[CI] Mutation Testing failing on main: backend and ai-engine

[anchapin]

Description

Mutation testing jobs are failing on main branch for both backend and ai-engine projects. This is a pre-existing issue not caused by recent PRs.

Failing Jobs

• Workflow: CI - Integration Tests (Optimized)
• Jobs:
  • Mutation Testing - Python (backend) - Run ID 66168591261
  • Mutation Testing - Python (ai-engine) - Run ID 66168591262
• Example Run: https://github.com/anchapin/ModPorter-AI/actions/runs/22811269353

Expected Behavior

Mutation tests should pass (or be skipped if intentionally disabled) on the main branch.

Actual Behavior

Both mutation testing jobs fail:

• step fails in backend
• step fails in ai-engine

Possible Causes

1. structlog dependency missing: Recent PRs (fix: CI Mutation Testing structlog module (#738) #741) added structlog for CI debugging but may not have been applied consistently
2. Mutation testing thresholds too strict: The threshold for passing may be set too high
3. Test flakiness: Mutation testing can be inherently flaky depending on the test suite

Suggested Fix

1. Verify structlog is installed in the CI workflow for both backend and ai-engine
2. Consider adjusting mutation testing thresholds or making them non-blocking
3. If mutation testing is not critical, consider disabling it or making it optional

Tags

• ci
• testing
• backend
• ai-engine
• bug
• priority: medium

[traycerai]

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[anchapin]

Duplicate of #738 - same issue