text: from nose.tools import assert_equal
  
  from pdfminer.layout import LTComponent
  from pdfminer.utils import Plane
  
  
  class TestPlane(object):
      def test_find_nothing_in_empty_bbox(self):
          plane, _ = self.given_plane_with_one_object()
          result = list(plane.find((50, 50, 100, 100)))
          assert_equal(result, [])
  
      def test_find_nothing_after_removing(self):
          plane, obj = self.given_plane_with_one_object()
          plane.remove(obj)
          result = list(plane.find((0, 0, 100, 100)))
          assert_equal(result, [])
  
      def test_find_object_in_whole_plane(self):
          plane, obj = self.given_plane_with_one_object()
          result = list(plane.find((0, 0, 100, 100)))
          assert_equal(result, [obj])
  
      def test_find_if_object_is_smaller_than_gridsize(self):
          plane, obj = self.given_plane_with_one_object(object_size=1, gridsize=100)
          result = list(plane.find((0, 0, 100, 100)))
          assert_equal(result, [obj])
  
      def test_find_object_if_much_larger_than_gridsize(self):
          plane, obj = self.given_plane_with_one_object(object_size=100, gridsize=10)
          result = list(plane.find((0, 0, 100, 100)))
          assert_equal(result, [obj])
  
      @staticmethod
      def given_plane_with_one_object(object_size=50, gridsize=50):
          bounding_box = (0, 0, 100, 100)
          plane = Plane(bounding_box, gridsize)
          obj = LTComponent((0, 0, object_size, object_size))
          plane.add(obj)
          return plane, obj
  