, "rev2")
  
      def test_compatibility_with_timestamps(self):
          the_time = time.time()
          iso = from_timestamp_to_iso8601(the_time)
          old_contents = '{"revisions": [{"revision": "rev1", "time": %s}, ' \
                         '{"revision": "rev2", "time": "%s"}]}' % (the_time, the_time)
          r_list = RevisionList.loads(old_contents)
          when = r_list.get_time("rev1")
          self.assertEqual(when, iso)
  
new_contents: from math import floor
  
  import time
  import unittest
  
  from conans.server.revision_list import RevisionList
  from conans.util.dates import from_timestamp_to_iso8601
  
  
  class RevisionListTest(unittest.TestCase):
  
      def test_remove_latest(self):
          rev = RevisionList()
          rev.add_revision("rev1")
          rev.add_revision("rev2")
  
          dumped = rev.dumps()
          loaded = RevisionList.loads(dumped)
          self.assertEqual(rev, loaded)
          self.assertEqual(loaded.latest_revision().revision, "rev2")
  
          loaded.remove_revision("rev2")
          self.assertEqual(loaded.latest_revision().revision, "rev1")
  
      def test_remove_non_latest(self):
          rev = RevisionList()
          rev.add_revision("rev1")
          rev.add_revision("rev2")
  
          dumped = rev.dumps()
          loaded = RevisionList.loads(dumped)
          loaded.remove_revision("rev1")
          self.assertEqual(loaded.latest_revision().revision, "rev2")
  
      def test_compatibility_with_timestamps(self):
          the_time = floor(time.time())
          iso = from_timestamp_to_iso8601(the_time)
          old_contents = '{"revisions": [{"revision": "rev1", "time": %s}, ' \
                         '{"revision": "rev2", "time": "%s"}]}' % (the_time, the_time)
          r_list = RevisionList.loads(old_contents)
          when = r_list.get_time("rev1")
          self.assertEqual(when, iso)
  
subject: Fix test