code: def test_prints_usage_with_help_flag(self):
      output = self.get_output("-h")
      self.assertIn(b"usage: ", output)
      self.assertIn(b"-d, -u: decode", output)
  
imports: import unittest
  import base64
  import binascii
  import os
  from array import array
  from test.support import os_helper
  from test.support import script_helper
label_desc: Use image node_id 6 for calling the TestMain obj's underlying member method code with example usage: obj.test_prints_usage_with_help_flag() without return types