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How to fix pytest ERROR while parsing the following warning configuration: ...

Problem:

You want to ignore a warning during a unit test using code such as

pytest_filterwarnings.py
@pytest.mark.filterwarnings("divide by zero encountered in log10")
def test_auto_suffix_1d(self):
  # ...

but you see an error message such as

pytest_error.txt
ERROR: while parsing the following warning configuration:

  divide by zero encountered in log10

This error occurred:

invalid action: 'divide by zero encountered in log10'

Solution

In the argument to @pytest.mark.filterwarnings(...) you forgot the ignore: prefix:

Instead of

pytest_filterwarnings_fixed.py
@pytest.mark.filterwarnings("divide by zero encountered in log10")

write

example.py
@pytest.mark.filterwarnings("ignore: divide by zero encountered in log10")

You may see an error like:

pytest_error_output.txt
INTERNALERROR> while parsing the following warning:
INTERNALERROR> configuration

Often the cause is an invalid pytest.ini or pyproject.toml configuration. Example pytest.ini:

pytest.ini
[pytest]
addopts = -ra -q
python_files = tests.py test_*.py *_test.py

Validate your config and remove invalid options to fix the error.

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