class_docstr: Test the GACLAC file handler.
docstr: Test getting the angle.
code: def test_get_angle(self):
      """Test getting the angle."""
      from satpy.tests.utils import make_dataid
  
      reader = mock.MagicMock()
      reader.get_angles.return_value = 1, 2, 3, 4, 5
      fh = _get_fh_mocked(reader=reader, angles=None)
  
      # Test angle readout
      key = make_dataid(name="sensor_zenith_angle")
      res = fh._get_angle(key)
      assert res == 2
      assert fh.angles == {
          "sensor_zenith_angle": 2,
          "sensor_azimuth_angle": 1,
          "solar_zenith_angle": 4,
          "solar_azimuth_angle": 3,
          "sun_sensor_azimuth_difference_angle": 5,
      }
  
      # Test buffering
      key = make_dataid(name="sensor_azimuth_angle")
      fh._get_angle(key)
      reader.get_angles.assert_called_once()
  
imports: from datetime import datetime
  from unittest import TestCase, mock
  import dask.array
  import numpy
  import pytest
  import xarray
label_desc: Use image node_id 9 for calling the TestGACLACFile obj's underlying member method code with example usage: obj.test_get_angle() without return types