code: def test_missing_padding(self):
      # 1 missing padding character
      self._test(b"dmk", b"vi", [errors.InvalidBase64PaddingDefect])
      # 2 missing padding characters
      self._test(b"dg", b"v", [errors.InvalidBase64PaddingDefect])
  
imports: import unittest
  from email import _encoded_words
  from email import errors
  from test.test_email import TestEmailBase
label_desc: Use image node_id 3 for calling the TestDecodeB obj's underlying member method code with example usage: obj.test_missing_padding() without return types