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GeezerVison is showing github.com — test_email: `content-shadow` header tuple is discarded in `test_message.py` · Issue #161479 · python/cpython

test_email: content-shadow header tuple is discarded in test_message.py #161479

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#161480
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test_email: content-shadow header tuple is discarded in test_message.py#161479
#161480
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testsTests in the Lib/test dirTests in the Lib/test dirtopic-emailtype-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

Description

@PavlNekrasov
PavlNekrasov
opened on Nov 6, 2026
Issue body actions

Bug report

cpython/Lib/test/test_email/test_message.py

Lines 584 to 585 in 288cc2b

if subtype != 'no_content':
('content-shadow', 'Logrus'),

The tuple is created and immediately discarded, so content-shadow never ends
up in msg_headers and the check that non-standard content-* headers (other
than Content-Type) are copied to the part in _check_make_multipart never
runs:

cpython/Lib/test/test_email/test_message.py

Lines 616 to 619 in 288cc2b

for name, value in msg_headers:
if name.lower().startswith('content-'):
self.assertEqual(part[name], value)
count += 1

The mistake masks a real regression: if the condition in Lib/email/message.py
is narrowed to Content-Type only, the current test set stays green (307 OK),
while with the content-shadow header properly appended 36 tests fail.

Found by Linux Verification Center (linuxtesting.org) with SVACE

CPython versions tested on:

CPython main branch

Operating systems tested on:

No response

Linked PRs

  • gh-161479: Fix discarded header tuple in test_email test_message #161480

Activity

  1. PavlNekrasov
    added
    type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error
    on Nov 6, 2026
  2. NekoAsakura
    added
    testsTests in the Lib/test dirTests in the Lib/test dir
    topic-email
    on Nov 6, 2026
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