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Trying to rerun the tests that failed but it just says that the module doesn't exist. I am running the exact command line mentioned in the readme file:
$ make test TESTOPTS="-v test_that_failed"
running build
running build_ext
The following modules found by detect_modules() in setup.py, have been
built by the Makefile instead, as configured by the Setup files:
atexit pwd time 
running build_scripts
copying and adjusting /home/pmatos/Projects/cpython/Tools/scripts/pydoc3 -> build/scripts-3.7
copying and adjusting /home/pmatos/Projects/cpython/Tools/scripts/idle3 -> build/scripts-3.7
copying and adjusting /home/pmatos/Projects/cpython/Tools/scripts/2to3 -> build/scripts-3.7
copying and adjusting /home/pmatos/Projects/cpython/Tools/scripts/pyvenv -> build/scripts-3.7
changing mode of build/scripts-3.7/pydoc3 from 664 to 775
changing mode of build/scripts-3.7/idle3 from 664 to 775
changing mode of build/scripts-3.7/2to3 from 664 to 775
changing mode of build/scripts-3.7/pyvenv from 664 to 775
renaming build/scripts-3.7/pydoc3 to build/scripts-3.7/pydoc3.7
renaming build/scripts-3.7/idle3 to build/scripts-3.7/idle3.7
renaming build/scripts-3.7/2to3 to build/scripts-3.7/2to3-3.7
renaming build/scripts-3.7/pyvenv to build/scripts-3.7/pyvenv-3.7
./python ../Tools/scripts/run_tests.py -v test_that_failed
/home/pmatos/Projects/cpython/debug/python -u -W default -bb -E -W error::BytesWarning -m test -r -w -j 0 -u all,-largefile,-audio,-gui -v test_that_failed
== CPython 3.7.0a0 (heads/master:48d9823a0e, Aug 14 2017, 11:53:56) [GCC 7.1.1 20170622 (Red Hat 7.1.1-3)]
== Linux-4.11.11-300.fc26.x86_64-x86_64-with-fedora-26-Twenty_Six little-endian
== hash algorithm: siphash24 64bit
== cwd: /home/pmatos/Projects/cpython/debug/build/test_python_22582
== CPU count: 16
== encodings: locale=UTF-8, FS=utf-8
Testing with flags: sys.flags(debug=0, inspect=0, interactive=0, optimize=0, dont_write_bytecode=0, no_user_site=0, no_site=0, ignore_environment=1, verbose=0, bytes_warning=2, quiet=0, hash_randomization=1, isolated=0)
Using random seed 8085058
Run tests in parallel using 18 child processes
0:00:00 load avg: 15.90 [1/1/1] test_that_failed failed
test test_that_failed crashed -- Traceback (most recent call last):
 File "/home/pmatos/Projects/cpython/Lib/test/libregrtest/runtest.py", line 163, in runtest_inner
 the_module = importlib.import_module(abstest)
 File "/home/pmatos/Projects/cpython/Lib/importlib/__init__.py", line 127, in import_module
 return _bootstrap._gcd_import(name[level:], package, level)
 File "<frozen importlib._bootstrap>", line 994, in _gcd_import
 File "<frozen importlib._bootstrap>", line 971, in _find_and_load
 File "<frozen importlib._bootstrap>", line 953, in _find_and_load_unlocked
ModuleNotFoundError: No module named 'test.test_that_failed'
1 test failed:
 test_that_failed
Re-running failed tests in verbose mode
Re-running test 'test_that_failed' in verbose mode
test test_that_failed crashed -- Traceback (most recent call last):
 File "/home/pmatos/Projects/cpython/Lib/test/libregrtest/runtest.py", line 163, in runtest_inner
 the_module = importlib.import_module(abstest)
 File "/home/pmatos/Projects/cpython/Lib/importlib/__init__.py", line 127, in import_module
 return _bootstrap._gcd_import(name[level:], package, level)
 File "<frozen importlib._bootstrap>", line 994, in _gcd_import
 File "<frozen importlib._bootstrap>", line 971, in _find_and_load
 File "<frozen importlib._bootstrap>", line 953, in _find_and_load_unlocked
ModuleNotFoundError: No module named 'test.test_that_failed'
1 test failed again:
 test_that_failed
Total duration: 355 ms
Tests result: FAILURE
make: *** [Makefile:1019: test] Error 2

Replace "test_that_failed" with the name of the test that failed.
The README could be improved by saying:
If any tests fail, you can re-run the failing test(s) in verbose mode. For example if, 'test_os' and 'test_gdb' failed, you can run::
 make test TESTOPTS="-v test_os test_gdb"

Argh, apologies David. I hadn't noticed the mistake. I simply copy/pasted and was expecting the command line to rerun all the tests that had previously failed. I was assuming the suite had some kind of state that recorded the tests that previously failed and ran only those. :)

Yep, I figured that. That's why I suggested the clarification to the README, if someone wants to generate a PR for it.

New changeset 0f914b5b5f6ba186afd7112fc851c97247076f70 by Ned Deily (Aaron Ang) in branch 'master':
bpo-31201: Clarify command to re-run failing test(s) with example (GH-6417)
https://github.com/python/cpython/commit/0f914b5b5f6ba186afd7112fc851c97247076f70

New changeset 71a3837bf39580ffa828c14247230a9277b9d5b1 by Ned Deily (Miss Islington (bot)) in branch '3.7':
[3.7] bpo-31201: Clarify command to re-run failing test(s) with example (GH-6417) (GH-6437)
https://github.com/python/cpython/commit/71a3837bf39580ffa828c14247230a9277b9d5b1

New changeset 83bb39907ec3828aec6d99bb9338283bd6b30ac2 by Ned Deily (Miss Islington (bot)) in branch '3.6':
[3.6] bpo-31201: Clarify command to re-run failing test(s) with example (GH-6417) (GH-6438)
https://github.com/python/cpython/commit/83bb39907ec3828aec6d99bb9338283bd6b30ac2

Thanks for the PR, Aaron!