BLACKTestCase.test_should_read_options_from_pyproject_toml failing in 758c1ab

[sten0]

With Python 3.10, Emacs 27.1, and Black 21.12b0 and Elpy 758c1ab

=================================== FAILURES ===================================
__________ BLACKTestCase.test_should_read_options_from_pyproject_toml __________

self = <elpy.tests.test_black.BLACKTestCase testMethod=test_should_read_options_from_pyproject_toml>

    def test_should_read_options_from_pyproject_toml(self):
        with open('pyproject.toml', 'w') as f:
            f.write('[tool.black]\nline-length = 10')

        self.addCleanup(os.remove, 'pyproject.toml')

        testdata = [('x=       123\n', 'x = 123\n'),
                    ('x=1; \ny=2 \n', 'x = 1\ny = 2\n'),
                    ('x, y, z, a, b, c = 123, 124, 125, 126, 127, 128',
                     '(\n    x,\n    y,\n    z,\n    a,\n    b,\n    c,\n)'
                     ' = (\n    123,\n    124,\n    125,'
                     '\n    126,\n    127,\n    128,\n)\n')]
        for src, expected in testdata:
>           self._assert_format(src, expected)

elpy/tests/test_black.py:64:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
elpy/tests/test_black.py:49: in _assert_format
    self.assertEqual(new_block, expected)
E   AssertionError: 'x, y, z, a, b, c = 123, 124, 125, 126, 127, 128\n' != '(\n    x,\n    y,\n    z,\n    a,\n    b,[76 chars]n)\n'
E   - x, y, z, a, b, c = 123, 124, 125, 126, 127, 128
E   + (
E   +     x,
E   +     y,
E   +     z,
E   +     a,
E   +     b,
E   +     c,
E   + ) = (
E   +     123,
E   +     124,
E   +     125,
E   +     126,
E   +     127,
E   +     128,
E   + )
=============================== warnings summary ===============================
../../../../../../usr/lib/python3/dist-packages/yapf/yapflib/errors.py:16
  /usr/lib/python3/dist-packages/yapf/yapflib/errors.py:16: PendingDeprecationWarning: lib2to3 package is deprecated and may not be able to parse Python 3.10+
    from lib2to3.pgen2 import tokenize

-- Docs: https://docs.pytest.org/en/stable/warnings.html
=========================== short test summary info ============================
FAILED elpy/tests/test_black.py::BLACKTestCase::test_should_read_options_from_pyproject_toml

[sten0]

Oh, and this is a regression relative to 4248dcce