code: def test_background_two_regions(self):
      x = np.array([[0, 0, 6], [0, 0, 6], [5, 5, 5]])
  
      res = label(x, background=0)
      assert_array_equal(res, [[0, 0, 1], [0, 0, 1], [2, 2, 2]])
  
imports: import numpy
  from skimage.measure import label
  import skimage.measure._ccomp
  from skimage._shared import testing
  from skimage._shared.testing import assert_array_equal
label_desc: Use image node_id 7 for calling the TestConnectedComponents obj's underlying member method code with example usage: obj.test_background_two_regions() without return types