code: def test_filter_mask(self):
      mask = Geometry.from_dict(
          **{
              "type": "Polygon",
              "coordinates": (
                  (
                      (-112, 38),
                      (-112, 40),
                      (-106, 40),
                      (-106, 38),
                      (-112, 38),
                  ),
              ),
          }
      )
      results = list(self.c.filter(mask=mask))
      assert len(results) == 26
  
imports: import pytest
  import fiona
  from fiona.model import Geometry
label_desc: Use image node_id 4 for calling the TestFilterReading obj's underlying member method code with example usage: obj.test_filter_mask() without return types