code: def test_lying_multipart(self):
      source = textwrap.dedent(
          """\
              From: "Allison Dunlap" <xxx@example.com>
              To: yyy@example.com
              Subject: 64423
              Date: Sun, 11 Jul 2004 16:09:27 -0300
              MIME-Version: 1.0
              Content-Type: multipart/alternative;
  
              Blah blah blah
              """
      )
      with self._raise_point(errors.NoBoundaryInMultipartDefect):
          msg = self._str_msg(source)
      if self.raise_expected:
          return
      self.assertTrue(hasattr(msg, "defects"))
      self.assertEqual(len(self.get_defects(msg)), 2)
      self.assertIsInstance(
          self.get_defects(msg)[0], errors.NoBoundaryInMultipartDefect
      )
      self.assertIsInstance(
          self.get_defects(msg)[1],
          errors.MultipartInvariantViolationDefect,
      )
  
imports: import textwrap
  import unittest
  import contextlib
  from email import policy
  from email import errors
  from test.test_email import TestEmailBase
label_desc: Use image node_id 7 for calling the TestDefectsBase obj's underlying member method code with example usage: obj.test_lying_multipart() without return types