docstr: Test PyUnicode_InternInPlace()
docstr_tok: ["Test","PyUnicode_InternInPlace","(",")"]
code: def test_interninplace(self):
      """Test PyUnicode_InternInPlace()"""
      from _testcapi import unicode_interninplace as interninplace
  
      s = b"abc".decode()
      r = interninplace(s)
      self.assertEqual(r, "abc")
  
imports: import unittest
  import sys
  from test import support
  from test.support import import_helper
label_desc: Use image node_id 15 for calling the CAPITest obj's underlying member method code with example usage: obj.test_interninplace() without return types