#15232: correctly mangle From lines in MIME preamble and epilogue
diff --git a/Lib/email/test/test_email.py b/Lib/email/test/test_email.py
index 65b3ebd..95dc4af 100644
--- a/Lib/email/test/test_email.py
+++ b/Lib/email/test/test_email.py
@@ -1275,6 +1275,28 @@
Blah blah blah
""")
+ def test_mangle_from_in_preamble_and_epilog(self):
+ s = StringIO()
+ g = Generator(s, mangle_from_=True)
+ msg = email.message_from_string(textwrap.dedent("""\
+ From: foo@bar.com
+ Mime-Version: 1.0
+ Content-Type: multipart/mixed; boundary=XXX
+
+ From somewhere unknown
+
+ --XXX
+ Content-Type: text/plain
+
+ foo
+
+ --XXX--
+
+ From somewhere unknowable
+ """))
+ g.flatten(msg)
+ self.assertEqual(len([1 for x in s.getvalue().split('\n')
+ if x.startswith('>From ')]), 2)
# Test the basic MIMEAudio class