Speed up parameterized tests which use Git

[akaihola]

This is done by using the new module-scoped Git repository fixture from Darkgraylib.

• Merge Tools for speeding up tests using Git darkgraylib#84
• Release Darkgraylib 2.1.0
• Bump required minimum version of Darkgraylib to 2.1.0

To get aggregate timings for parameterized tests:

pip install pytest-reportlog
pytest --report-log=pytest.log.json
python analyze_pytest_log.py

analyze_pytest_log.py

import json
from collections import defaultdict


def aggregate_test_durations(log_contents):
    """Aggregate durations of parameterized tests from pytest-reportlog output.

    Args:
        log_contents (str): The contents of the pytest-reportlog file

    Returns:
        dict: A dictionary mapping test names to their total duration

    """
    # Dictionary to store total durations for each base test name
    test_durations = defaultdict(float)

    # Process each line
    for line in log_contents.strip().split("\n"):
        try:
            report = json.loads(line)

            # Extract the base test name by removing the parameter portion
            full_nodeid = report["nodeid"]
            base_name = full_nodeid.split("[")[0]

            # Add the duration to the total for this test
            test_durations[base_name] += report["duration"]

        except (json.JSONDecodeError, KeyError, IndexError) as e:
            print(f"Error processing line: {e} in {line}")
            continue

    return dict(test_durations)

def main():
    # Sample usage
    log_contents = open("pytest.log.json").read()

    results = aggregate_test_durations(log_contents)

    # Print results in a formatted way
    print("\nAggregated test durations:")
    print("-" * 50)
    by_duration = sorted(results.items(), key=lambda x: x[1], reverse=True)
    for test_name, duration in by_duration:
        print(f"{test_name:<40} {duration:.6f} seconds")

if __name__ == "__main__":
    main()

[akaihola]

Hi @DeinAlptraum & @clintonsteiner, Happy New Year! Are you interested to review how the speed of Darker unit tests on Windows almost doubled?

The amount of changes is quite large, and unfortunately the readability of tests suffered a bit (in my opinion), but now it's making way fewer Git subprocess calls (which are very expensive on Windows).

[DeinAlptraum]

Happy new year!
LGTM, but can't guarantee I didn't miss anything among the large number of changes