Make all the multibyte codec tests pass.

Changes to io.py, necessary to make this work:
- Redid io.StringIO as a TextIOWrapper on top of a BytesIO instance.
- Got rid of _MemoryIOMixin, folding it into BytesIO instead.
- The read() functions that take -1 to mean "eveything" now also take None.
- Added readline() support to BufferedIOBase. :-(

1 files changed, 5 insertions, 5 deletions

diff --git a/Lib/test/test_codecencodings_tw.py b/Lib/test/test_codecencodings_tw.py
index 054ace0036..bb7fd3822e 100644
--- a/Lib/test/test_codecencodings_tw.py
+++ b/Lib/test/test_codecencodings_tw.py
@@ -13,11 +13,11 @@ class Test_Big5(test_multibytecodec_support.TestBase, unittest.TestCase):
     tstring = test_multibytecodec_support.load_teststring('big5')
     codectests = (
         # invalid bytes
-        ("abc\x80\x80\xc1\xc4", "strict",  None),
-        ("abc\xc8", "strict",  None),
-        ("abc\x80\x80\xc1\xc4", "replace", "abc\ufffd\u8b10"),
-        ("abc\x80\x80\xc1\xc4\xc8", "replace", "abc\ufffd\u8b10\ufffd"),
-        ("abc\x80\x80\xc1\xc4", "ignore",  "abc\u8b10"),
+        (b"abc\x80\x80\xc1\xc4", "strict",  None),
+        (b"abc\xc8", "strict",  None),
+        (b"abc\x80\x80\xc1\xc4", "replace", "abc\ufffd\u8b10"),
+        (b"abc\x80\x80\xc1\xc4\xc8", "replace", "abc\ufffd\u8b10\ufffd"),
+        (b"abc\x80\x80\xc1\xc4", "ignore",  "abc\u8b10"),
     )
 
 def test_main():