Port the maximum message size check to a rule. Add doctest.

Rename the implicit.txt doctest.

specialized_message_from_string(): Mimic the way the text->message parser will
include the size of the original text as an attribute on the message object.
The maximum message size rule will use this information.

1 files changed, 13 insertions, 1 deletions

diff --git a/Mailman/tests/test_documentation.py b/Mailman/tests/test_documentation.py
index 390ba6a66..36b3c7ecb 100644
--- a/Mailman/tests/test_documentation.py
+++ b/Mailman/tests/test_documentation.py
@@ -36,7 +36,19 @@ COMMASPACE = ', '
 
 
 def specialized_message_from_string(text):
-    return message_from_string(text, Message)
+    """Parse text into a message object.
+
+    This is specialized in the sense that an instance of Mailman's own Message
+    object is returned, and this message object has an attribute
+    `original_size` which is the pre-calculated size in bytes of the message's
+    text representation.
+    """
+    # This mimic what Switchboard.dequeue() does when parsing a message from
+    # text into a Message instance.
+    original_size = len(text)
+    message = message_from_string(text, Message)
+    message.original_size = original_size
+    return message
 
 
 def setup(testobj):