Add test for https://gitlab.com/linkahead/linkahead-pylib/-/issues/89

Summary

Test for https://gitlab.com/linkahead/linkahead-pylib/-/issues/89
Code MR is here.

Check List for the Author

• Reference related issues
• Up-to-date CHANGELOG.md
• Appropriate user and developer documentation (or not necessary)
• Annotations in code (Gitlab comments)

Check List for the Reviewer

• I understand the intent of this MR
• All automated tests pass
• Up-to-date CHANGELOG.md (or not necessary)
• Appropriate user and developer documentation (or not necessary)
• The test environment setup works and the intended behavior is reproducible in the test environment
• In-code documentation and comments are up-to-date.
• Check: Are there specifications? Are they satisfied?

assigned to @i.nueske

mentioned in merge request caosdb-pylib!161 (merged)

marked the checklist item Annotations in code (Gitlab comments) as completed

changed the description

requested review from @florian

added 1 commit

• 4328bc6a - TST: Use RT with non-internal id

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added 1 commit

• bd830295 - TST: Extend to/from_xml consistency checks

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resolved all threads

marked the checklist item I understand the intent of this MR as completed

marked the checklist item All automated tests pass as completed

marked the checklist item Up-to-date CHANGELOG.md (or not necessary) as completed

marked the checklist item Appropriate user and developer documentation (or not necessary) as completed

marked the checklist item The test environment setup works and the intended behavior is reproducible in the test as completed

marked the checklist item In-code documentation and comments are up-to-date. as completed

enabled an automatic merge when all merge checks for bd830295 pass

mentioned in commit ff08db61

merged