bytes parametrize values aren't properly escaped #4458
Description
Problem
Parametrize values of type byte don't properly escape non-printable characters leading to inability to select those specific tests with -k.
Minimal example
test_select.py:
import pytest
@pytest.mark.parametrize('p', [b'\x01a', b'b'])
def test_a(p):
pass~$ pytest --collect-only --quiet
test_select.py::test_a[a]
test_select.py::test_a[b]
no tests ran in 0.04 seconds~$ pytest -k 'test_a[a]'
======================================== test session starts ========================================
platform darwin -- Python 3.6.6, pytest-4.0.0, py-1.7.0, pluggy-0.8.0
rootdir: /Users/ulo/Envs/tmp-54dcc18e560d86f8/pytest-select, inifile:
collected 2 items / 2 deselected
=================================== 2 deselected in 0.01 seconds ====================================