code: def test_invalid_multilinestring(self):
      with self.assertRaises(ValueError) as cm:
          geojson.MultiLineString([1], validate=True)
  
      self.assertIn(
          "each line must be a list of positions", str(cm.exception)
      )
  
      mls = geojson.MultiLineString([[(10, 5), (20, 1)], []])
      self.assertEqual(mls.is_valid, False)
  
imports: import unittest
  import geojson
label_desc: Use image node_id 1 for calling the TestValidationMultiLineString obj's underlying member method code with example usage: obj.test_invalid_multilinestring() without return types