Tests fail to find qiskit._accelerate when run through PyTest

[yurivict]

Environment

• Qiskit Terra version: 2bab09c1a
• Python version: 3.9
• Operating system: FreeBSD 13.1

What is happening?

ImportError while importing test module '/disk-samsung/freebsd-ports/science/py-qiskit-terra/work-py39/qiskit-terra-0.21.0rc1-58-g2bab09c1a/test/python/opflow/test_matrix_expectation.py'.
Hint: make sure your test modules/packages have valid Python names.
Traceback:
/usr/local/lib/python3.9/importlib/__init__.py:127: in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
test/__init__.py:16: in <module>
    from qiskit.test.utils import generate_cases
qiskit/__init__.py:21: in <module>
    import qiskit._accelerate
E   ModuleNotFoundError: No module named 'qiskit._accelerate'

How can we reproduce the issue?

Run through PyTest.

What should happen?

n/a

Any suggestions?

Same test .py files run fine separately.