error handler for stdin and stdout.

error handler for stdin and stdout.

Remove redundant tests now that str is unicode.

This eliminates a few redundant test cases.

* No longer attempts to close already freed socket file descriptor
* Use socket object to be compatible with Windows
* Do not use a timeout to avoid complication with non-blocking mode
* Use internal localhost server rather than depending on a third party
* Avoid trouble with buffered HTTP data by testing tunnelled CONNECT data

Issue #26716. IOError is a deprecated alias to OSError since Python 3.3.

Patch by Giampaolo Rodola'.

Patch by Giampaolo Rodola'.

Patch by Geoff Wilson.

Patch by Geoff Wilson.

directories.

Thanks to Wolfgang Langner for the bug report and initial version of
the patch.

typing.ContextManager.

Exceptions raised during converting argument of correct type are no longer
overridded with TypeError. Some error messages are now more detailed.

ByteArrayAsStringTest.fixtype() was converting test data to bytes, not byte-
array, therefore many of the test cases inherited in this class were not
actually being run on the bytearray type.

The tests in buffer_tests.py were redundant with methods in string_tests
.MixinStrUnicodeUserStringTest and string_tests.CommonTest. These methods are
now moved into string_tests.BaseTest, where they will also get run for bytes
and bytearray.

This change also moves test_additional_split(), test_additional_rsplit(), and
test_strip() from CommonTest to BaseTest, meaning these tests are now run for
bytes and bytearray. I plan to eliminate redundancies with existing tests in
test_bytes.py soon.