code: def test_float_timestamp_format():
      now = datetime.now()
      timestamp = now.timestamp()
      result = format_datetime(timestamp)
      # %Y/%m/%d %H:%M:%S.%f %Z%z
      pattern = rf"{now.year}/{now.month}/{now.day} {now.hour}:{now.minute}:{now.second}.{now.microsecond}"
      assert_that(
          result,
          instance_of(str),
          matches_regexp(pattern),  # type: ignore
      )
  
file_path: deepchecks/tests/utils/test_string_utils.py
imports: from datetime import datetime
  from hamcrest import assert_that, calling, equal_to, instance_of, matches_regexp, raises
  from deepchecks.utils.strings import format_datetime, truncate_string
label_desc: Use image node_id 4 for calling a global function with example usage: test_float_timestamp_format() without return types