consider using a test framework

[FaragElsayed2]

Expected Behavior

Tests should be using python testing best practices.

One popular framework is pytest: https://docs.pytest.org/en/7.2.x/ as it comes with:

• automated test discovery
• and a rich ecosystem of plugins: https://docs.pytest.org/en/7.2.x/reference/plugin_list.html#plugin-list (including things like https://pypi.org/project/pytest-xdist/ that allow multiple tests to be run concurrently).

Actual Behavior

Tests uses monolytics python scripts with manual exit() invocation, see https://github.com/google/globalfoundries-pdk-libs-gf180mcu_fd_pr/blob/main/rules/klayout/drc/testing/run_regression.py#L243

Refer to https://github.com/google/globalfoundries-pdk-libs-gf180mcu_fd_pr/issues/79