🧪 Add test for _clear_query_cache in simple_index

[madara88645]

🎯 What: The testing gap for _clear_query_cache in app/rag/simple_index.py is addressed by adding a dedicated unit test.
📊 Coverage: Tests the behavior of _clear_query_cache by simulating a populated cache and verifying it is emptied accurately.
✨ Result: Improved test coverage for app/rag/simple_index.py assuring cache invalidation logic is reliable.

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PR created automatically by Jules for task 4687676960465220275 started by @madara88645

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Project	Deployment	Actions	Updated (UTC)
compiler	Ready	Preview, Comment	May 30, 2026 4:11pm

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[cursor]

PR risk assessment (re-evaluated after update)

Risk level: Very Low

Evidence (diff-only, full PR vs main):

• Single file added: tests/test_rag_simple_index_cache.py (+16 lines)
• No production, config, infra, auth, or schema changes
• Tests existing _clear_query_cache() / cache helpers in app/rag/simple_index.py

Post-approval delta (3689377 → 848de7f): Removed unused pytest import only. Risk unchanged.

Blast radius: None on runtime behavior; adds regression coverage for in-process query cache clearing.

Code review: Not required for this risk tier.

Reviewers: None assigned (0 human/domain reviewers; under the 2-reviewer cap).

CODEOWNERS: No CODEOWNERS file in repo; no blocking owner review detected.

Decision: Prior approval remains valid — risk did not increase. Per policy, not re-approving on this run because the PR is already approved (approval on 3689377; head 848de7f).

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