code: def test_native_projection(self):
      source = ogc.WMTSRasterSource(self.URI, self.layer_name)
      source.validate_projection(self.projection)
  
imports: from unittest import mock
  from xml.etree.ElementTree import ParseError
  import numpy
  import pytest
  import cartopy.crs
  from cartopy.tests.conftest import _HAS_PYKDTREE_OR_SCIPY
  import cartopy.io.ogc_clients
  from cartopy.io.ogc_clients import _OWSLIB_AVAILABLE
label_desc: Use image node_id 3 for calling the TestWMTSRasterSource obj's underlying member method code with example usage: obj.test_native_projection() without return types