Add compatitibility with pytest 7

[sloretz]

fixes #590

This adds a new function _pytest_version_ge to make the hooks compatible with multiple versions of pytest. I tested that rclpy and launch_testing's tests passed on my system with pytest versions 4.6.9, 5.4, 6.0, and 7.0.

In short, pytest deprecated the uses of their LocalPath class in favor of pathlib.Path.

Tested using commands like:

pip3 install pytest==5.4 && colcon test --event-handlers console_direct+ --packages-select rclpy

[clalancette]

This looks like a good solution to me. Approved with green CI on Focal Linux, Jammy Linux, and Windows.

[Blast545]

LGTM

[sloretz]

CI (build: --packages-above-and-dependencies launch_testing test: --packages-above launch_testing)

• Linux
• Linux-aarch64
• Windows
• Linux Jammy

[sloretz]

@clalancette I see 16 warnings and 1 test failure in sros2 on Jammy, but none of them seem related to this PR. Do you know of a job with the current state of Jammy that I can compare this CI run to?

[clalancette]

@clalancette I see 16 warnings and 1 test failure in sros2 on Jammy, but none of them seem related to this PR. Do you know of a job with the current state of Jammy that I can compare this CI run to?

Those are all expected as of right now. The 16 warnings are from use of older OpenSSL APIs in Fast-DDS (I need to open an issue for that). The failing mypy test should be fixed by ros2/ci#617 (I still need to do a bit more testing there).

So this looks good to merge to me!

[sloretz]

@Mergifyio backport foxy galactic

[mergify]

backport foxy galactic

✅ Backports have been created

• #628 Add compatitibility with pytest 7 (backport #592) has been created for branch foxy
• #629 Add compatitibility with pytest 7 (backport #592) has been created for branch galactic

[mergify]

backport foxy galactic

✅ Backports have been created

• #628 Add compatitibility with pytest 7 (backport #592) has been created for branch foxy
• #629 Add compatitibility with pytest 7 (backport #592) has been created for branch galactic