code: def test_magnitude(self):
      block_val = predicates.magnitudeOfCardinality(self.s1)
      assert block_val == {"0"}
  
      block_val = predicates.magnitudeOfCardinality(())
      assert block_val == set()
  
imports: import unittest
  from dedupe import predicates
label_desc: Use image node_id 5 for calling the TestSetElement obj's underlying member method code with example usage: obj.test_magnitude() without return types