Add unit tests for terraform setup function in provider config

[erhancagirici]

In order to catch issues similar to #1221, provider config logic unit tests should be added.

[github-actions]

This provider repo does not have enough maintainers to address every issue. Since there has been no activity in the last 90 days it is now marked as stale. It will be closed in 14 days if no further activity occurs. Leaving a comment starting with /fresh will mark this issue as not stale.

[github-actions]

This issue is being closed since there has been no activity for 14 days since marking it as stale. If you still need help, feel free to comment or reopen the issue!