Unable to configure pdoc3 to ignore tests directory

I want pdoc3 to skip everything in my project's the tests directory, but even after reading #99 I am unable to get it to do so. Steps taken:

Create new directory mwe and cd into it.
Create ./main.py with:

"""Main program."""

def main(): pass

Create ./tests directory.
Create ./tests/test.py with:

"""Test code."""

def test(): pass

Run pdoc --force --html . to generate docs:

$ tree --charset unicode html
html
`-- mwe
    |-- index.html
    |-- main.html
    `-- tests
        |-- index.html
        `-- test.html

Add an file ./tests/__init__.py, re-run pdoc --force --html ., get error message:

/Users/gvwilson/miniforge3/lib/python3.9/site-packages/pdoc/__init__.py:239: UserWarning: Couldn't read PEP-224 variable docstrings from <Module 'mwe.tests'>: could not get source code
  warn("Couldn't read PEP-224 variable docstrings from {!r}: {}".format(doc_obj, exc))

Add this to ./tests/__init__.py

__pdoc__ = {
    'tests': False
}

produces a different error message:

/Users/gvwilson/miniforge3/lib/python3.9/site-packages/pdoc/__init__.py:706: UserWarning: __pdoc__-overriden key 'tests' does not exist in module 'mwe.tests'
  warn('__pdoc__-overriden key {!r} does not exist '

Creating an __init__.py file in the project's root directory with this content produces the same error message:

__pdoc__ = {
    'tests': False
}

Modify ./__init__.py to contain mwe.tests as shown below also produces this error message:

__pdoc__ = {
    'mwe.tests': False
}

I'd be grateful for the correct incantation (or if one doesn't exist, I'd be happy to PR a --ignore dir [dir] option).

pdoc3 / pdoc

Unable to configure pdoc3 to ignore tests directory #368