class_docstr: Tests for the AHI HSD file handler.
class_docstr_tok: ["Tests","for","the","AHI","HSD","file","handler","."]
docstr: Test that valid times are correctly identified.
docstr_tok: ["Test","that","valid","times","are","correctly","identified","."]
code: def test_is_valid_time(self):
      """Test that valid times are correctly identified."""
      assert AHIHSDFileHandler._is_valid_timeline(
          FAKE_BASIC_INFO["observation_timeline"]
      )
      assert not AHIHSDFileHandler._is_valid_timeline("65526")
  
imports: from __future__ import annotations
  import contextlib
  import unittest
  import warnings
  from datetime import datetime
  from typing import Any, Dict
  from unittest import mock
  import dask.array
  import numpy
  import pytest
  from satpy.readers.ahi_hsd import AHIHSDFileHandler
  from satpy.readers.utils import get_geostationary_mask
  from satpy.tests.utils import make_dataid
label_desc: Use image node_id 10 for calling the TestAHIHSDFileHandler obj's underlying member method code with example usage: obj.test_is_valid_time() without return types