Create new repo for test_utils

[busunkim96]

Libraries can no longer install test_utils from a shared library once they are in a split repo.

Create a new repository for test_utils, and modify noxfiles to install test_utils from the git repo directly.

[danoscarmike]

@busunkim96 I see that there is a repo created at: https://github.com/googleapis/python-test-utils. Is it the intention to put a common set of utilities in there so that we don't have them duplicated across every api repo?

[busunkim96]

@danoscarmike Yep! I temporarily copied the test_utils directory into every library that needs it, but it should ideally be installed from one place.

[tmatsuo]

How about to re-use https://github.com/GoogleCloudPlatform/python-repo-tools ?

[danoscarmike]

Thanks both. Are test_utils used outside of googleapis org?

[danoscarmike]

I was thinking the following as next steps:

• Merge files to python-test-utils master
• Update synthtool noxfile template
• Update each existing client’s noxfile (example: python-asset) to use the common repo
• Remove /test_utils sub-directory from each client repo

[plamut]

Can this be closed now?

I can see that the new test utils repo now exists (thanks!), and some of the libraries already used it. I also already opened PRs in BigQuery and PubSub to clean the test_utils directory, and tracked that in their respective repos.

There is probably a better chance that library maintainers will see this if we open cleanup tickets in the library repos directly?