Cleanup lingering test changes

Author: Michael0x2a

.flake8-tests

@@ -15,8 +15,6 @@ ignore =
   E701,
   E704,
   F811,
-  # Included to allow sys.version_info hack
-  E402,
   # irrelevant plugins
   B3,
   DW12

typing_extensions/README.md

@@ -59,33 +59,8 @@ issues when mixing the differing implementations of modified classes.
 
 ## Running tests
 
-### Python 2 tests
+To run tests, navigate into the appropriate source directory and run
+`test_typing_extensions.py`. You will also need to install the latest
+version of `typing` if you are using a version of Python that does not
+include `typing` as a part of the standard library.
 
-To test Python 2, you should:
-
-1. Install the latest version of typing
-2. Navigate into `src_py2` and run `test_typing_extensions.py`
-
-### Python 3 tests
-
-Similarly, to test Python 3, you can:
-
-1. Install the latest version of typing (for Python 3.4 or under)
-2. Navigate into `src_py3` and run `test_typing_extensions.py`
-
-However, you would need to repeat this test for each version of Python 3
-that has been released since Python 3.5.0 for full coverage.
-
-Since installing 7+ different versions of Python 3 is an onerous requirement,
-this module provides a second way of running tests that requires you to only
-have the latest version of Python 3 installed on your system:
-
-- Run `py -3 run_tests.py` (for Windows)
-- Run `python3 run_tests.py` (for Linux)
-
-The `run_tests.py` file will essentially "modify" the standard library by
-changing `PYTHONPATH` to point to individual folders in the `test_data` repo.
-
-Each individual folder contains a snapshot of the source code for the 
-`collections`, `typing,` and `abc` modules for that given release, letting us
-test `typing` against those particular implementations.

typing_extensions/run_tests.py

@@ -1,15 +1,4 @@
 import sys
-
-# Override version info
-#ORIGINAL_VERSION = sys.version_info
-#if len(sys.argv) >= 2 and sys.argv[-1].startswith("PYVERSION"):
-#    PYTHON_VERSION = tuple(map(int, sys.argv[-1].split('.')[1:]))
-#    sys.version_info = PYTHON_VERSION
-#    OVERRIDING_VERSION = True
-#else:
-#    PYTHON_VERSION = ORIGINAL_VERSION
-#    OVERRIDING_VERSION = False
-
 import os
 import abc
 import contextlib