code: def test_contains(self):
      self.assertIs(1 in {}, False)
      self.assertIs(1 in {1: 1}, True)
  
imports: import unittest
  from test.support import os_helper
  import os
label_desc: Use image node_id 15 for calling the BoolTest obj's underlying member method code with example usage: obj.test_contains() without return types