code: def test_return_list_if_not_collection(self):
      self.assertListEqual(
          self.assertion._return_list_if_not_collection("U"), ["U"]
      )
      self.assertListEqual(
          self.assertion._return_list_if_not_collection(["U", "V"]),
          ["U", "V"],
      )
  
imports: import unittest
  from pgmpy.independencies import Independencies, IndependenceAssertion
label_desc: Use image node_id 2 for calling the TestIndependenceAssertion obj's underlying member method code with example usage: obj.test_return_list_if_not_collection() without return types