f move test

Summary

See #51 (closed) - The unittest test_data_model.py -> test_get_existing_entities was moved to integration tests because it needs to communicate with a server.

Focus

The test was copied and pasted

Test Environment

pytest

Check List for the Author

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• All automated tests pass
• Reference related Issues
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• 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
• 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 spezifications? Are they satisfied?

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