F identifiable test

Summary

For https://gitlab.indiscale.com/caosdb/customers/leibniz-zmt/management/-/issues/60. Adds an integration test that tests whether a reference list of an existing record is updated correctly. It was meant as a test for the identifiable definitions in the real-world example but now also serves as a test for #12 (closed).

Focus

New integration test in test_real_world_example.py

Test Environment

Integration test should be sufficient. Remove the xfail to verify that the test fails as expected.

Check List for the Author

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• All automated tests pass
• Reference related issues
• Up-to-date CHANGELOG.md (or not necessary)
• Annotations in code (Gitlab comments)
  • Intent of new code
  • Problems with old code
  • Why this implementation?

Check List for the Reviewer

• I understand the intent of this MR
• All automated tests pass
• Up-to-date CHANGELOG.md (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?

For further good practices have a look at our review guidelines.