code: def test_crs_wkt(self):
      crs = self.c.crs_wkt
      assert re.match(WGS84PATTERN, crs)
  
imports: import unittest
  import re
  import pytest
  import fiona
  from .conftest import WGS84PATTERN
label_desc: Use image node_id 21 for calling the ReadingTest obj's underlying member method code with example usage: obj.test_crs_wkt() without return types