QA Results: Personalization Correctness Verification

Overall Verdict: PASS

All QA plan steps executed successfully.

Step 1: New test suite

cargo test --manifest-path tidal/Cargo.toml --test pg1_personalization_correctness -- --nocapture

running 16 tests
test dimension_mismatch_is_noop ... ok
test adaptive_learning_rate_decays ... ok
test ema_matches_manual_computation ... ok
test one_hour_window_exact_count ... ok
test decay_score_zero_after_many_half_lives ... ok
test more_engagement_ranks_higher ... ok
test all_time_count_monotonic ... ok
test gate_below_threshold_excluded ... ok
test multi_event_decay_matches_analytical ... ok
test velocity_equals_count_over_duration ... ok
test single_event_decay_matches_analytical ... ok
test out_of_order_converges_to_in_order ... ok
test signal_immediately_visible_in_retrieve ... ok
test interaction_boost_is_additive ... ok
test no_nan_or_infinity_in_scores ... ok
test max_per_creator_enforced ... ok

test result: ok. 16 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.02s

Result: PASS -- 16/16 tests pass, 0 failures, execution time 0.02s.

Step 2: Lib regression check

cargo test --manifest-path tidal/Cargo.toml --lib

test result: ok. 1352 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 5.01s

Result: PASS -- 1352 lib tests pass, no regressions.

Step 3: Format and lint

cargo fmt --manifest-path tidal/Cargo.toml -- --check tidal/tests/pg1_personalization_correctness.rs

Result: PASS -- No formatting diffs in our test file. (Other files from unrelated features have pre-existing fmt issues.)

cargo clippy --manifest-path tidal/Cargo.toml --test pg1_personalization_correctness -- -D warnings

Result: PASS -- No clippy warnings from pg1_personalization_correctness.rs. (Pre-existing warnings exist in other lib source files from unrelated features.)

Step 4: Non-trivial assertion review

Check	Verified
Decay tests use different timestamps (1s intervals) and varied weights (0.5 to 5.0)	YES
Multi-event test uses 10 events with non-uniform weights	YES
Out-of-order test shuffles chronological vs reverse order	YES
Score ordering uses 20 vs 5 views (4x difference)	YES
Reactivity test measures wall-clock with `Instant::now()` and asserts < 100ms	YES
Gate test has items at 10, 3, and 5 views (above/below/at boundary)	YES
NaN/Inf test includes edge cases: zero signals, 1e15 weight, 1e-15 weight	YES
Diversity test uses 5 creators x 5 items with graduated engagement	YES

Result: PASS -- All assertions are non-trivial and exercise meaningful variation.

QA Checklist

#	Check	Expected	Actual	Status
1	pg1_personalization_correctness tests all pass	0 failures	0 failures	PASS
2	Lib tests pass (no regression)	1352	1352	PASS
3	`cargo fmt --check` clean for test file	No diffs	No diffs	PASS
4	`cargo clippy --tests` clean for test file	No warnings	No warnings	PASS
5	Decay tests use varied inputs	Confirmed	Confirmed	PASS
6	Ordering tests compare different signal profiles	Confirmed	Confirmed	PASS
7	Reactivity tests include timing assertions	Confirmed	Confirmed	PASS

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