test: Astra - add unit tests

[anakin87]

Related Issues

• part of https://github.com/deepset-ai/haystack-private/issues/275

Proposed Changes:

• add unit tests for arcadedb, focusing on uncovered code paths (with some AI help)
• simplify/parametrize some existing tests

How did you test it?

CI

Checklist

• I have read the contributors guidelines and the code of conduct
• I have updated the related issue with new insights and changes
• I added unit tests and updated the docstrings
• I've used one of the conventional commit types for my PR title: fix:, feat:, build:, chore:, ci:, docs:, style:, refactor:, perf:, test:.

[github-actions]

Coverage report (astra)

Click to see where and how coverage changed

File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
integrations/astra/src/haystack_integrations/components/retrievers/astra
retriever.py
integrations/astra/src/haystack_integrations/document_stores/astra
astra_client.py
document_store.py
filters.py
Project Total

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