code: def test_self_join_tsb_none(self):
      tsA = np.array([1, 2, 3])
      tsB = None
  
      assert is_self_join(tsA, tsB) == True
  
imports: from matrixprofile.utils import *
  import numpy
  import pytest
label_desc: Use image node_id 17 for calling the TestClass obj's underlying member method code with example usage: obj.test_self_join_tsb_none() without return types