code: def test_constants(self):
      """Test the constant values."""
      # Test the value of the constants
      assert satpy.readers.vii_utils.C1 == C1
      assert satpy.readers.vii_utils.C2 == C2
      assert (
          satpy.readers.vii_utils.TIE_POINTS_FACTOR == TIE_POINTS_FACTOR
      )
      assert (
          satpy.readers.vii_utils.SCAN_ALT_TIE_POINTS
          == SCAN_ALT_TIE_POINTS
      )
      assert (
          satpy.readers.vii_utils.MEAN_EARTH_RADIUS == MEAN_EARTH_RADIUS
      )
  
imports: import unittest
  import satpy.readers.vii_utils
label_desc: Use image node_id 1 for calling the TestViiUtils obj's underlying member method code with example usage: obj.test_constants() without return types