code: def test_compact_known(self):
      # Sanity-check some implementation details (we don't guarantee
      # that these are/aren't compact)
      self.assertEqual(_testcapi.call_long_compact_api(-1), (True, -1))
      self.assertEqual(_testcapi.call_long_compact_api(0), (True, 0))
      self.assertEqual(
          _testcapi.call_long_compact_api(256), (True, 256)
      )
      self.assertEqual(
          _testcapi.call_long_compact_api(sys.maxsize), (False, -1)
      )
  
imports: import unittest
  import sys
  from test.support import import_helper
label_desc: Use image node_id 2 for calling the LongTests obj's underlying member method code with example usage: obj.test_compact_known() without return types