test(backend): add unit coverage for mutation-testing helpers, rollout strategies, and tracing utilities - #1200
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…t strategies, and tracing utilities Co-authored-by: kilo
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Summary
Adds co-located unit tests for four modules that previously had no test coverage:
mutation-testing.helpers.ts — , , , , , , , and the map. Edge cases include empty transition arrays, terminal/boundary states, and invalid self-loops.
rollout-strategy.service.ts — (boundaries 0, 100, out-of-range ), at exact (>=) and (>) boundaries, and for both healthy-switch and unhealthy-no-switch paths.
rollout-strategy.ts (cache logic within ) — cache-hit/miss behavior, TTL expiry, eviction, and with and without a specific .
tracing.ts — , , (including null/undefined/empty/malformed inputs), success/error paths, exception event attributes, and correlation-ID generation when no incoming ID is present.
Changes
apps/backend/src/services/mutation-testing.helpers.test.ts(new)apps/backend/src/services/rollout-strategy.service.test.ts(new)apps/backend/src/services/rollout-strategy.test.ts(new)apps/backend/src/lib/tracing.test.ts(new)Issues
Closes #1079
Closes #1080
Closes #1081
Closes #1082