Simplify tests (backport #849)

[mergify]

This is an automatic backport of pull request #849 done by Mergify.
Cherry-pick of b28a870 has failed:

On branch mergify/bp/humble/pr-849
Your branch is up to date with 'origin/humble'.

You are currently cherry-picking commit b28a870.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	new file:   ur_robot_driver/test/test_common.py
	modified:   ur_robot_driver/test/urscript_interface.py

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   ur_robot_driver/test/dashboard_client.py
	both modified:   ur_robot_driver/test/robot_driver.py

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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