code: def test_countTestCases_zero_nested(self):
      class Test1(unittest.TestCase):
          def test(self):
              pass
  
      suite = unittest.TestSuite([unittest.TestSuite()])
  
      self.assertEqual(suite.countTestCases(), 0)
  
imports: import unittest
  import gc
  import sys
  import weakref
  from test.test_unittest.support import LoggingResult, TestEquality
label_desc: Use image node_id 7 for calling the Test_TestSuite obj's underlying member method code with example usage: obj.test_countTestCases_zero_nested() without return types