class_docstr: Test the VGACFileHandler reader.
docstr: Test reading reflectances and BT.
docstr_tok: ["Test","reading","reflectances","and","BT","."]
code: def test_read_vgac(self, nc_filename):
      """Test reading reflectances and BT."""
      from satpy.scene import Scene
  
      # Read data
      scn_ = Scene(reader="viirs_vgac_l1c_nc", filenames=[nc_filename])
      scn_.load(["M05", "M15"])
      assert scn_["M05"][0, 0] == 100
      assert scn_["M15"][0, 0] == 400
      assert scn_.start_time == datetime.datetime(
          year=2023, month=3, day=28, hour=9, minute=8, second=7
      )
      assert scn_.end_time == datetime.datetime(
          year=2023, month=3, day=28, hour=10, minute=11, second=12
      )
  
imports: import datetime
  import numpy
  import pytest
  from netCDF4 import Dataset
label_desc: Use image node_id 1 for calling the TestVGACREader obj's underlying member method code with example usage: obj.test_read_vgac(nc_filename) without return types