(Merge 3.1) Issue #12057: Convert CJK encoding testcase BLOB into multiple text

files

diff --cc Lib/test/test_multibytecodec_support.py
index ed15ce1d3d1f3788135202a19368991739982039,75e95ca9967cf5f79926f121d1433fbc8778685e..a48fbe4813dffb3d6c294b360eb401bf400d8a5e
--- 1/Lib/test/test_multibytecodec_support.py
--- 2/Lib/test/test_multibytecodec_support.py
+++ b/Lib/test/test_multibytecodec_support.py
@@@ -4,9 -4,11 +4,12 @@@
  #   Common Unittest Routines for CJK codecs
  #
  
- import sys, codecs
- import unittest, re
+ import codecs
+ import os
+ import re
+ import sys
+ import unittest
 +from http.client import HTTPException
  from test import support
  from io import BytesIO