Merged revisions 77517,77525 via svnmerge from

svn+ssh://pythondev@svn.python.org/python/trunk

Merge adds an additional test for as_string with a maxheaderlen specified.

........
  r77517 | r.david.murray | 2010-01-16 00:15:17 -0500 (Sat, 16 Jan 2010) | 6 lines

  Issue #1670765: Prevent email.generator.Generator from re-wrapping
  headers in multipart/signed MIME parts, which fixes one of the sources of
  invalid modifications to such parts by Generator.  Patch and tests by
  Martin von Gagern.
........
  r77525 | r.david.murray | 2010-01-16 11:08:32 -0500 (Sat, 16 Jan 2010) | 2 lines

  Fix issue number in comment.
........

1 files changed, 38 insertions, 0 deletions

diff --git a/Lib/email/test/test_email.py b/Lib/email/test/test_email.py
index 4ffc8f9b2c..77364122a4 100644
--- a/Lib/email/test/test_email.py
+++ b/Lib/email/test/test_email.py
@@ -3387,6 +3387,44 @@ Content-Type: application/x-foo;
 
 
 
+# Tests to ensure that signed parts of an email are completely preserved, as
+# required by RFC1847 section 2.1.  Note that these are incomplete, because the
+# email package does not currently always preserve the body.  See issue 1670765.
+class TestSigned(TestEmailBase):
+
+    def _msg_and_obj(self, filename):
+        with openfile(findfile(filename)) as fp:
+            original = fp.read()
+            msg = email.message_from_string(original)
+        return original, msg
+
+    def _signed_parts_eq(self, original, result):
+        # Extract the first mime part of each message
+        import re
+        repart = re.compile(r'^--([^\n]+)\n(.*?)\n--\1$', re.S | re.M)
+        inpart = repart.search(original).group(2)
+        outpart = repart.search(result).group(2)
+        self.assertEqual(outpart, inpart)
+
+    def test_long_headers_as_string(self):
+        original, msg = self._msg_and_obj('msg_45.txt')
+        result = msg.as_string()
+        self._signed_parts_eq(original, result)
+
+    def test_long_headers_as_string_maxheaderlen(self):
+        original, msg = self._msg_and_obj('msg_45.txt')
+        result = msg.as_string(maxheaderlen=60)
+        self._signed_parts_eq(original, result)
+
+    def test_long_headers_flatten(self):
+        original, msg = self._msg_and_obj('msg_45.txt')
+        fp = StringIO()
+        Generator(fp).flatten(msg)
+        result = fp.getvalue()
+        self._signed_parts_eq(original, result)
+
+
+
 def _testclasses():
     mod = sys.modules[__name__]
     return [getattr(mod, name) for name in dir(mod) if name.startswith('Test')]