code: def test_encode_truefalse(self):
      self.assertEqual(
          self.dumps({True: False, False: True}, sort_keys=True),
          '{"false": true, "true": false}',
      )
      self.assertEqual(
          self.dumps(
              {2: 3.0, 4.0: 5, False: 1, 6: True}, sort_keys=True
          ),
          '{"false": 1, "2": 3.0, "4.0": 5, "6": true}',
      )
  
file_path: cpython/Lib/test/test_json/test_dump.py
imports: from io import StringIO
  from test.test_json import PyTest, CTest
  from test.support import bigmemtest, _1G
label_desc: Use image node_id 4 for calling the TestDump obj's underlying member method code with example usage: obj.test_encode_truefalse() without return types