code: def test_padding(self):
      self.assertEqual(_ew.encode_b(b"vi"), "dmk=")
  
imports: import unittest
  from email import _encoded_words
  from email import errors
  from test.test_email import TestEmailBase
label_desc: Use image node_id 2 for calling the TestEncodeB obj's underlying member method code with example usage: obj.test_padding() without return types