chore: Suppress insufficient coverage pytest warning

[webknjaz]

This is emitted by pytest-cov [1] and is turned into an error by the default -Werror passed to Python, not the filterwarnings setting within the pytest.

The patch selectively suppresses the warning so there's nothing to turn into an error in the first place. Insufficient coverage still marks the test session as failed as it's supposed to.

Description of your changes

$sbj. This is a workaround for a pytest-cov imperfection.

How can we test changes

tox -qq -- tests/pytest/_cli_test.py::test_app_exit -qq should not show a traceback.

Summary by CodeRabbit

• Chores
  • Updated test configuration to suppress specific coverage-related warnings during test runs.

[coderabbitai]

Walkthrough

The pull request modifies the tox.ini configuration file by adding a command line option to suppress specific warnings related to coverage failures during test execution. The change introduces a new warning suppression flag -W 'ignore:Coverage failure::pytest_cov.plugin' in the commands section of the [testenv] environment, which allows more controlled handling of pytest-cov plugin warnings without changing the core testing infrastructure.

Changes

File	Change Summary
tox.ini	Added warning suppression flag to ignore coverage failure warnings from pytest-cov plugin

The changes are minimal and focused on improving test run warning management by selectively suppressing specific coverage-related warnings during test execution.

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📜 Recent review details

Configuration used: CodeRabbit UI
Review profile: CHILL
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 4b0ad90 and 2b8a910.

📒 Files selected for processing (1)

• tox.ini (1 hunks)

⏰ Context from checks skipped due to timeout of 90000ms (9)

• GitHub Check: 🧪 Tests / pytest@🐍3.9@windows-2025
• GitHub Check: 🧪 Tests / pytest@🐍3.13@windows-2025
• GitHub Check: 🧪 Tests / pytest@🐍3.13@macos-13
• GitHub Check: 🧪 Tests / pytest@🐍3.12@windows-2025
• GitHub Check: 🧪 Tests / pytest@🐍3.11@windows-2025
• GitHub Check: 🧪 Tests / pytest@🐍3.10@windows-2025
• GitHub Check: 🧪 Tests / pytest@🐍3.10@macos-13
• GitHub Check: 🧪 Tests / pytest@🐍3.10@macos-14
• GitHub Check: pre-commit

🔇 Additional comments (2)

tox.ini (2)

26-26: LGTM! Warning suppression is correctly implemented.

The warning suppression pattern -W 'ignore:Coverage failure::pytest_cov.plugin' is:

1. Correctly placed before the pytest command
2. Properly scoped to only suppress coverage failure warnings from pytest-cov
3. Won't affect other warnings due to specific targeting
4. Still allows the test session to fail on insufficient coverage

This change effectively addresses the PR objective of suppressing the warning while maintaining the core functionality.

---

Line range hint 19-29: Verify integration with existing warning flags.

The warning suppression is added in a sequence with other Python CLI options:

• byte-errors
• max-isolation
• warnings-to-errors

Please ensure that the order of these flags doesn't affect the warning suppression behavior.

Run this script to verify the warning handling:

✅ Verification successful

Warning flag order is correctly implemented

The warning suppression is correctly ordered in relation to other Python CLI options:

• General warning flags (byte-errors, warnings-to-errors) are applied first
• The specific warning suppression comes last, ensuring it takes precedence over the general flags
• This ordering is consistently maintained throughout tox.ini

🏁 Scripts executed

The following scripts were executed for the analysis:

Script:

#!/bin/bash
# Description: Verify that the warning suppression works with existing flags
# Expected: The command should execute without displaying coverage warning traceback

# Test 1: Run with the specific test mentioned in PR description
tox -qq -- tests/pytest/_cli_test.py::test_app_exit -qq

# Test 2: Check if warnings are properly handled
python -Werror \
  -W 'ignore:Coverage failure::pytest_cov.plugin' \
  -m pytest tests/pytest/_cli_test.py::test_app_exit \
  --cov

Length of output: 313

---

Script:

#!/bin/bash
# Search for similar warning suppressions and warning flag usage
echo "=== Warning suppressions in Python files ==="
rg "-W.*ignore.*Coverage" -A 2 -B 2

echo -e "\n=== Warning-related test files ==="
fd "warn" -t f

echo -e "\n=== Warning configurations in INI files ==="
fd "\.ini$" --exec cat {}

echo -e "\n=== Check README for warning documentation ==="
fd "README" -t f --exec cat {}

Length of output: 83062

---

Script:

#!/bin/bash
# Search for warning-related configurations in pytest section
echo "=== Warning configurations in pytest section ==="
rg "filterwarnings|warnings" -A 2 -B 2 tox.ini

Length of output: 2419

---

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[MaxymVlasov]

Thank you, this one is much better

than it was