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pytest-warns-without-warning (PT029)

Preview (since 0.9.2) · Related issues · View source

Derived from the flake8-pytest-style linter.

This rule is unstable and in preview. The --preview flag is required for use.

What it does

Checks for pytest.warns calls without an expected warning.

Why is this bad?

pytest.warns expects to receive an expected warning as its first argument. If omitted, the pytest.warns call will fail at runtime.

Example

import pytest


def test_foo():
    with pytest.warns():
        do_something()

Use instead:

import pytest


def test_foo():
    with pytest.warns(SomeWarning):
        do_something()

References